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pdfio/pdfio-content.c

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//
// Content helper functions for PDFio.
//
// Copyright © 2021-2023 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
//
// Include necessary headers...
//
#include "pdfio-private.h"
#include "pdfio-content.h"
#include "ttf.h"
#include <math.h>
#ifndef M_PI
# define M_PI 3.14159265358979323846264338327950288
#endif // M_PI
//
// Local constants...
//
#define _PDFIO_PNG_CHUNK_IDAT 0x49444154 // Image data
#define _PDFIO_PNG_CHUNK_IEND 0x49454e44 // Image end
#define _PDFIO_PNG_CHUNK_IHDR 0x49484452 // Image header
#define _PDFIO_PNG_CHUNK_PLTE 0x504c5445 // Palette
#define _PDFIO_PNG_CHUNK_cHRM 0x6348524d // Cromacities and white point
#define _PDFIO_PNG_CHUNK_gAMA 0x67414d41 // Gamma correction
#define _PDFIO_PNG_CHUNK_tRNS 0x74524e53 // Transparency information
#define _PDFIO_PNG_TYPE_GRAY 0 // Grayscale
#define _PDFIO_PNG_TYPE_RGB 2 // RGB
#define _PDFIO_PNG_TYPE_INDEXED 3 // Indexed
#define _PDFIO_PNG_TYPE_GRAYA 4 // Grayscale + alpha
#define _PDFIO_PNG_TYPE_RGBA 6 // RGB + alpha
static int _pdfio_cp1252[] = // CP1252-specific character mapping
{
0x20AC,
0x0000,
0x201A,
0x0192,
0x201E,
0x2026,
0x2020,
0x2021,
0x02C6,
0x2030,
0x0160,
0x2039,
0x0152,
0x0000,
0x017D,
0x0000,
0x0000,
0x2018,
0x2019,
0x201C,
0x201D,
0x2022,
0x2013,
0x2014,
0x02DC,
0x2122,
0x0161,
0x203A,
0x0153,
0x0000,
0x017E,
0x0178
};
//
// Local types...
//
typedef pdfio_obj_t *(*_pdfio_image_func_t)(pdfio_dict_t *dict, int fd);
//
// Local functions...
//
static pdfio_obj_t *copy_jpeg(pdfio_dict_t *dict, int fd);
static pdfio_obj_t *copy_png(pdfio_dict_t *dict, int fd);
static bool create_cp1252(pdfio_file_t *pdf);
static void ttf_error_cb(pdfio_file_t *pdf, const char *message);
static unsigned update_png_crc(unsigned crc, const unsigned char *buffer, size_t length);
static bool write_string(pdfio_stream_t *st, bool unicode, const char *s, bool *newline);
//
// Local globals...
//
static unsigned png_crc_table[256] = // CRC-32 table for PNG files
{
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
//
// 'pdfioArrayCreateColorFromICCObj()' - Create an ICC-based color space array.
//
pdfio_array_t * // O - Color array
pdfioArrayCreateColorFromICCObj(
pdfio_file_t *pdf, // I - PDF file
pdfio_obj_t *icc_object) // I - ICC profile object
{
pdfio_array_t *icc_color; // Color array
// Range check input...
if (!pdf || !icc_object)
return (NULL);
// Create the array with two values - a name and an object reference...
if ((icc_color = pdfioArrayCreate(pdf)) == NULL)
return (NULL);
pdfioArrayAppendName(icc_color, "ICCBased");
pdfioArrayAppendObj(icc_color, icc_object);
return (icc_color);
}
//
// 'pdfioArrayCreateColorFromMatrix()' - Create a calibrated color space array using a CIE XYZ transform matrix.
//
pdfio_array_t * // O - Color space array
pdfioArrayCreateColorFromMatrix(
pdfio_file_t *pdf, // I - PDF file
size_t num_colors, // I - Number of colors (1 or 3)
double gamma, // I - Gamma value
const double matrix[3][3], // I - XYZ transform
const double white_point[3]) // I - White point
{
size_t i; // Looping var
pdfio_array_t *calcolor; // Array to hold calibrated color space
pdfio_dict_t *dict; // Dictionary to hold color values
pdfio_array_t *value; // Value for white point, matrix, and gamma
// Range check input...
if (!pdf || (num_colors != 1 && num_colors != 3) || gamma <= 0.0)
return (NULL);
// Create the array with two values - a name and a dictionary...
if ((calcolor = pdfioArrayCreate(pdf)) == NULL)
return (NULL);
if (num_colors == 1)
pdfioArrayAppendName(calcolor, "CalGray");
else
pdfioArrayAppendName(calcolor, "CalRGB");
if ((dict = pdfioDictCreate(pdf)) == NULL)
return (NULL);
pdfioArrayAppendDict(calcolor, dict);
// Then add the values...
if (num_colors == 1)
{
pdfioDictSetNumber(dict, "Gamma", gamma);
}
else
{
if ((value = pdfioArrayCreate(pdf)) == NULL)
return (NULL);
for (i = 0; i < num_colors; i ++)
pdfioArrayAppendNumber(value, gamma);
pdfioDictSetArray(dict, "Gamma", value);
}
if (white_point)
{
if ((value = pdfioArrayCreate(pdf)) == NULL)
return (NULL);
pdfioArrayAppendNumber(value, white_point[0]);
pdfioArrayAppendNumber(value, white_point[1]);
pdfioArrayAppendNumber(value, white_point[2]);
pdfioDictSetArray(dict, "WhitePoint", value);
}
if (num_colors > 1 && matrix)
{
if ((value = pdfioArrayCreate(pdf)) == NULL)
return (NULL);
pdfioArrayAppendNumber(value, matrix[0][0]);
pdfioArrayAppendNumber(value, matrix[1][0]);
pdfioArrayAppendNumber(value, matrix[2][0]);
pdfioArrayAppendNumber(value, matrix[0][1]);
pdfioArrayAppendNumber(value, matrix[1][1]);
pdfioArrayAppendNumber(value, matrix[2][1]);
pdfioArrayAppendNumber(value, matrix[0][2]);
pdfioArrayAppendNumber(value, matrix[1][2]);
pdfioArrayAppendNumber(value, matrix[2][2]);
pdfioDictSetArray(dict, "Matrix", value);
}
return (calcolor);
}
//
// 'pdfioArrayCreateColorFromPalette()' - Create an indexed color space array.
//
pdfio_array_t * // O - Color array
pdfioArrayCreateColorFromPalette(
pdfio_file_t *pdf, // I - PDF file
size_t num_colors, // I - Number of colors
const unsigned char *colors) // I - RGB values for colors
{
pdfio_array_t *indexed_color; // Color array
// Range check input...
if (!pdf || num_colors < 1 || !colors)
return (NULL);
// Create the array with four values...
if ((indexed_color = pdfioArrayCreate(pdf)) == NULL)
return (NULL);
pdfioArrayAppendName(indexed_color, "Indexed");
pdfioArrayAppendName(indexed_color, "DeviceRGB");
pdfioArrayAppendNumber(indexed_color, num_colors - 1);
pdfioArrayAppendBinary(indexed_color, colors, num_colors * 3);
return (indexed_color);
}
//
// 'pdfioArrayCreateColorFromPrimaries()' - Create a calibrated color sapce array using CIE xy primary chromacities.
//
pdfio_array_t * // O - Color space array
pdfioArrayCreateColorFromPrimaries(
pdfio_file_t *pdf, // I - PDF file
size_t num_colors, // I - Number of colors (1 or 3)
double gamma, // I - Gama value
double wx, // I - White point X chromacity
double wy, // I - White point Y chromacity
double rx, // I - Red X chromacity
double ry, // I - Red Y chromacity
double gx, // I - Green X chromacity
double gy, // I - Green Y chromacity
double bx, // I - Blue X chromacity
double by) // I - Blue Y chromacity
{
double z; // Intermediate value
double Xa, Xb, Xc, // Transform values
Ya, Yb, Yc,
Za, Zb, Zc;
double white_point[3]; // White point CIE XYZ value
double matrix[3][3]; // CIE XYZ transform matrix
PDFIO_DEBUG("pdfioFileCreateCalibratedColorFromPrimaries(pdf=%p, num_colors=%lu, gamma=%g, wx=%g, wy=%g, rx=%g, ry=%g, gx=%g, gy=%g, bx=%g, by=%g)\n", pdf, (unsigned long)num_colors, gamma, wx, wy, rx, ry, gx, gy, bx, by);
// Range check input...
if (!pdf || (num_colors != 1 && num_colors != 3) || gamma <= 0.0 || ry == 0.0 || gy == 0.0 || by == 0.0)
return (NULL);
// Calculate the white point and transform matrix per the PDF spec...
z = wy * ((gx - bx) * ry - (rx - bx) * gy + (rx - gx) * by);
if (z == 0.0)
return (NULL); // Undefined
Ya = ry * ((gx - bx) * wy - (wx - bx) * gy + (wx - gx) * by) / z;
Xa = Ya * rx / ry;
Za = Ya * ((1.0 - rx) / ry - 1.0);
Yb = gy * ((rx - bx) * wy - (wx - bx) * ry + (wx - rx) * by) / z;
Xb = Yb * gx / gy;
Zb = Yb * ((1.0 - gx) / gy - 1.0);
Yc = gy * ((rx - gx) * wy - (wx - gx) * ry + (wx - rx) * gy) / z;
Xc = Yc * bx / by;
Zc = Yc * ((1.0 - bx) / by - 1.0);
white_point[0] = Xa + Xb + Xc;
white_point[1] = Ya + Yb + Yc;
white_point[2] = Za + Zb + Zc;
matrix[0][0] = Xa;
matrix[0][1] = Ya;
matrix[0][2] = Za;
matrix[1][0] = Xb;
matrix[1][1] = Yb;
matrix[1][2] = Zb;
matrix[2][0] = Xc;
matrix[2][1] = Yc;
matrix[2][2] = Zc;
PDFIO_DEBUG("pdfioFileCreateCalibratedColorFromPrimaries: white_point=[%g %g %g]\n", white_point[0], white_point[1], white_point[2]);
PDFIO_DEBUG("pdfioFileCreateCalibratedColorFromPrimaries: matrix=[%g %g %g %g %g %g %g %g %g]\n", matrix[0][0], matrix[1][0], matrix[2][0], matrix[0][1], matrix[1][1], matrix[2][2], matrix[0][2], matrix[1][2], matrix[2][1]);
// Now that we have the white point and matrix, use those to make the color array...
return (pdfioArrayCreateColorFromMatrix(pdf, num_colors, gamma, matrix, white_point));
}
//
// 'pdfioArrayCreateColorFromStandard()' - Create a color array for a standard color space.
//
// This function creates a color array for a standard `PDFIO_CS_` enumerated color space.
// The "num_colors" argument must be `1` for grayscale and `3` for RGB color.
//
pdfio_array_t * // O - Color array
pdfioArrayCreateColorFromStandard(
pdfio_file_t *pdf, // I - PDF file
size_t num_colors, // I - Number of colors (1 or 3)
pdfio_cs_t cs) // I - Color space enumeration
{
static const double adobe_matrix[3][3] = { { 0.57667, 0.18556, 0.18823 }, { 0.29734, 0.62736, 0.07529 }, { 0.02703, 0.07069, 0.99134 } };
static const double d65_white_point[3] = { 0.9505, 1.0, 1.0890 };
static const double p3_d65_matrix[3][3] = { { 0.48657, 0.26567, 0.19822 }, { 0.22897, 0.69174, 0.07929 }, { 0.00000, 0.04511, 1.04394 } };
static const double srgb_matrix[3][3] = { { 0.4124, 0.3576, 0.1805 }, { 0.2126, 0.7152, 0.0722 }, { 0.0193, 0.1192, 0.9505 } };
// Range check input...
if (!pdf)
{
return (NULL);
}
else if (num_colors != 1 && num_colors != 3)
{
_pdfioFileError(pdf, "Unsupported number of colors %u.", (unsigned)num_colors);
return (NULL);
}
switch (cs)
{
case PDFIO_CS_ADOBE :
return (pdfioArrayCreateColorFromMatrix(pdf, num_colors, 2.2, adobe_matrix, d65_white_point));
case PDFIO_CS_P3_D65 :
return (pdfioArrayCreateColorFromMatrix(pdf, num_colors, 2.2, p3_d65_matrix, d65_white_point));
case PDFIO_CS_SRGB :
return (pdfioArrayCreateColorFromMatrix(pdf, num_colors, 2.2, srgb_matrix, d65_white_point));
default :
_pdfioFileError(pdf, "Unsupported color space number %d.", (int)cs);
return (NULL);
}
}
//
// 'pdfioContentClip()' - Clip output to the current path.
//
bool // O - `true` on success, `false` on failure
pdfioContentClip(
pdfio_stream_t *st, // I - Stream
bool even_odd) // I - Even/odd fill vs. non-zero winding rule
{
return (pdfioStreamPuts(st, even_odd ? "W*\n" : "W\n"));
}
//
// 'pdfioContentDrawImage()' - Draw an image object.
//
// The object name must be part of the page dictionary resources, typically
// using the @link pdfioPageDictAddImage@ function.
//
bool // O - `true` on success, `false` on failure
pdfioContentDrawImage(
pdfio_stream_t *st, // I - Stream
const char *name, // I - Image name
double x, // I - X offset of image
double y, // I - Y offset of image
double width, // I - Width of image
double height) // I - Height of image
{
return (pdfioStreamPrintf(st, "q %g 0 0 %g %g %g cm/%s Do Q\n", width, height, x, y, name));
}
//
// 'pdfioContentFill()' - Fill the current path.
//
bool // O - `true` on success, `false` on failure
pdfioContentFill(
pdfio_stream_t *st, // I - Stream
bool even_odd) // I - Even/odd fill vs. non-zero winding rule
{
return (pdfioStreamPuts(st, even_odd ? "f*\n" : "f\n"));
}
//
// 'pdfioContentFillAndStroke()' - Fill and stroke the current path.
//
bool // O - `true` on success, `false` on failure
pdfioContentFillAndStroke(
pdfio_stream_t *st, // I - Stream
bool even_odd) // I - Even/odd fill vs. non-zero winding
{
return (pdfioStreamPuts(st, even_odd ? "B*\n" : "B\n"));
}
//
// 'pdfioContentMatrixConcat()' - Concatenate a matrix to the current graphics
// state.
//
bool // O - `true` on success, `false` on failure
pdfioContentMatrixConcat(
pdfio_stream_t *st, // I - Stream
pdfio_matrix_t m) // I - Transform matrix
{
return (pdfioStreamPrintf(st, "%g %g %g %g %g %g cm\n", m[0][0], m[0][1], m[1][0], m[1][1], m[2][0], m[2][1]));
}
//
// 'pdfioContentMatrixRotate()' - Rotate the current transform matrix.
//
bool // O - `true` on success, `false` on failure
pdfioContentMatrixRotate(
pdfio_stream_t *st, // I - Stream
double degrees) // I - Rotation angle in degrees counter-clockwise
{
double dcos = cos(M_PI * degrees / 180.0);
// Cosine
double dsin = sin(M_PI * degrees / 180.0);
// Sine
return (pdfioStreamPrintf(st, "%g %g %g %g 0 0 cm\n", dcos, -dsin, dsin, dcos));
}
//
// 'pdfioContentMatrixScale()' - Scale the current transform matrix.
//
bool // O - `true` on success, `false` on failure
pdfioContentMatrixScale(
pdfio_stream_t *st, // I - Stream
double sx, // I - X scale
double sy) // I - Y scale
{
return (pdfioStreamPrintf(st, "%g 0 0 %g 0 0 cm\n", sx, sy));
}
//
// 'pdfioContentMatrixTranslate()' - Translate the current transform matrix.
//
bool // O - `true` on success, `false` on failure
pdfioContentMatrixTranslate(
pdfio_stream_t *st, // I - Stream
double tx, // I - X offset
double ty) // I - Y offset
{
return (pdfioStreamPrintf(st, "1 0 0 1 %g %g cm\n", tx, ty));
}
//
// 'pdfioContentPathClose()' - Close the current path.
//
bool // O - `true` on success, `false` on failure
pdfioContentPathClose(
pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "h\n"));
}
//
// 'pdfioContentPathCurve()' - Add a Bezier curve with two control points.
//
bool // O - `true` on success, `false` on failure
pdfioContentPathCurve(
pdfio_stream_t *st, // I - Stream
double x1, // I - X position 1
double y1, // I - Y position 1
double x2, // I - X position 2
double y2, // I - Y position 2
double x3, // I - X position 3
double y3) // I - Y position 3
{
return (pdfioStreamPrintf(st, "%g %g %g %g %g %g c\n", x1, y1, x2, y2, x3, y3));
}
//
// 'pdfioContentPathCurve13()' - Add a Bezier curve with an initial control point.
//
bool // O - `true` on success, `false` on failure
pdfioContentPathCurve13(
pdfio_stream_t *st, // I - Stream
double x1, // I - X position 1
double y1, // I - Y position 1
double x3, // I - X position 3
double y3) // I - Y position 3
{
return (pdfioStreamPrintf(st, "%g %g %g %g v\n", x1, y1, x3, y3));
}
//
// 'pdfioContentPathCurve23()' - Add a Bezier curve with a trailing control point.
//
bool // O - `true` on success, `false` on failure
pdfioContentPathCurve23(
pdfio_stream_t *st, // I - Stream
double x2, // I - X position 2
double y2, // I - Y position 2
double x3, // I - X position 3
double y3) // I - Y position 3
{
return (pdfioStreamPrintf(st, "%g %g %g %g y\n", x2, y2, x3, y3));
}
//
// 'pdfioContentPathEnd()' - Clear the current path.
//
bool // O - `true` on success, `false` on failure
pdfioContentPathEnd(pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "n\n"));
}
//
// 'pdfioContentPathLineTo()' - Add a straight line to the current path.
//
bool // O - `true` on success, `false` on failure
pdfioContentPathLineTo(
pdfio_stream_t *st, // I - Stream
double x, // I - X position
double y) // I - Y position
{
return (pdfioStreamPrintf(st, "%g %g l\n", x, y));
}
//
// 'pdfioContentPathMoveTo()' - Start a new subpath.
//
bool // O - `true` on success, `false` on failure
pdfioContentPathMoveTo(
pdfio_stream_t *st, // I - Stream
double x, // I - X position
double y) // I - Y position
{
return (pdfioStreamPrintf(st, "%g %g m\n", x, y));
}
//
// 'pdfioContentPathRect()' - Add a rectangle to the current path.
//
bool // O - `true` on success, `false` on failure
pdfioContentPathRect(
pdfio_stream_t *st, // I - Stream
double x, // I - X offset
double y, // I - Y offset
double width, // I - Width
double height) // I - Height
{
return (pdfioStreamPrintf(st, "%g %g %g %g re\n", x, y, width, height));
}
//
// 'pdfioContentRestore()' - Restore a previous graphics state.
//
bool // O - `true` on success, `false` on failure
pdfioContentRestore(
pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "Q\n"));
}
//
// 'pdfioContentSave()' - Save the current graphics state.
//
bool // O - `true` on success, `false` on failure
pdfioContentSave(pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "q\n"));
}
//
// 'pdfioContentSetDashPattern()' - Set the stroke pattern.
//
// This function sets the stroke pattern when drawing lines. If "on" and "off"
// are 0, a solid line is drawn.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetDashPattern(
pdfio_stream_t *st, // I - Stream
double phase, // I - Phase (offset within pattern)
double on, // I - On length
double off) // I - Off length
{
if (on <= 0.0 && off <= 0.0)
return (pdfioStreamPrintf(st, "[] %g d\n", phase));
else if (fabs(on - off) < 0.001)
return (pdfioStreamPrintf(st, "[%g] %g d\n", on, phase));
else
return (pdfioStreamPrintf(st, "[%g %g] %g d\n", on, off, phase));
}
//
// 'pdfioContentSetFillColorDeviceCMYK()' - Set device CMYK fill color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetFillColorDeviceCMYK(
pdfio_stream_t *st, // I - Stream
double c, // I - Cyan value (0.0 to 1.0)
double m, // I - Magenta value (0.0 to 1.0)
double y, // I - Yellow value (0.0 to 1.0)
double k) // I - Black value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g %g %g %g k\n", c, m, y, k));
}
//
// 'pdfioContentSetFillColorDeviceGray()' - Set the device gray fill color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetFillColorDeviceGray(
pdfio_stream_t *st, // I - Stream
double g) // I - Gray value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g g\n", g));
}
//
// 'pdfioContentSetFillColorDeviceRGB()' - Set the device RGB fill color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetFillColorDeviceRGB(
pdfio_stream_t *st, // I - Stream
double r, // I - Red value (0.0 to 1.0)
double g, // I - Green value (0.0 to 1.0)
double b) // I - Blue value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g %g %g rg\n", r, g, b));
}
//
// 'pdfioContentSetFillColorGray()' - Set the calibrated gray fill color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetFillColorGray(
pdfio_stream_t *st, // I - Stream
double g) // I - Gray value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g sc\n", g));
}
//
// 'pdfioContentSetFillColorRGB()' - Set the calibrated RGB fill color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetFillColorRGB(
pdfio_stream_t *st, // I - Stream
double r, // I - Red value (0.0 to 1.0)
double g, // I - Green value (0.0 to 1.0)
double b) // I - Blue value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g %g %g sc\n", r, g, b));
}
//
// 'pdfioContentSetFillColorSpace()' - Set the fill colorspace.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetFillColorSpace(
pdfio_stream_t *st, // I - Stream
const char *name) // I - Color space name
{
return (pdfioStreamPrintf(st, "/%s cs\n", name));
}
//
// 'pdfioContentSetFlatness()' - Set the flatness tolerance.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetFlatness(
pdfio_stream_t *st, // I - Stream
double flatness) // I - Flatness value (0.0 to 100.0)
{
return (pdfioStreamPrintf(st, "%g i\n", flatness));
}
//
// 'pdfioContentSetLineCap()' - Set the line ends style.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetLineCap(
pdfio_stream_t *st, // I - Stream
pdfio_linecap_t lc) // I - Line cap value
{
return (pdfioStreamPrintf(st, "%d J\n", lc));
}
//
// 'pdfioContentSetLineJoin()' - Set the line joining style.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetLineJoin(
pdfio_stream_t *st, // I - Stream
pdfio_linejoin_t lj) // I - Line join value
{
return (pdfioStreamPrintf(st, "%d j\n", lj));
}
//
// 'pdfioContentSetLineWidth()' - Set the line width.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetLineWidth(
pdfio_stream_t *st, // I - Stream
double width) // I - Line width value
{
return (pdfioStreamPrintf(st, "%g w\n", width));
}
//
// 'pdfioContentSetMiterLimit()' - Set the miter limit.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetMiterLimit(
pdfio_stream_t *st, // I - Stream
double limit) // I - Miter limit value
{
return (pdfioStreamPrintf(st, "%g M\n", limit));
}
//
// 'pdfioContentSetStrokeColorDeviceCMYK()' - Set the device CMYK stroke color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetStrokeColorDeviceCMYK(
pdfio_stream_t *st, // I - Stream
double c, // I - Cyan value (0.0 to 1.0)
double m, // I - Magenta value (0.0 to 1.0)
double y, // I - Yellow value (0.0 to 1.0)
double k) // I - Black value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g %g %g %g K\n", c, m, y, k));
}
//
// 'pdfioContentSetStrokeColorDeviceGray()' - Set the device gray stroke color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetStrokeColorDeviceGray(
pdfio_stream_t *st, // I - Stream
double g) // I - Gray value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g G\n", g));
}
//
// 'pdfioContentSetStrokeColorDeviceRGB()' - Set the device RGB stroke color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetStrokeColorDeviceRGB(
pdfio_stream_t *st, // I - Stream
double r, // I - Red value (0.0 to 1.0)
double g, // I - Green value (0.0 to 1.0)
double b) // I - Blue value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g %g %g RG\n", r, g, b));
}
//
// 'pdfioContentSetStrokeColorGray()' - Set the calibrated gray stroke color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetStrokeColorGray(
pdfio_stream_t *st, // I - Stream
double g) // I - Gray value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g SC\n", g));
}
//
// 'pdfioContentSetStrokeColorRGB()' - Set the calibrated RGB stroke color.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetStrokeColorRGB(
pdfio_stream_t *st, // I - Stream
double r, // I - Red value (0.0 to 1.0)
double g, // I - Green value (0.0 to 1.0)
double b) // I - Blue value (0.0 to 1.0)
{
return (pdfioStreamPrintf(st, "%g %g %g SC\n", r, g, b));
}
//
// 'pdfioContentSetStrokeColorSpace()' - Set the stroke color space.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetStrokeColorSpace(
pdfio_stream_t *st, // I - Stream
const char *name) // I - Color space name
{
return (pdfioStreamPrintf(st, "/%s CS\n", name));
}
//
// 'pdfioContentSetTextCharacterSpacing()' - Set the spacing between characters.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetTextCharacterSpacing(
pdfio_stream_t *st, // I - Stream
double spacing) // I - Character spacing
{
return (pdfioStreamPrintf(st, "%g Tc\n", spacing));
}
//
// 'pdfioContentSetTextFont()' - Set the text font and size.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetTextFont(
pdfio_stream_t *st, // I - Stream
const char *name, // I - Font name
double size) // I - Font size
{
return (pdfioStreamPrintf(st, "/%s %g Tf\n", name, size));
}
//
// 'pdfioContentSetTextLeading()' - Set text leading (line height) value.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetTextLeading(
pdfio_stream_t *st, // I - Stream
double leading) // I - Leading (line height) value
{
return (pdfioStreamPrintf(st, "%g TL\n", leading));
}
//
// 'pdfioContentSetTextMatrix()' - Set the text transform matrix.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetTextMatrix(
pdfio_stream_t *st, // I - Stream
pdfio_matrix_t m) // I - Transform matrix
{
return (pdfioStreamPrintf(st, "%g %g %g %g %g %g Tm\n", m[0][0], m[0][1], m[1][0], m[1][1], m[2][0], m[2][1]));
}
//
// 'pdfioContentSetTextRenderingMode()' - Set the text rendering mode.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetTextRenderingMode(
pdfio_stream_t *st, // I - Stream
pdfio_textrendering_t mode) // I - Text rendering mode
{
return (pdfioStreamPrintf(st, "%d Tr\n", mode));
}
//
// 'pdfioContentSetTextRise()' - Set the text baseline offset.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetTextRise(
pdfio_stream_t *st, // I - Stream
double rise) // I - Y offset
{
return (pdfioStreamPrintf(st, "%g Ts\n", rise));
}
//
// 'pdfioContentSetTextWordSpacing()' - Set the inter-word spacing.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetTextWordSpacing(
pdfio_stream_t *st, // I - Stream
double spacing) // I - Spacing between words
{
return (pdfioStreamPrintf(st, "%g Tw\n", spacing));
}
//
// 'pdfioContentSetTextXScaling()' - Set the horizontal scaling value.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetTextXScaling(
pdfio_stream_t *st, // I - Stream
double percent) // I - Horizontal scaling in percent
{
return (pdfioStreamPrintf(st, "%g Tz\n", percent));
}
//
// 'pdfioContentStroke()' - Stroke the current path.
//
bool // O - `true` on success, `false` on failure
pdfioContentStroke(pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "S\n"));
}
//
// 'pdfioContentTextBegin()' - Begin a text block.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextBegin(
pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "BT\n"));
}
//
// 'pdfioContentTextEnd()' - End a text block.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextEnd(pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "ET\n"));
}
//
// 'pdfioContentTextMoveLine()' - Move to the next line and offset.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextMoveLine(
pdfio_stream_t *st, // I - Stream
double tx, // I - X offset
double ty) // I - Y offset
{
return (pdfioStreamPrintf(st, "%g %g TD\n", tx, ty));
}
//
// 'pdfioContentTextMoveTo()' - Offset within the current line.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextMoveTo(
pdfio_stream_t *st, // I - Stream
double tx, // I - X offset
double ty) // I - Y offset
{
return (pdfioStreamPrintf(st, "%g %g Td\n", tx, ty));
}
//
// 'pdfioContentTextNextLine()' - Move to the next line.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextNextLine(
pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "T*\n"));
}
//
// 'pdfioContentTextShow()' - Show text.
//
// This function shows some text in a PDF content stream. The "unicode" argument
// specifies that the current font maps to full Unicode. The "s" argument
// specifies a UTF-8 encoded string.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextShow(
pdfio_stream_t *st, // I - Stream
bool unicode, // I - Unicode text?
const char *s) // I - String to show
{
bool newline = false; // New line?
// Write the string...
if (!write_string(st, unicode, s, &newline))
return (false);
// Draw it...
if (newline)
return (pdfioStreamPuts(st, "Tj T*\n"));
else
return (pdfioStreamPuts(st, "Tj\n"));
}
//
// 'pdfioContentTextShowf()' - Show formatted text.
//
// This function shows some text in a PDF content stream. The "unicode" argument
// specifies that the current font maps to full Unicode. The "format" argument
// specifies a UTF-8 encoded `printf`-style format string.
//
bool
pdfioContentTextShowf(
pdfio_stream_t *st, // I - Stream
bool unicode, // I - Unicode text?
const char *format, // I - `printf`-style format string
...) // I - Additional arguments as needed
{
bool newline = false; // New line?
char buffer[8192]; // Text buffer
va_list ap; // Argument pointer
// Format the string...
va_start(ap, format);
vsnprintf(buffer, sizeof(buffer), format, ap);
va_end(ap);
// Write the string...
if (!write_string(st, unicode, buffer, &newline))
return (false);
// Draw it...
if (newline)
return (pdfioStreamPuts(st, "Tj T*\n"));
else
return (pdfioStreamPuts(st, "Tj\n"));
}
//
// 'pdfioContentTextShowJustified()' - Show justified text.
//
// This function shows some text in a PDF content stream. The "unicode" argument
// specifies that the current font maps to full Unicode. The "fragments"
// argument specifies an array of UTF-8 encoded strings.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextShowJustified(
pdfio_stream_t *st, // I - Stream
bool unicode, // I - Unicode text?
size_t num_fragments, // I - Number of text fragments
const double *offsets, // I - Text offsets before fragments
const char * const *fragments) // I - Text fragments
{
size_t i; // Looping var
// Write an array of offsets and string fragments...
if (!pdfioStreamPuts(st, "["))
return (false);
for (i = 0; i < num_fragments; i ++)
{
if (offsets[i] != 0.0f)
{
if (!pdfioStreamPrintf(st, "%g", offsets[i]))
return (false);
}
if (fragments[i])
{
if (!write_string(st, unicode, fragments[i], NULL))
return (false);
}
}
return (pdfioStreamPuts(st, "]TJ\n"));
}
//
// 'pdfioFileCreateBaseFontObj()' - Create one of the base 14 PDF fonts.
//
// This function creates one of the base 14 PDF fonts. The "name" parameter
// specifies the font nane:
//
// - "Courier"
// - "Courier-Bold"
// - "Courier-BoldItalic"
// - "Courier-Italic"
// - "Helvetica"
// - "Helvetica-Bold"
// - "Helvetica-BoldOblique"
// - "Helvetica-Oblique"
// - "Symbol"
// - "Times-Bold"
// - "Times-BoldItalic"
// - "Times-Italic"
// - "Times-Roman"
// - "ZapfDingbats"
//
// Base fonts always use the Windows CP1252 (ISO-8859-1 with additional
// characters such as the Euro symbol) subset of Unicode.
//
pdfio_obj_t * // O - Font object
pdfioFileCreateFontObjFromBase(
pdfio_file_t *pdf, // I - PDF file
const char *name) // I - Font name
{
pdfio_dict_t *dict; // Font dictionary
pdfio_obj_t *obj; // Font object
if ((dict = pdfioDictCreate(pdf)) == NULL)
return (NULL);
pdfioDictSetName(dict, "Type", "Font");
pdfioDictSetName(dict, "Subtype", "Type1");
pdfioDictSetName(dict, "BaseFont", pdfioStringCreate(pdf, name));
if (strcmp(name, "Symbol") && strcmp(name, "ZapfDingbats"))
{
if (!pdf->cp1252_obj && !create_cp1252(pdf))
return (NULL);
pdfioDictSetObj(dict, "Encoding", pdf->cp1252_obj);
}
if ((obj = pdfioFileCreateObj(dict->pdf, dict)) != NULL)
pdfioObjClose(obj);
return (obj);
}
//
// 'pdfioFileCreateFontObjFromFile()' - Add a font object to a PDF file.
//
// This function embeds a TrueType/OpenType font into a PDF file. The
// "unicode" parameter controls whether the font is encoded for two-byte
// characters (potentially full Unicode, but more typically a subset)
// or to only support the Windows CP1252 (ISO-8859-1 with additional
// characters such as the Euro symbol) subset of Unicode.
//
pdfio_obj_t * // O - Font object
pdfioFileCreateFontObjFromFile(
pdfio_file_t *pdf, // I - PDF file
const char *filename, // I - Filename
bool unicode) // I - Force Unicode
{
ttf_t *font; // TrueType font
ttf_rect_t bounds; // Font bounds
pdfio_dict_t *dict, // Font dictionary
*desc, // Font descriptor
*file; // Font file dictionary
pdfio_obj_t *obj, // Font object
*desc_obj, // Font descriptor object
*file_obj; // Font file object
const char *basefont; // Base font name
pdfio_array_t *bbox; // Font bounding box array
pdfio_stream_t *st; // Font stream
int fd; // File
unsigned char buffer[16384]; // Read buffer
ssize_t bytes; // Bytes read
// Range check input...
if (!pdf)
return (NULL);
if (!filename)
{
_pdfioFileError(pdf, "No TrueType/OpenType filename specified.");
return (NULL);
}
if ((fd = open(filename, O_RDONLY | O_BINARY)) < 0)
{
_pdfioFileError(pdf, "Unable to open font file '%s': %s", filename, strerror(errno));
return (NULL);
}
if ((font = ttfCreate(filename, 0, (ttf_err_cb_t)ttf_error_cb, pdf)) == NULL)
{
close(fd);
return (NULL);
}
// Create the font file dictionary and object...
if ((file = pdfioDictCreate(pdf)) == NULL)
{
ttfDelete(font);
close(fd);
return (NULL);
}
pdfioDictSetName(file, "Filter", "FlateDecode");
if ((file_obj = pdfioFileCreateObj(pdf, file)) == NULL)
{
ttfDelete(font);
close(fd);
return (NULL);
}
if ((st = pdfioObjCreateStream(file_obj, PDFIO_FILTER_FLATE)) == NULL)
{
ttfDelete(font);
close(fd);
return (NULL);
}
while ((bytes = read(fd, buffer, sizeof(buffer))) > 0)
{
if (!pdfioStreamWrite(st, buffer, (size_t)bytes))
{
ttfDelete(font);
close(fd);
pdfioStreamClose(st);
return (NULL);
}
}
close(fd);
pdfioStreamClose(st);
// Create the font descriptor dictionary and object...
if ((bbox = pdfioArrayCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
ttfGetBounds(font, &bounds);
pdfioArrayAppendNumber(bbox, bounds.left);
pdfioArrayAppendNumber(bbox, bounds.bottom);
pdfioArrayAppendNumber(bbox, bounds.right);
pdfioArrayAppendNumber(bbox, bounds.top);
if ((desc = pdfioDictCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
basefont = pdfioStringCreate(pdf, ttfGetPostScriptName(font));
pdfioDictSetName(desc, "Type", "FontDescriptor");
pdfioDictSetName(desc, "FontName", basefont);
pdfioDictSetObj(desc, "FontFile2", file_obj);
pdfioDictSetNumber(desc, "Flags", ttfIsFixedPitch(font) ? 0x21 : 0x20);
pdfioDictSetArray(desc, "FontBBox", bbox);
pdfioDictSetNumber(desc, "ItalicAngle", ttfGetItalicAngle(font));
pdfioDictSetNumber(desc, "Ascent", ttfGetAscent(font));
pdfioDictSetNumber(desc, "Descent", ttfGetDescent(font));
pdfioDictSetNumber(desc, "CapHeight", ttfGetCapHeight(font));
pdfioDictSetNumber(desc, "XHeight", ttfGetXHeight(font));
// Note: No TrueType value exists for this but PDF requires it, so we
// calculate a generic value from 50 to 250 based on the weight...
pdfioDictSetNumber(desc, "StemV", ttfGetWeight(font) / 4 + 25);
if ((desc_obj = pdfioFileCreateObj(pdf, desc)) == NULL)
{
ttfDelete(font);
return (NULL);
}
pdfioObjClose(desc_obj);
if (unicode)
{
// Unicode (CID) font...
pdfio_dict_t *cid2gid; // CIDToGIDMap dictionary
pdfio_obj_t *cid2gid_obj; // CIDToGIDMap object
size_t i, // Looping var
num_cmap; // Number of CMap entries
const int *cmap; // CMap entries
unsigned char *bufptr, // Pointer into buffer
*bufend; // End of buffer
pdfio_dict_t *type2; // CIDFontType2 font dictionary
pdfio_obj_t *type2_obj; // CIDFontType2 font object
pdfio_array_t *descendants; // Decendant font list
pdfio_dict_t *sidict; // CIDSystemInfo dictionary
// Create a CIDToGIDMap object for the Unicode font...
if ((cid2gid = pdfioDictCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
#ifndef DEBUG
pdfioDictSetName(cid2gid, "Filter", "FlateDecode");
#endif // !DEBUG
if ((cid2gid_obj = pdfioFileCreateObj(pdf, cid2gid)) == NULL)
{
ttfDelete(font);
return (NULL);
}
#ifdef DEBUG
if ((st = pdfioObjCreateStream(cid2gid_obj, PDFIO_FILTER_NONE)) == NULL)
#else
if ((st = pdfioObjCreateStream(cid2gid_obj, PDFIO_FILTER_FLATE)) == NULL)
#endif // DEBUG
{
ttfDelete(font);
return (NULL);
}
cmap = ttfGetCMap(font, &num_cmap);
for (i = 0, bufptr = buffer, bufend = buffer + sizeof(buffer); i < num_cmap; i ++)
{
if (cmap[i] < 0)
{
// Map undefined glyph to .notdef...
*bufptr++ = 0;
*bufptr++ = 0;
}
else
{
// Map to specified glyph...
*bufptr++ = (unsigned char)(cmap[i] >> 8);
*bufptr++ = (unsigned char)(cmap[i] & 255);
}
if (bufptr >= bufend)
{
// Flush buffer...
if (!pdfioStreamWrite(st, buffer, (size_t)(bufptr - buffer)))
{
pdfioStreamClose(st);
ttfDelete(font);
return (NULL);
}
bufptr = buffer;
}
}
if (bufptr > buffer)
{
// Flush buffer...
if (!pdfioStreamWrite(st, buffer, (size_t)(bufptr - buffer)))
{
pdfioStreamClose(st);
ttfDelete(font);
return (NULL);
}
}
pdfioStreamClose(st);
// Create a CIDFontType2 dictionary for the Unicode font...
if ((type2 = pdfioDictCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
if ((sidict = pdfioDictCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
// CIDSystemInfo mapping to Adobe UCS2 v0 (Unicode)
pdfioDictSetString(sidict, "Registry", "Adobe");
pdfioDictSetString(sidict, "Ordering", "Identity");
pdfioDictSetNumber(sidict, "Supplement", 0);
// Then the dictionary for the CID base font...
pdfioDictSetName(type2, "Type", "Font");
pdfioDictSetName(type2, "Subtype", "CIDFontType2");
pdfioDictSetName(type2, "BaseFont", basefont);
pdfioDictSetDict(type2, "CIDSystemInfo", sidict);
pdfioDictSetObj(type2, "CIDToGIDMap", cid2gid_obj);
pdfioDictSetObj(type2, "FontDescriptor", desc_obj);
if ((type2_obj = pdfioFileCreateObj(pdf, type2)) == NULL)
{
ttfDelete(font);
return (NULL);
}
pdfioObjClose(type2_obj);
// Create a Type 0 font object...
if ((descendants = pdfioArrayCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
pdfioArrayAppendObj(descendants, type2_obj);
if ((dict = pdfioDictCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
pdfioDictSetName(dict, "Type", "Font");
pdfioDictSetName(dict, "Subtype", "Type0");
pdfioDictSetName(dict, "BaseFont", basefont);
pdfioDictSetArray(dict, "DescendantFonts", descendants);
pdfioDictSetName(dict, "Encoding", "Identity-H");
if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
return (NULL);
pdfioObjClose(obj);
}
else
{
// Simple (CP1282 or custom encoding) 8-bit font...
if (ttfGetMaxChar(font) >= 255 && !pdf->cp1252_obj && !create_cp1252(pdf))
{
ttfDelete(font);
return (NULL);
}
// Create a TrueType font object...
if ((dict = pdfioDictCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
pdfioDictSetName(dict, "Type", "Font");
pdfioDictSetName(dict, "Subtype", "TrueType");
pdfioDictSetName(dict, "BaseFont", basefont);
if (ttfGetMaxChar(font) >= 255)
pdfioDictSetObj(dict, "Encoding", pdf->cp1252_obj);
pdfioDictSetObj(dict, "FontDescriptor", desc_obj);
if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
{
ttfDelete(font);
return (NULL);
}
pdfioObjClose(obj);
}
ttfDelete(font);
return (obj);
}
//
// 'pdfioFileCreateICCObjFromFile()' - Add an ICC profile object to a PDF file.
//
pdfio_obj_t * // O - Object
pdfioFileCreateICCObjFromFile(
pdfio_file_t *pdf, // I - PDF file
const char *filename, // I - Filename
size_t num_colors) // I - Number of color components (1, 3, or 4)
{
pdfio_dict_t *dict; // ICC profile dictionary
pdfio_obj_t *obj; // ICC profile object
pdfio_stream_t *st; // ICC profile stream
int fd; // File
unsigned char buffer[16384]; // Read buffer
ssize_t bytes; // Bytes read
// Range check input...
if (!pdf)
return (NULL);
if (!filename)
{
_pdfioFileError(pdf, "No ICC profile filename specified.");
return (NULL);
}
if ((fd = open(filename, O_RDONLY | O_BINARY)) < 0)
{
_pdfioFileError(pdf, "Unable to open ICC profile '%s': %s", filename, strerror(errno));
return (NULL);
}
if (num_colors != 1 && num_colors != 3 && num_colors != 4)
{
_pdfioFileError(pdf, "Unsupported number of colors (%lu) for ICC profile.", (unsigned long)num_colors);
close(fd);
return (NULL);
}
// Create the ICC profile object...
if ((dict = pdfioDictCreate(pdf)) == NULL)
{
close(fd);
return (NULL);
}
pdfioDictSetNumber(dict, "N", num_colors);
pdfioDictSetName(dict, "Filter", "FlateDecode");
if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
{
close(fd);
return (NULL);
}
if ((st = pdfioObjCreateStream(obj, PDFIO_FILTER_FLATE)) == NULL)
{
close(fd);
return (NULL);
}
while ((bytes = read(fd, buffer, sizeof(buffer))) > 0)
{
if (!pdfioStreamWrite(st, buffer, (size_t)bytes))
{
close(fd);
pdfioStreamClose(st);
return (NULL);
}
}
close(fd);
pdfioStreamClose(st);
return (obj);
}
//
// 'pdfioFileCreateImageObjFromData()' - Add image object(s) to a PDF file from memory.
//
// This function creates image object(s) in a PDF file from a data buffer in
// memory. The "data" parameter points to the image data as 8-bit color values.
// The "width" and "height" parameters specify the image dimensions. The
// "num_colors" parameter specifies the number of color components (`1` for
// grayscale, `3` for RGB, and `4` for CMYK) and the "alpha" parameter specifies
// whether each color tuple is followed by an alpha value. The "color_data"
// parameter specifies an optional color space array for the image - if `NULL`,
// the image is encoded in the corresponding device color space. The
// "interpolate" parameter specifies whether to interpolate when scaling the
// image on the page.
//
// Note: When creating an image object with alpha, a second image object is
// created to hold the "soft mask" data for the primary image.
//
pdfio_obj_t * // O - Object
pdfioFileCreateImageObjFromData(
pdfio_file_t *pdf, // I - PDF file
const unsigned char *data, // I - Pointer to image data
size_t width, // I - Width of image
size_t height, // I - Height of image
size_t num_colors, // I - Number of colors
pdfio_array_t *color_data, // I - Colorspace data or `NULL` for default
bool alpha, // I - `true` if data contains an alpha channel
bool interpolate) // I - Interpolate image data?
{
pdfio_dict_t *dict, // Image dictionary
*decode; // DecodeParms dictionary
pdfio_obj_t *obj, // Image object
*mask_obj = NULL;
// Mask image object, if any
pdfio_stream_t *st; // Image stream
size_t x, y, // X and Y position in image
bpp, // Bytes per pixel
linelen; // Line length
const unsigned char *dataptr; // Pointer into image data
unsigned char *line = NULL, // Current line
*lineptr; // Pointer into line
static const char *defcolors[] = // Default ColorSpace values
{
NULL,
"DeviceGray",
NULL,
"DeviceRGB",
"DeviceCMYK"
};
// Range check input...
if (!pdf || !data || !width || !height || num_colors < 1 || num_colors == 2 || num_colors > 4)
return (NULL);
// Allocate memory for one line of data...
bpp = alpha ? num_colors + 1 : num_colors;
linelen = num_colors * width;
if ((line = malloc(linelen)) == NULL)
return (NULL);
// Generate a mask image, as needed...
if (alpha)
{
// Create the image mask dictionary...
if ((dict = pdfioDictCreate(pdf)) == NULL)
{
free(line);
return (NULL);
}
pdfioDictSetName(dict, "Type", "XObject");
pdfioDictSetName(dict, "Subtype", "Image");
pdfioDictSetNumber(dict, "Width", width);
pdfioDictSetNumber(dict, "Height", height);
pdfioDictSetNumber(dict, "BitsPerComponent", 8);
pdfioDictSetName(dict, "ColorSpace", "DeviceGray");
pdfioDictSetName(dict, "Filter", "FlateDecode");
if ((decode = pdfioDictCreate(pdf)) == NULL)
{
free(line);
return (NULL);
}
pdfioDictSetNumber(decode, "BitsPerComponent", 8);
pdfioDictSetNumber(decode, "Colors", 1);
pdfioDictSetNumber(decode, "Columns", width);
pdfioDictSetNumber(decode, "Predictor", _PDFIO_PREDICTOR_PNG_AUTO);
pdfioDictSetDict(dict, "DecodeParms", decode);
// Create the mask object and write the mask image...
if ((mask_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
{
free(line);
return (NULL);
}
if ((st = pdfioObjCreateStream(mask_obj, PDFIO_FILTER_FLATE)) == NULL)
{
free(line);
pdfioObjClose(mask_obj);
return (NULL);
}
for (y = height, dataptr = data + num_colors; y > 0; y --)
{
for (x = width, lineptr = line; x > 0; x --, dataptr += bpp)
*lineptr++ = *dataptr;
pdfioStreamWrite(st, line, width);
}
pdfioStreamClose(st);
}
// Now create the image...
if ((dict = pdfioDictCreate(pdf)) == NULL)
{
free(line);
return (NULL);
}
pdfioDictSetName(dict, "Type", "XObject");
pdfioDictSetName(dict, "Subtype", "Image");
pdfioDictSetBoolean(dict, "Interpolate", interpolate);
pdfioDictSetNumber(dict, "Width", width);
pdfioDictSetNumber(dict, "Height", height);
pdfioDictSetNumber(dict, "BitsPerComponent", 8);
pdfioDictSetName(dict, "Filter", "FlateDecode");
if (color_data)
pdfioDictSetArray(dict, "ColorSpace", color_data);
else
pdfioDictSetName(dict, "ColorSpace", defcolors[num_colors]);
if (mask_obj)
pdfioDictSetObj(dict, "SMask", mask_obj);
if ((decode = pdfioDictCreate(pdf)) == NULL)
{
free(line);
return (NULL);
}
pdfioDictSetNumber(decode, "BitsPerComponent", 8);
pdfioDictSetNumber(decode, "Colors", num_colors);
pdfioDictSetNumber(decode, "Columns", width);
pdfioDictSetNumber(decode, "Predictor", _PDFIO_PREDICTOR_PNG_AUTO);
pdfioDictSetDict(dict, "DecodeParms", decode);
if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
{
free(line);
return (NULL);
}
if ((st = pdfioObjCreateStream(obj, PDFIO_FILTER_FLATE)) == NULL)
{
free(line);
pdfioObjClose(obj);
return (NULL);
}
for (y = height, dataptr = data; y > 0; y --)
{
if (alpha)
{
switch (num_colors)
{
case 1 :
for (x = width, lineptr = line; x > 0; x --, dataptr += bpp)
*lineptr++ = *dataptr;
break;
case 3 :
for (x = width, lineptr = line; x > 0; x --, dataptr += bpp)
{
*lineptr++ = dataptr[0];
*lineptr++ = dataptr[1];
*lineptr++ = dataptr[2];
}
break;
case 4 :
for (x = width, lineptr = line; x > 0; x --, dataptr += bpp)
{
*lineptr++ = dataptr[0];
*lineptr++ = dataptr[1];
*lineptr++ = dataptr[2];
*lineptr++ = dataptr[3];
}
break;
}
pdfioStreamWrite(st, line, linelen);
}
else
{
pdfioStreamWrite(st, dataptr, linelen);
dataptr += linelen;
}
}
free(line);
pdfioStreamClose(st);
return (obj);
}
//
// 'pdfioFileCreateImageObjFromFile()' - Add an image object to a PDF file from a file.
//
// This function creates an image object in a PDF file from a JPEG or PNG file.
// The "filename" parameter specifies the name of the JPEG or PNG file, while
// the "interpolate" parameter specifies whether to interpolate when scaling the
// image on the page.
//
// > Note: Currently PNG support is limited to grayscale, RGB, or indexed files
// > without interlacing or alpha. Transparency (masking) based on color/index
// > is supported.
//
pdfio_obj_t * // O - Object
pdfioFileCreateImageObjFromFile(
pdfio_file_t *pdf, // I - PDF file
const char *filename, // I - Filename
bool interpolate) // I - Interpolate image data?
{
pdfio_dict_t *dict; // Image dictionary
pdfio_obj_t *obj; // Image object
int fd; // File
unsigned char buffer[32]; // Read buffer
_pdfio_image_func_t copy_func = NULL; // Image copy function
// Range check input...
if (!pdf || !filename)
return (NULL);
// Try opening the file...
if ((fd = open(filename, O_RDONLY | O_BINARY)) < 0)
{
_pdfioFileError(pdf, "Unable to open image file '%s': %s", filename, strerror(errno));
return (NULL);
}
// Read the file header to determine the file format...
if (read(fd, buffer, sizeof(buffer)) < (ssize_t)sizeof(buffer))
{
_pdfioFileError(pdf, "Unable to read header from image file '%s'.", filename);
close(fd);
return (NULL);
}
lseek(fd, 0, SEEK_SET);
if (!memcmp(buffer, "\211PNG\015\012\032\012\000\000\000\015IHDR", 16))
{
// PNG image...
copy_func = copy_png;
}
else if (!memcmp(buffer, "\377\330\377", 3))
{
// JPEG image...
copy_func = copy_jpeg;
}
else
{
// Something else that isn't supported...
_pdfioFileError(pdf, "Unsupported image file '%s'.", filename);
close(fd);
return (NULL);
}
// Create the base image dictionary the copy the file into an object...
if ((dict = pdfioDictCreate(pdf)) == NULL)
{
close(fd);
return (NULL);
}
pdfioDictSetName(dict, "Type", "XObject");
pdfioDictSetName(dict, "Subtype", "Image");
pdfioDictSetBoolean(dict, "Interpolate", interpolate);
obj = (copy_func)(dict, fd);
// Close the file and return the object...
close(fd);
return (obj);
}
//
// 'pdfioImageGetBytesPerLine()' - Get the number of bytes to read for each line.
//
size_t // O - Number of bytes per line
pdfioImageGetBytesPerLine(
pdfio_obj_t *obj) // I - Image object
{
pdfio_dict_t *params; // DecodeParms value
int width, // Width of image
bpc, // BitsPerComponent of image
colors; // Number of colors in image
if (!obj || obj->value.type != PDFIO_VALTYPE_DICT)
return (0);
params = pdfioDictGetDict(obj->value.value.dict, "DecodeParms");
bpc = (int)pdfioDictGetNumber(params, "BitsPerComponent");
colors = (int)pdfioDictGetNumber(params, "Colors");
width = (int)pdfioDictGetNumber(params, "Columns");
if (width == 0)
width = (int)pdfioDictGetNumber(obj->value.value.dict, "Width");
if (bpc == 0)
{
if ((bpc = (int)pdfioDictGetNumber(obj->value.value.dict, "BitsPerComponent")) == 0)
bpc = 8;
}
if (colors == 0)
{
const char *cs_name; // ColorSpace name
pdfio_array_t *cs_array; // ColorSpace array
if ((cs_name = pdfioDictGetName(obj->value.value.dict, "ColorSpace")) == NULL)
{
if ((cs_array = pdfioDictGetArray(obj->value.value.dict, "ColorSpace")) != NULL)
cs_name = pdfioArrayGetName(cs_array, 0);
}
if (!cs_name || strstr(cs_name, "RGB"))
colors = 3;
else if (strstr(cs_name, "CMYK"))
colors = 4;
else
colors = 1;
}
return ((size_t)((width * colors * bpc + 7) / 8));
}
//
// 'pdfioImageGetHeight()' - Get the height of an image object.
//
double // O - Height in lines
pdfioImageGetHeight(pdfio_obj_t *obj) // I - Image object
{
if (obj)
return (pdfioDictGetNumber(obj->value.value.dict, "Height"));
else
return (0.0);
}
//
// 'pdfioImageGetWidth()' - Get the width of an image object.
//
double // O - Width in columns
pdfioImageGetWidth(pdfio_obj_t *obj) // I - Image object
{
if (obj)
return (pdfioDictGetNumber(obj->value.value.dict, "Width"));
else
return (0.0);
}
//
// 'pdfioPageDictAddColorSpace()' - Add a color space to the page dictionary.
//
// This function adds a named color space to the page dictionary.
//
// The names "DefaultCMYK", "DefaultGray", and "DefaultRGB" specify the default
// device color space used for the page.
//
// The "data" array contains a calibrated, indexed, or ICC-based color space
// array that was created using the
// @link pdfioArrayCreateCalibratedColorFromMatrix@,
// @link pdfioArrayCreateCalibratedColorFromPrimaries@,
// @link pdfioArrayCreateICCBasedColor@, or
// @link pdfioArrayCreateIndexedColor@ functions.
//
bool // O - `true` on success, `false` on failure
pdfioPageDictAddColorSpace(
pdfio_dict_t *dict, // I - Page dictionary
const char *name, // I - Color space name
pdfio_array_t *data) // I - Color space array
{
pdfio_dict_t *resources; // Resource dictionary
pdfio_dict_t *colorspace; // ColorSpace dictionary
// Range check input...
if (!dict || !name || !data)
return (false);
// Get the ColorSpace dictionary...
if ((resources = pdfioDictGetDict(dict, "Resources")) == NULL)
{
if ((resources = pdfioDictCreate(dict->pdf)) == NULL)
return (false);
if (!pdfioDictSetDict(dict, "Resources", resources))
return (false);
}
if ((colorspace = pdfioDictGetDict(resources, "ColorSpace")) == NULL)
{
if ((colorspace = pdfioDictCreate(dict->pdf)) == NULL)
return (false);
if (!pdfioDictSetDict(resources, "ColorSpace", colorspace))
return (false);
}
// Now set the color space reference and return...
return (pdfioDictSetArray(colorspace, name, data));
}
//
// 'pdfioPageDictAddFont()' - Add a font object to the page dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioPageDictAddFont(
pdfio_dict_t *dict, // I - Page dictionary
const char *name, // I - Font name
pdfio_obj_t *obj) // I - Font object
{
pdfio_dict_t *resources; // Resource dictionary
pdfio_dict_t *font; // Font dictionary
// Range check input...
if (!dict || !name || !obj)
return (false);
// Get the Resources dictionary...
if ((resources = pdfioDictGetDict(dict, "Resources")) == NULL)
{
if ((resources = pdfioDictCreate(dict->pdf)) == NULL)
return (false);
if (!pdfioDictSetDict(dict, "Resources", resources))
return (false);
}
// Get the Font dictionary...
if ((font = pdfioDictGetDict(resources, "Font")) == NULL)
{
if ((font = pdfioDictCreate(dict->pdf)) == NULL)
return (false);
if (!pdfioDictSetDict(resources, "Font", font))
return (false);
}
// Now set the image reference in the Font resource dictionary and return...
return (pdfioDictSetObj(font, name, obj));
}
//
// 'pdfioPageDictAddImage()' - Add an image object to the page dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioPageDictAddImage(
pdfio_dict_t *dict, // I - Page dictionary
const char *name, // I - Image name
pdfio_obj_t *obj) // I - Image object
{
pdfio_dict_t *resources; // Resource dictionary
pdfio_dict_t *xobject; // XObject dictionary
// Range check input...
if (!dict || !name || !obj)
return (false);
// Get the Resources dictionary...
if ((resources = pdfioDictGetDict(dict, "Resources")) == NULL)
{
if ((resources = pdfioDictCreate(dict->pdf)) == NULL)
return (false);
if (!pdfioDictSetDict(dict, "Resources", resources))
return (false);
}
// Get the XObject dictionary...
if ((xobject = pdfioDictGetDict(resources, "XObject")) == NULL)
{
if ((xobject = pdfioDictCreate(dict->pdf)) == NULL)
return (false);
if (!pdfioDictSetDict(resources, "XObject", xobject))
return (false);
}
// Now set the image reference in the XObject resource dictionary and return...
return (pdfioDictSetObj(xobject, name, obj));
}
//
// 'copy_jpeg()' - Copy a JPEG image.
//
static pdfio_obj_t * // O - Object or `NULL` on error
copy_jpeg(pdfio_dict_t *dict, // I - Dictionary
int fd) // I - File descriptor
{
pdfio_obj_t *obj; // Object
pdfio_stream_t *st; // Stream for JPEG data
ssize_t bytes; // Bytes read
unsigned char buffer[16384], // Read buffer
*bufptr, // Pointer into buffer
*bufend; // End of buffer
size_t length; // Length of chunk
unsigned width = 0, // Width in columns
height = 0, // Height in lines
num_colors = 0; // Number of colors
// Scan the file for a SOFn marker, then we can get the dimensions...
bytes = read(fd, buffer, sizeof(buffer));
for (bufptr = buffer + 2, bufend = buffer + bytes; bufptr < bufend;)
{
if (*bufptr == 0xff)
{
bufptr ++;
if (bufptr >= bufend)
{
/*
* If we are at the end of the current buffer, re-fill and continue...
*/
if ((bytes = read(fd, buffer, sizeof(buffer))) <= 0)
break;
bufptr = buffer;
bufend = buffer + bytes;
}
if (*bufptr == 0xff)
continue;
if ((bufptr + 16) >= bufend)
{
/*
* Read more of the marker...
*/
bytes = bufend - bufptr;
memmove(buffer, bufptr, (size_t)bytes);
bufptr = buffer;
bufend = buffer + bytes;
if ((bytes = read(fd, bufend, sizeof(buffer) - (size_t)bytes)) <= 0)
break;
bufend += bytes;
}
length = (size_t)((bufptr[1] << 8) | bufptr[2]);
PDFIO_DEBUG("copy_jpeg: JPEG X'FF%02X' (length %u)\n", *bufptr, (unsigned)length);
if ((*bufptr >= 0xc0 && *bufptr <= 0xc3) || (*bufptr >= 0xc5 && *bufptr <= 0xc7) || (*bufptr >= 0xc9 && *bufptr <= 0xcb) || (*bufptr >= 0xcd && *bufptr <= 0xcf))
{
// SOFn marker, look for dimensions...
if (bufptr[3] != 8)
{
_pdfioFileError(dict->pdf, "Unable to load %d-bit JPEG image.", bufptr[3]);
return (NULL);
}
width = (unsigned)((bufptr[6] << 8) | bufptr[7]);
height = (unsigned)((bufptr[4] << 8) | bufptr[5]);
num_colors = bufptr[8];
break;
}
// Skip past this marker...
bufptr ++;
bytes = bufend - bufptr;
while (length >= (size_t)bytes)
{
length -= (size_t)bytes;
if ((bytes = read(fd, buffer, sizeof(buffer))) <= 0)
break;
bufptr = buffer;
bufend = buffer + bytes;
}
if (length > (size_t)bytes)
break;
bufptr += length;
}
}
if (width == 0 || height == 0 || (num_colors != 1 && num_colors != 3))
return (NULL);
// Create the image object...
pdfioDictSetNumber(dict, "Width", width);
pdfioDictSetNumber(dict, "Height", height);
pdfioDictSetNumber(dict, "BitsPerComponent", 8);
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromStandard(dict->pdf, num_colors, PDFIO_CS_SRGB));
pdfioDictSetName(dict, "Filter", "DCTDecode");
obj = pdfioFileCreateObj(dict->pdf, dict);
st = pdfioObjCreateStream(obj, PDFIO_FILTER_NONE);
// Copy the file to a stream...
lseek(fd, 0, SEEK_SET);
while ((bytes = read(fd, buffer, sizeof(buffer))) > 0)
{
if (!pdfioStreamWrite(st, buffer, (size_t)bytes))
return (NULL);
}
if (!pdfioStreamClose(st))
return (NULL);
return (obj);
}
//
// 'copy_png()' - Copy a PNG image.
//
static pdfio_obj_t * // O - Object or `NULL` on error
copy_png(pdfio_dict_t *dict, // I - Dictionary
int fd) // I - File descriptor
{
pdfio_obj_t *obj = NULL; // Object
pdfio_stream_t *st = NULL; // Stream for PNG data
pdfio_dict_t *decode = NULL; // Parameters for PNG decode
ssize_t bytes; // Bytes read
unsigned char buffer[16384]; // Read buffer
unsigned i, // Looping var
length, // Length
type, // Chunk code
crc, // CRC-32
temp, // Temporary value
width = 0, // Width
height = 0; // Height
unsigned char bit_depth = 0, // Bit depth
color_type = 0; // Color type
double gamma = 2.2, // Gamma value
wx = 0.0, wy = 0.0, // White point chromacity
rx = 0.0, ry = 0.0, // Red chromacity
gx = 0.0, gy = 0.0, // Green chromacity
bx = 0.0, by = 0.0; // Blue chromacity
pdfio_array_t *mask = NULL; // Color masking array
// Read the file header...
if (read(fd, buffer, 8) != 8)
return (NULL);
// Then read chunks until we have the image data...
while (read(fd, buffer, 8) == 8)
{
// Get the chunk length and type values...
length = (unsigned)((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]);
type = (unsigned)((buffer[4] << 24) | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]);
crc = update_png_crc(0xffffffff, buffer + 4, 4);
switch (type)
{
case _PDFIO_PNG_CHUNK_IDAT : // Image data
if (!width || !height)
{
_pdfioFileError(dict->pdf, "Image data seen in PNG file before header.");
return (NULL);
}
if (!st)
{
PDFIO_DEBUG("copy_png: wx=%g, wy=%g, rx=%g, ry=%g, gx=%g, gy=%g, bx=%g, by=%g\n", wx, wy, rx, ry, gx, gy, bx, by);
PDFIO_DEBUG("copy_png: gamma=%g\n", gamma);
if (!pdfioDictGetArray(dict, "ColorSpace"))
{
PDFIO_DEBUG("copy_png: Adding %s ColorSpace value.\n", color_type == _PDFIO_PNG_TYPE_GRAY ? "CalGray" : "CalRGB");
if (wx != 0.0)
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromPrimaries(dict->pdf, color_type == _PDFIO_PNG_TYPE_GRAY ? 1 : 3, gamma, wx, wy, rx, ry, gx, gy, bx, by));
else
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromStandard(dict->pdf, color_type == _PDFIO_PNG_TYPE_GRAY ? 1 : 3, PDFIO_CS_SRGB));
}
obj = pdfioFileCreateObj(dict->pdf, dict);
if ((st = pdfioObjCreateStream(obj, PDFIO_FILTER_NONE)) == NULL)
{
pdfioObjClose(obj);
return (NULL);
}
}
while (length > 0)
{
if (length > sizeof(buffer))
bytes = (ssize_t)sizeof(buffer);
else
bytes = (ssize_t)length;
if ((bytes = read(fd, buffer, (size_t)bytes)) <= 0)
{
pdfioStreamClose(st);
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
crc = update_png_crc(crc, buffer, (size_t)bytes);
if (!pdfioStreamWrite(st, buffer, (size_t)bytes))
{
pdfioStreamClose(st);
_pdfioFileError(dict->pdf, "Unable to copy image data.");
return (NULL);
}
length -= bytes;
}
break;
case _PDFIO_PNG_CHUNK_IEND : // Image end
if (st)
{
pdfioStreamClose(st);
return (obj);
}
break;
case _PDFIO_PNG_CHUNK_IHDR : // Image header
if (st)
{
pdfioStreamClose(st);
_pdfioFileError(dict->pdf, "Unexpected image header.");
return (NULL);
}
if (length != 13)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
if (read(fd, buffer, length) != length)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
crc = update_png_crc(crc, buffer, length);
width = (unsigned)((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]);
height = (unsigned)((buffer[4] << 24) | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]);
bit_depth = buffer[8];
color_type = buffer[9];
if (width == 0 || height == 0 || (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 && bit_depth != 8 && bit_depth != 16) || (color_type != _PDFIO_PNG_TYPE_GRAY && color_type != _PDFIO_PNG_TYPE_RGB && color_type != _PDFIO_PNG_TYPE_INDEXED) || buffer[10] || buffer[11] || buffer[12])
{
_pdfioFileError(dict->pdf, "Unsupported PNG image.");
return (NULL);
}
pdfioDictSetNumber(dict, "Width", width);
pdfioDictSetNumber(dict, "Height", height);
pdfioDictSetNumber(dict, "BitsPerComponent", bit_depth);
pdfioDictSetName(dict, "Filter", "FlateDecode");
if ((decode = pdfioDictCreate(dict->pdf)) == NULL)
return (NULL);
pdfioDictSetNumber(decode, "BitsPerComponent", bit_depth);
pdfioDictSetNumber(decode, "Colors", color_type == _PDFIO_PNG_TYPE_RGB ? 3 : 1);
pdfioDictSetNumber(decode, "Columns", width);
pdfioDictSetNumber(decode, "Predictor", _PDFIO_PREDICTOR_PNG_AUTO);
pdfioDictSetDict(dict, "DecodeParms", decode);
break;
case _PDFIO_PNG_CHUNK_PLTE : // Palette
if (length == 0 || (length % 3) != 0 || length > 768)
{
pdfioStreamClose(st);
_pdfioFileError(dict->pdf, "Invalid color palette.");
return (NULL);
}
if (read(fd, buffer, length) != length)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
crc = update_png_crc(crc, buffer, length);
PDFIO_DEBUG("copy_png: Adding Indexed ColorSpace value.\n");
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromPalette(dict->pdf, length / 3, buffer));
break;
case _PDFIO_PNG_CHUNK_cHRM : // Cromacities and white point
if (length != 32)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
if (read(fd, buffer, length) != length)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
crc = update_png_crc(crc, buffer, length);
wx = 0.00001 * ((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]);
wy = 0.00001 * ((buffer[4] << 24) | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]);
rx = 0.00001 * ((buffer[8] << 24) | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]);
ry = 0.00001 * ((buffer[12] << 24) | (buffer[13] << 16) | (buffer[14] << 8) | buffer[15]);
gx = 0.00001 * ((buffer[16] << 24) | (buffer[17] << 16) | (buffer[18] << 8) | buffer[19]);
gy = 0.00001 * ((buffer[20] << 24) | (buffer[21] << 16) | (buffer[22] << 8) | buffer[23]);
bx = 0.00001 * ((buffer[24] << 24) | (buffer[25] << 16) | (buffer[26] << 8) | buffer[27]);
by = 0.00001 * ((buffer[28] << 24) | (buffer[29] << 16) | (buffer[30] << 8) | buffer[31]);
break;
case _PDFIO_PNG_CHUNK_gAMA : // Gamma correction
if (length != 4)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
if (read(fd, buffer, length) != length)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
crc = update_png_crc(crc, buffer, length);
gamma = 10000.0 / ((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]);
break;
case _PDFIO_PNG_CHUNK_tRNS : // Transparency information
switch (color_type)
{
case _PDFIO_PNG_TYPE_INDEXED :
if (length > 256)
{
_pdfioFileError(dict->pdf, "Bad transparency chunk in image file.");
return (NULL);
}
if (read(fd, buffer, length) != length)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
for (i = 0; i < length; i ++)
{
if (!buffer[i])
break;
}
if (i < length)
{
if ((mask = pdfioArrayCreate(dict->pdf)) == NULL)
return (NULL);
pdfioArrayAppendNumber(mask, i);
for (i ++; i < length; i ++)
{
if (buffer[i])
break;
}
pdfioArrayAppendNumber(mask, i - 1);
}
break;
case _PDFIO_PNG_TYPE_GRAY :
if (length != 2)
{
_pdfioFileError(dict->pdf, "Bad transparency chunk in image file.");
return (NULL);
}
if (read(fd, buffer, length) != length)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
if ((mask = pdfioArrayCreate(dict->pdf)) == NULL)
return (NULL);
pdfioArrayAppendNumber(mask, buffer[1]);
pdfioArrayAppendNumber(mask, buffer[1]);
break;
case _PDFIO_PNG_TYPE_RGB :
if (length != 6)
{
_pdfioFileError(dict->pdf, "Bad transparency chunk in image file.");
return (NULL);
}
if (read(fd, buffer, length) != length)
{
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
if ((mask = pdfioArrayCreate(dict->pdf)) == NULL)
return (NULL);
pdfioArrayAppendNumber(mask, buffer[1]);
pdfioArrayAppendNumber(mask, buffer[3]);
pdfioArrayAppendNumber(mask, buffer[5]);
pdfioArrayAppendNumber(mask, buffer[1]);
pdfioArrayAppendNumber(mask, buffer[3]);
pdfioArrayAppendNumber(mask, buffer[5]);
break;
}
crc = update_png_crc(crc, buffer, length);
if (mask)
pdfioDictSetArray(dict, "Mask", mask);
break;
default : // Something else
while (length > 0)
{
if (length > sizeof(buffer))
bytes = (ssize_t)sizeof(buffer);
else
bytes = (ssize_t)length;
if ((bytes = read(fd, buffer, (size_t)bytes)) <= 0)
{
pdfioStreamClose(st);
_pdfioFileError(dict->pdf, "Early end-of-file in image file.");
return (NULL);
}
crc = update_png_crc(crc, buffer, (size_t)bytes);
length -= bytes;
}
break;
}
// Verify the CRC...
crc ^= 0xffffffff;
if (read(fd, buffer, 4) != 4)
{
pdfioStreamClose(st);
_pdfioFileError(dict->pdf, "Unable to read CRC.");
return (NULL);
}
temp = (unsigned)((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]);
if (temp != crc)
{
pdfioStreamClose(st);
_pdfioFileError(dict->pdf, "Bad CRC (0x%08x != 0x%08x).", temp, crc);
return (NULL);
}
}
return (NULL);
}
//
// 'create_cp1252()' - Create the CP1252 font encoding object.
//
static bool // O - `true` on success, `false` on failure
create_cp1252(pdfio_file_t *pdf) // I - PDF file
{
int ch; // Current character
bool chindex; // Need character index?
pdfio_dict_t *cp1252_dict; // Encoding dictionary
pdfio_array_t *cp1252_array; // Differences array
static const char * const cp1252[] = // Glyphs for CP1252 encoding
{
"space",
"exclam",
"quotedbl",
"numbersign",
"dollar",
"percent",
"ampersand",
"quotesingle",
"parenleft",
"parenright",
"asterisk",
"plus",
"comma",
"hyphen",
"period",
"slash",
"zero",
"one",
"two",
"three",
"four",
"five",
"six",
"seven",
"eight",
"nine",
"colon",
"semicolon",
"less",
"equal",
"greater",
"question",
"at",
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z",
"bracketleft",
"backslash",
"bracketright",
"asciicircum",
"underscore",
"grave",
"a",
"b",
"c",
"d",
"e",
"f",
"g",
"h",
"i",
"j",
"k",
"l",
"m",
"n",
"o",
"p",
"q",
"r",
"s",
"t",
"u",
"v",
"w",
"x",
"y",
"z",
"braceleft",
"bar",
"braceright",
"asciitilde",
"",
"Euro",
"",
"quotesinglbase",
"florin",
"quotedblbase",
"ellipsis",
"dagger",
"daggerdbl",
"circumflex",
"perthousand",
"Scaron",
"guilsinglleft",
"OE",
"",
"Zcaron",
"",
"",
"quoteleft",
"quoteright",
"quotedblleft",
"quotedblright",
"bullet",
"endash",
"emdash",
"tilde",
"trademark",
"scaron",
"guilsinglright",
"oe",
"",
"zcaron",
"Ydieresis",
"space",
"exclamdown",
"cent",
"sterling",
"currency",
"yen",
"brokenbar",
"section",
"dieresis",
"copyright",
"ordfeminine",
"guillemotleft",
"logicalnot",
"minus",
"registered",
"macron",
"degree",
"plusminus",
"twosuperior",
"threesuperior",
"acute",
"mu",
"paragraph",
"periodcentered",
"cedilla",
"onesuperior",
"ordmasculine",
"guillemotright",
"onequarter",
"onehalf",
"threequarters",
"questiondown",
"Agrave",
"Aacute",
"Acircumflex",
"Atilde",
"Adieresis",
"Aring",
"AE",
"Ccedilla",
"Egrave",
"Eacute",
"Ecircumflex",
"Edieresis",
"Igrave",
"Iacute",
"Icircumflex",
"Idieresis",
"Eth",
"Ntilde",
"Ograve",
"Oacute",
"Ocircumflex",
"Otilde",
"Odieresis",
"multiply",
"Oslash",
"Ugrave",
"Uacute",
"Ucircumflex",
"Udieresis",
"Yacute",
"Thorn",
"germandbls",
"agrave",
"aacute",
"acircumflex",
"atilde",
"adieresis",
"aring",
"ae",
"ccedilla",
"egrave",
"eacute",
"ecircumflex",
"edieresis",
"igrave",
"iacute",
"icircumflex",
"idieresis",
"eth",
"ntilde",
"ograve",
"oacute",
"ocircumflex",
"otilde",
"odieresis",
"divide",
"oslash",
"ugrave",
"uacute",
"ucircumflex",
"udieresis",
"yacute",
"thorn",
"ydieresis"
};
if ((cp1252_dict = pdfioDictCreate(pdf)) == NULL || (cp1252_array = pdfioArrayCreate(pdf)) == NULL)
return (false);
for (ch = 0, chindex = true; ch < (int)(sizeof(cp1252) / sizeof(cp1252[0])); ch ++)
{
if (cp1252[ch][0])
{
// Add this character...
if (chindex)
{
// Add the initial index...
pdfioArrayAppendNumber(cp1252_array, ch + 32);
chindex = false;
}
pdfioArrayAppendName(cp1252_array, cp1252[ch]);
}
else
{
// Flag that we need a new index...
chindex = true;
}
}
pdfioDictSetName(cp1252_dict, "Type", "Encoding");
pdfioDictSetArray(cp1252_dict, "Differences", cp1252_array);
if ((pdf->cp1252_obj = pdfioFileCreateObj(pdf, cp1252_dict)) == NULL)
return (false);
pdfioObjClose(pdf->cp1252_obj);
return (true);
}
//
// 'ttf_error_cb()' - Relay a message from the TTF functions.
//
static void
ttf_error_cb(pdfio_file_t *pdf, // I - PDF file
const char *message) // I - Error message
{
(pdf->error_cb)(pdf, message, pdf->error_data);
}
//
// 'update_png_crc()' - Update the CRC-32 value for a PNG chunk.
//
static unsigned // O - CRC-32 value
update_png_crc(
unsigned crc, // I - CRC-32 value
const unsigned char *buffer, // I - Buffer
size_t length) // I - Length of buffer
{
while (length > 0)
{
crc = png_crc_table[(crc ^ *buffer) & 0xff] ^ (crc >> 8);
buffer ++;
length --;
}
return (crc);
}
//
// 'write_string()' - Write a PDF string.
//
static bool // O - `true` on success, `false` otherwise
write_string(pdfio_stream_t *st, // I - Stream
bool unicode, // I - Unicode text?
const char *s, // I - String
bool *newline) // O - Ends with a newline?
{
int ch; // Unicode character
const char *ptr; // Pointer into string
// Start the string...
if (!pdfioStreamPuts(st, unicode ? "<" : "("))
return (false);
// Loop through the string, handling UTF-8 as needed...
for (ptr = s; *ptr; ptr ++)
{
if ((*ptr & 0xe0) == 0xc0)
{
// Two-byte UTF-8
ch = ((ptr[0] & 0x1f) << 6) | (ptr[1] & 0x3f);
ptr ++;
}
else if ((*ptr & 0xf0) == 0xe0)
{
// Three-byte UTF-8
ch = ((ptr[0] & 0x0f) << 12) | ((ptr[1] & 0x3f) << 6) | (ptr[2] & 0x3f);
ptr += 2;
}
else if ((*ptr & 0xf8) == 0xf0)
{
// Four-byte UTF-8
ch = ((ptr[0] & 0x07) << 18) | ((ptr[1] & 0x3f) << 12) | ((ptr[2] & 0x3f) << 6) | (ptr[3] & 0x3f);
ptr += 3;
}
else if (*ptr == '\n' && newline)
{
*newline = true;
break;
}
else
ch = *ptr & 255;
if (unicode)
{
// Write a two-byte character...
if (!pdfioStreamPrintf(st, "%04X", ch))
return (false);
}
else
{
// Write a one-byte character...
if (ch == '\\' || ch == '(' || ch == ')' || ch < ' ')
{
// Escaped character...
if (ch < ' ')
{
if (!pdfioStreamPrintf(st, "\\%03o", ch))
return (false);
}
else if (!pdfioStreamPrintf(st, "\\%c", ch))
return (false);
}
else
{
// Non-escaped character...
if (ch > 255)
{
// Try mapping from Unicode to CP1252...
int i; // Looping var
for (i = 0; i < (int)(sizeof(_pdfio_cp1252) / sizeof(_pdfio_cp1252[0])); i ++)
{
if (ch == _pdfio_cp1252[i])
{
ch = i + 128;
break;
}
}
if (ch > 255)
ch = '?'; // Unsupported chars map to ?
}
// Write the character...
pdfioStreamPutChar(st, ch);
}
}
}
return (pdfioStreamPuts(st, unicode ? ">" : ")"));
}
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