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pdfio/pdfio-content.c
Michael R Sweet bbd0b854b7
Initial PNG support and test files.
2021-06-05 22:56:05 -04:00

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//
// Content helper functions for PDFio.
//
// Copyright © 2021 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
//
// Include necessary headers...
//
#include "pdfio-content.h"
#include "pdfio-private.h"
#include <math.h>
//
// Global constants...
//
const double pdfioAdobeRGBGamma = 2.2;
const double pdfioAdobeRGBMatrix[3][3] = { { 0.57667, 0.18556, 0.18823 }, { 0.29734, 0.62736, 0.07529 }, { 0.02703, 0.07069, 0.99134 } };
const double pdfioAdobeRGBWhitePoint[3] = { 0.9505, 1.0, 1.0890 };
const double pdfioDisplayP3Gamma = 2.2;
const double pdfioDisplayP3Matrix[3][3] = { { 0.48657, 0.26567, 0.19822 }, {
0.22897, 0.69174, 0.07929 }, { 0.00000, 0.04511, 1.04394 } };
const double pdfioDisplayP3WhitePoint[3] = { 0.9505, 1.0, 1.0890 };
const double pdfioSRGBGamma = 2.2;
const double pdfioSRGBMatrix[3][3] = { { 0.4124, 0.3576, 0.1805 }, { 0.2126, 0.7152, 0.0722 }, { 0.0193, 0.1192, 0.9505 } };
const double pdfioSRGBWhitePoint[3] = { 0.9505, 1.0, 1.0890 };
//
// 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
//
// 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 unsigned update_png_crc(unsigned crc, const unsigned char *buffer, size_t length);
static bool write_string(pdfio_stream_t *st, 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
};
//
// 'pdfioArrayCreateCalibratedColorFromMatrix()' - Create a calibrated color space array using a CIE XYZ transform matrix.
//
pdfio_array_t * // O - Color space array
pdfioArrayCreateCalibratedColorFromMatrix(
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);
}
//
// 'pdfioArrayCreateCalibratedColorFromPrimaries()' - Create a calibrated color sapce array using CIE xy primary chromacities.
//
pdfio_array_t * // O - Color space array
pdfioArrayCreateCalibratedColorFromPrimaries(
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 (pdfioArrayCreateCalibratedColorFromMatrix(pdf, num_colors, gamma, matrix, white_point));
}
//
// 'pdfioArrayCreateICCBasedColor()' - Create an ICC-based color space array.
//
pdfio_array_t * // O - Color array
pdfioArrayCreateICCBasedColor(
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");
pdfioArrayAppendObject(icc_color, icc_object);
return (icc_color);
}
//
// 'pdfioArrayCreateIndexedColor()' - Create an indexed color space array.
//
pdfio_array_t * // O - Color array
pdfioArrayCreateIndexedColor(
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);
}
//
// '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(degrees / M_PI); // Cosine
double dsin = sin(degrees / M_PI); // 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));
}
//
// '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.
//
bool // O - `true` on success, `false` on failure
pdfioContentSetDashPattern(
pdfio_stream_t *st, // I - Stream
int phase, // I - Phase (offset within pattern)
int on, // I - On length
int off) // I - Off length
{
return (pdfioStreamPrintf(st, "[%d %d] %d 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.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextShow(
pdfio_stream_t *st, // I - Stream
const char *s) // I - String to show
{
bool newline = false; // New line?
// Write the string...
if (!write_string(st, s, &newline))
return (false);
// Draw it...
if (newline)
return (pdfioStreamPuts(st, "Tj T*\n"));
else
return (pdfioStreamPuts(st, "Tj\n"));
}
//
// 'pdfioContentTextShowf()' - Show formatted text.
//
bool
pdfioContentTextShowf(
pdfio_stream_t *st, // I - Stream
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, buffer, &newline))
return (false);
// Draw it...
if (newline)
return (pdfioStreamPuts(st, "Tj T*\n"));
else
return (pdfioStreamPuts(st, "Tj\n"));
}
//
// 'pdfioContentTextShowJustified()' - Show justified text.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextShowJustified(
pdfio_stream_t *st, // I - Stream
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, fragments[i], NULL))
return (false);
}
}
return (pdfioStreamPuts(st, "]TJ\n"));
}
//
// 'pdfioFileCreateBaseFontObject()' - 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`
//
pdfio_obj_t * // O - Font object
pdfioFileCreateBaseFontObject(
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));
pdfioDictSetName(dict, "Encoding", "WinAnsiEncoding");
if ((obj = pdfioFileCreateObject(dict->pdf, dict)) != NULL)
pdfioObjClose(obj);
return (obj);
}
//
// 'pdfioFileCreateFontObject()' - Add a font object to a PDF file.
//
pdfio_obj_t * // O - Font object
pdfioFileCreateFontObject(
pdfio_file_t *pdf, // I - PDF file
const char *filename, // I - Filename
bool unicode) // I - Unicode font?
{
#if 0
pdfio_dict_t *dict; // Font dictionary
pdfio_obj_t *obj; // Font object
pdfio_st_t *st; // Content stream
int fd; // File
char buffer[16384]; // Copy buffer
ssize_t bytes; // Bytes read
#endif // 0
(void)pdf;
(void)filename;
(void)unicode;
return (NULL);
}
//
// 'pdfioFileCreateICCProfileObject()' - Add an ICC profile object to a PDF file.
//
pdfio_obj_t * // O - Object
pdfioFileCreateICCProfileObject(
pdfio_file_t *pdf, // I - PDF file
const char *filename) // I - Filename
{
(void)pdf;
(void)filename;
return (NULL);
}
//
// 'pdfioFileCreateImageObject()' - Add an image object to a PDF file.
//
// Currently only GIF, JPEG, and PNG files are supported.
//
pdfio_obj_t * // O - Object
pdfioFileCreateImageObject(
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 (pdfioDictSetObject(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 (pdfioDictSetObject(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", pdfioArrayCreateCalibratedColorFromMatrix(dict->pdf, num_colors, pdfioSRGBGamma, pdfioSRGBMatrix, pdfioSRGBWhitePoint));
pdfioDictSetName(dict, "Filter", "DCTDecode");
obj = pdfioFileCreateObject(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 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
// 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, 8);
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)
{
obj = pdfioFileCreateObject(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);
if (color_type == _PDFIO_PNG_TYPE_GRAY)
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateCalibratedColorFromMatrix(dict->pdf, 1, pdfioSRGBGamma, NULL, NULL));
else if (color_type == _PDFIO_PNG_TYPE_RGB)
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateCalibratedColorFromMatrix(dict->pdf, 3, pdfioSRGBGamma, pdfioSRGBMatrix, pdfioSRGBWhitePoint));
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);
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateIndexedColor(dict->pdf, length / 3, buffer));
break;
#if 0
case _PDFIO_PNG_CHUNK_cHRM : // Cromacities and white point
break;
case _PDFIO_PNG_CHUNK_gAMA : // Gamma correction
break;
case _PDFIO_PNG_CHUNK_tRNS : // Transparency information
break;
#endif // 0
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.");
return (NULL);
}
}
return (NULL);
}
//
// '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
const char *s, // I - String
bool *newline) // O - Ends with a newline?
{
const char *ptr; // Pointer into string
// Determine whether this is Unicode or just ASCII...
for (ptr = s; *ptr; ptr ++)
{
if (*ptr & 0x80)
{
// UTF-8, allow Unicode up to 255...
if ((*ptr & 0xe0) == 0xc0 && (*ptr & 0x3f) <= 3 && (ptr[1] & 0xc0) == 0x80)
{
ptr ++;
continue;
}
break;
}
}
if (*ptr)
{
// Unicode string...
int ch; // Unicode character
if (!pdfioStreamPuts(st, "<"))
return (false);
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;
// Write a two-byte character...
if (!pdfioStreamPrintf(st, "%04X", ch))
return (false);
}
if (!pdfioStreamPuts(st, ">"))
return (false);
}
else
{
// ASCII string...
const char *start = s; // Start of fragment
if (!pdfioStreamPuts(st, "("))
return (false);
for (ptr = start; *ptr; ptr ++)
{
if (*ptr == '\n' && newline)
{
if (ptr > start)
{
if (!pdfioStreamWrite(st, start, (size_t)(ptr - start)))
return (false);
start = ptr + 1;
}
*newline = true;
break;
}
else if ((*ptr & 0xe0) == 0xc0)
{
// Two-byte UTF-8
unsigned char ch = (unsigned char)(((ptr[0] & 0x1f) << 6) | (ptr[1] & 0x3f));
// Unicode character
if (ptr > start)
{
if (!pdfioStreamWrite(st, start, (size_t)(ptr - start)))
return (false);
}
if (!pdfioStreamWrite(st, &ch, 1))
return (false);
ptr ++;
start = ptr + 1;
}
else if (*ptr == '\\' || *ptr == '(' || *ptr == ')' || *ptr < ' ')
{
if (ptr > start)
{
if (!pdfioStreamWrite(st, start, (size_t)(ptr - start)))
return (false);
}
start = ptr + 1;
if (*ptr < ' ')
{
if (!pdfioStreamPrintf(st, "\\%03o", *ptr))
return (false);
}
else if (!pdfioStreamPrintf(st, "\\%c", *ptr))
return (false);
}
}
if (ptr > start)
{
if (!pdfioStreamPrintf(st, "%s)", start))
return (false);
}
else if (!pdfioStreamPuts(st, ")"))
return (false);
}
return (true);
}
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