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Implement pdfioFileCreateImageObjFromData (Issue #15)
This commit is contained in:
Michael R Sweet
parent
47d6a34d07
commit
014c5dccba
196
pdfio-content.c
196
pdfio-content.c
@ -1491,8 +1491,7 @@ pdfioFileCreateFontObjFromFile(
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pdfioDictSetName(dict, "Subtype", "Type0");
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pdfioDictSetName(dict, "BaseFont", basefont);
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pdfioDictSetArray(dict, "DescendantFonts", descendants);
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// pdfioDictSetName(dict, "Encoding", "Identity-H");
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pdfioDictSetName(dict, "Encoding", "UniCNS-UCS2-H");
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pdfioDictSetName(dict, "Encoding", "Identity-H");
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if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
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return (NULL);
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@ -1619,9 +1618,200 @@ pdfioFileCreateICCObjFromFile(
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//
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// 'pdfioFileCreateImageObjFromFile()' - Add an image object to a PDF file.
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// 'pdfioFileCreateImageObjFromData()' - Add an image object to a PDF file from memory.
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//
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// This function creates an image object in a PDF file from a data buffer in
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// memory. The "data" parameter points to the image data as 8-bit values. The
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// "width" and "height" parameters specify the image dimensions. The
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// "num_colors" parameter specifies the number of color components as follows:
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//
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// - 1 = grayscale
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// - 2 = grayscale + alpha
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// - 3 = RGB
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// - 4 = RGBA
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//
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// The "color_data" parameter specifies an optional color space array for the
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// image. The "interpolate" parameter specifies whether to interpolate when
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// scaling the image on the page.
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//
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pdfio_obj_t * // O - Object
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pdfioFileCreateImageObjFromData(
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pdfio_file_t *pdf, // I - PDF file
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const unsigned char *data, // I - Pointer to image data
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size_t width, // I - Width of image
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size_t height, // I - Height of image
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int num_colors, // I - Number of colors
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pdfio_array_t *color_data, // I - Colorspace data or `NULL` for default
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bool interpolate) // I - Interpolate image data?
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{
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pdfio_dict_t *dict, // Image dictionary
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*decode; // DecodeParms dictionary
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pdfio_obj_t *obj, // Image object
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*mask_obj = NULL;
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// Mask image object, if any
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pdfio_stream_t *st; // Image stream
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size_t x, y, // X and Y position in image
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linelen; // Line length
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const unsigned char *dataptr; // Pointer into image data
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unsigned char *line = NULL, // Current line
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*lineptr; // Pointer into line
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// Range check input...
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if (!pdf || !data || !width || !height || num_colors < 1 || num_colors > 4)
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return (NULL);
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// Allocate memory for one line of data...
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linelen = (num_colors < 3 ? 1 : 3) * width;
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if ((line = malloc(linelen)) == NULL)
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return (NULL);
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// Generate a mask image, as needed...
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if (!(num_colors & 1))
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{
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// Create the image mask dictionary...
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if ((dict = pdfioDictCreate(pdf)) == NULL)
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{
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free(line);
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return (NULL);
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}
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pdfioDictSetName(dict, "Type", "XObject");
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pdfioDictSetName(dict, "Subtype", "Image");
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pdfioDictSetNumber(dict, "Width", width);
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pdfioDictSetNumber(dict, "Height", height);
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pdfioDictSetNumber(dict, "BitsPerComponent", 8);
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pdfioDictSetBoolean(dict, "ImageMask", true);
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if ((decode = pdfioDictCreate(pdf)) == NULL)
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{
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free(line);
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return (NULL);
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}
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pdfioDictSetNumber(decode, "BitsPerComponent", 8);
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pdfioDictSetNumber(decode, "Colors", num_colors - 1);
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pdfioDictSetNumber(decode, "Columns", width);
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pdfioDictSetNumber(decode, "Predictor", _PDFIO_PREDICTOR_PNG_AUTO);
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pdfioDictSetDict(dict, "DecodeParms", decode);
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// Create the mask object and write the mask image...
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if ((mask_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
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{
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free(line);
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return (NULL);
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}
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if ((st = pdfioObjCreateStream(mask_obj, PDFIO_FILTER_FLATE)) == NULL)
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{
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free(line);
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pdfioObjClose(mask_obj);
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return (NULL);
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}
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for (y = height, dataptr = data + num_colors - 1; y > 0; y --)
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{
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for (x = width, lineptr = line; x > 0; x --, dataptr += num_colors)
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*lineptr++ = *dataptr;
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pdfioStreamWrite(st, line, width);
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}
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pdfioStreamClose(st);
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}
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// Now create the image...
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if ((dict = pdfioDictCreate(pdf)) == NULL)
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{
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free(line);
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return (NULL);
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}
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pdfioDictSetName(dict, "Type", "XObject");
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pdfioDictSetName(dict, "Subtype", "Image");
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pdfioDictSetBoolean(dict, "Interpolate", interpolate);
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pdfioDictSetNumber(dict, "Width", width);
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pdfioDictSetNumber(dict, "Height", height);
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pdfioDictSetNumber(dict, "BitsPerComponent", 8);
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if (color_data)
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pdfioDictSetArray(dict, "ColorSpace", color_data);
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else
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pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromMatrix(pdf, num_colors < 3 ? 1 : 3, pdfioSRGBGamma, pdfioSRGBMatrix, pdfioSRGBWhitePoint));
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if (mask_obj)
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pdfioDictSetObj(dict, "SMask", mask_obj);
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if ((decode = pdfioDictCreate(pdf)) == NULL)
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{
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free(line);
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return (NULL);
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}
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pdfioDictSetNumber(decode, "BitsPerComponent", 8);
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pdfioDictSetNumber(decode, "Colors", num_colors < 3 ? 1 : 3);
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pdfioDictSetNumber(decode, "Columns", width);
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pdfioDictSetNumber(decode, "Predictor", _PDFIO_PREDICTOR_PNG_AUTO);
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pdfioDictSetDict(dict, "DecodeParms", decode);
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if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
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{
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free(line);
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return (NULL);
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}
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if ((st = pdfioObjCreateStream(obj, PDFIO_FILTER_FLATE)) == NULL)
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{
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free(line);
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pdfioObjClose(obj);
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return (NULL);
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}
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for (y = height, dataptr = data; y > 0; y --)
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{
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switch (num_colors)
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{
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case 1 :
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pdfioStreamWrite(st, dataptr, linelen);
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dataptr += linelen;
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break;
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case 2 :
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for (x = width, lineptr = line; x > 0; x --, dataptr += num_colors)
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*lineptr++ = *dataptr;
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pdfioStreamWrite(st, line, linelen);
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break;
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case 3 :
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pdfioStreamWrite(st, dataptr, linelen);
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dataptr += linelen;
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break;
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case 4 :
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for (x = width, lineptr = line; x > 0; x --, dataptr += num_colors)
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{
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*lineptr++ = dataptr[0];
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*lineptr++ = dataptr[1];
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*lineptr++ = dataptr[2];
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}
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pdfioStreamWrite(st, line, linelen);
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break;
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}
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}
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free(line);
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pdfioStreamClose(st);
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return (obj);
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}
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//
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// 'pdfioFileCreateImageObjFromFile()' - Add an image object to a PDF file from a file.
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//
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// This function creates an image object in a PDF file from a JPEG or PNG file.
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// The "filename" parameter specifies the name of the JPEG or PNG file, while
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// the "interpolate" parameter specifies whether to interpolate when scaling the
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// image on the page.
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//
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// > Note: Currently PNG support is limited to grayscale, RGB, or indexed files
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// > without interlacing or alpha. Transparency (masking) based on color/index
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@ -147,6 +147,7 @@ extern bool pdfioContentTextShowJustified(pdfio_stream_t *st, bool unicode, siz
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extern pdfio_obj_t *pdfioFileCreateFontObjFromBase(pdfio_file_t *pdf, const char *name) PDFIO_PUBLIC;
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extern pdfio_obj_t *pdfioFileCreateFontObjFromFile(pdfio_file_t *pdf, const char *filename, bool unicode) PDFIO_PUBLIC;
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extern pdfio_obj_t *pdfioFileCreateICCObjFromFile(pdfio_file_t *pdf, const char *filename, size_t num_colors) PDFIO_PUBLIC;
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extern pdfio_obj_t *pdfioFileCreateImageObjFromData(pdfio_file_t *pdf, const unsigned char *data, size_t width, size_t height, int num_colors, pdfio_array_t *color_data, bool interpolate) PDFIO_PUBLIC;
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extern pdfio_obj_t *pdfioFileCreateImageObjFromFile(pdfio_file_t *pdf, const char *filename, bool interpolate) PDFIO_PUBLIC;
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// Image object helpers...
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