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Fix image dictionary for new libpng-based PNG image support (Issue #90)

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Michael R Sweet 2025-02-11 20:23:59 -05:00
parent 7c527cc908
commit 7f5fc456bc
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1 changed files with 18 additions and 0 deletions
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18
pdfio-content.c
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@ -2057,6 +2057,8 @@ pdfioFileCreateImageObjFromFile(
_pdfio_image_func_t copy_func = NULL; // Image copy function
PDFIO_DEBUG("pdfioFileCreateImageObjFromFile(pdf=%p, filename=\"%s\", interpolate=%s)\n", (void *)pdf, filename, interpolate ? "true" : "false");
// Range check input...
if (!pdf || !filename)
return (NULL);
@ -2078,6 +2080,8 @@ pdfioFileCreateImageObjFromFile(
lseek(fd, 0, SEEK_SET);
PDFIO_DEBUG("pdfioFileCreateImageObjFromFile: buffer=<%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X>\n", buffer[0], buffer[1], buffer[2], buffer[3], buffer[4], buffer[5], buffer[6], buffer[7], buffer[8], buffer[9], buffer[10], buffer[11], buffer[12], buffer[13], buffer[14], buffer[15], buffer[16], buffer[17], buffer[18], buffer[19], buffer[20], buffer[21], buffer[22], buffer[23], buffer[24], buffer[25], buffer[26], buffer[27], buffer[28], buffer[29], buffer[30], buffer[31]);
if (!memcmp(buffer, "\211PNG\015\012\032\012\000\000\000\015IHDR", 16))
{
// PNG image...
@ -2494,6 +2498,8 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
bool alpha; // Alpha transparency?
PDFIO_DEBUG("copy_png(dict=%p, fd=%d)\n", (void *)dict, fd);
// Allocate memory for PNG reader structures...
if ((pp = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)dict->pdf, png_error_func, png_error_func)) == NULL)
{
@ -2507,10 +2513,13 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
goto finish_png;
}
PDFIO_DEBUG("copy_png: pp=%p, info=%p\n", (void *)pp, (void *)info);
if (setjmp(png_jmpbuf(pp)))
{
// If we get here, PNG loading failed and any errors/warnings were logged
// via the corresponding callback functions...
fputs("copy_png: setjmp error handler called.\n", stderr);
goto finish_png;
}
@ -2537,6 +2546,8 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
else
num_colors = 1;
PDFIO_DEBUG("copy_png: width=%u, height=%u, color_type=%u, num_colors=%d\n", width, height, color_type, num_colors);
// Set decoding options...
if (png_get_valid(pp, info, PNG_INFO_tRNS))
{
@ -2591,6 +2602,11 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
for (i = png_set_interlace_handling(pp); i > 0; i --)
png_read_rows(pp, rows, NULL, (png_uint_32)height);
// Add image dictionary information...
pdfioDictSetNumber(dict, "Width", width);
pdfioDictSetNumber(dict, "Height", height);
pdfioDictSetNumber(dict, "BitsPerComponent", 8);
// Grab any color space/palette information...
pdfioDictSetArray(dict, "ColorSpace", pdfioArrayCreateColorFromStandard(dict->pdf, num_colors, PDFIO_CS_SRGB));
@ -3475,6 +3491,8 @@ png_read_func(png_structp pp, // I - PNG pointer
ssize_t bytes; // Bytes read
PDFIO_DEBUG("png_read_func(pp=%p, data=%p, length=%lu)\n", (void *)pp, (void *)data, (unsigned long)length);
if ((bytes = read(*fd, data, length)) < (ssize_t)length)
png_error(pp, "Unable to read from PNG file.");
}