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PNG reading support

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This commit is contained in:
Kornel Lesiński
2014-08-04 00:09:46 +01:00
parent 594b7258cc
commit d11fc3c7c8
6 changed files with 132 additions and 6 deletions
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2
Makefile.am
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@@ -108,7 +108,7 @@ endif
cjpeg_SOURCES = cdjpeg.h cderror.h cdjpeg.c cjpeg.c rdbmp.c rdgif.c \
rdppm.c rdswitch.c rdtarga.c rdjpeg.c
rdppm.c rdswitch.c rdtarga.c rdjpeg.c rdpng.c
cjpeg_LDADD = libjpeg.la

4
cderror.h
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@@ -122,6 +122,10 @@ JMESSAGE(JERR_UNKNOWN_FORMAT, "Unrecognized input file format")
#endif
JMESSAGE(JERR_UNSUPPORTED_FORMAT, "Unsupported output file format")
#ifdef PNG_SUPPORTED
JMESSAGE(JERR_PNG_ERROR, "Unable to read PNG file: %s")
#endif
#ifdef JMAKE_ENUM_LIST
JMSG_LASTADDONCODE

1
cdjpeg.h
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@@ -135,6 +135,7 @@ EXTERN(cjpeg_source_ptr) jinit_read_gif JPP((j_compress_ptr cinfo));
EXTERN(djpeg_dest_ptr) jinit_write_gif JPP((j_decompress_ptr cinfo));
EXTERN(cjpeg_source_ptr) jinit_read_jpeg JPP((j_compress_ptr cinfo));
EXTERN(cjpeg_source_ptr) jinit_read_ppm JPP((j_compress_ptr cinfo));
EXTERN(cjpeg_source_ptr) jinit_read_png JPP((j_compress_ptr cinfo));
EXTERN(djpeg_dest_ptr) jinit_write_ppm JPP((j_decompress_ptr cinfo));
EXTERN(cjpeg_source_ptr) jinit_read_rle JPP((j_compress_ptr cinfo));
EXTERN(djpeg_dest_ptr) jinit_write_rle JPP((j_decompress_ptr cinfo));

4
cjpeg.c
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@@ -113,6 +113,10 @@ select_file_type (j_compress_ptr cinfo, FILE * infile)
case 'P':
return jinit_read_ppm(cinfo);
#endif
#ifdef PNG_SUPPORTED
case 0x89:
return jinit_read_png(cinfo);
#endif
#ifdef RLE_SUPPORTED
case 'R':
return jinit_read_rle(cinfo);

11
jconfig.txt
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@@ -130,11 +130,12 @@ typedef unsigned char boolean;
/* These defines indicate which image (non-JPEG) file formats are allowed. */
#define BMP_SUPPORTED /* BMP image file format */
#define GIF_SUPPORTED /* GIF image file format */
#define PPM_SUPPORTED /* PBMPLUS PPM/PGM image file format */
#undef RLE_SUPPORTED /* Utah RLE image file format */
#define TARGA_SUPPORTED /* Targa image file format */
#define PNG_SUPPORTED /* PNG image file format */
#define BMP_SUPPORTED /* BMP image file format */
#define GIF_SUPPORTED /* GIF image file format */
#define PPM_SUPPORTED /* PBMPLUS PPM/PGM image file format */
#undef RLE_SUPPORTED /* Utah RLE image file format */
#define TARGA_SUPPORTED /* Targa image file format */
/* Define this if you want to name both input and output files on the command
* line, rather than using stdout and optionally stdin. You MUST do this if

116
rdpng.c Normal file
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@@ -0,0 +1,116 @@
#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
#ifdef PNG_SUPPORTED
#include <png.h> /* if this fails, you need to install libpng-devel */
typedef struct png_source_struct {
struct cjpeg_source_struct pub;
png_structp png_ptr;
png_infop info_ptr;
JDIMENSION current_row;
} png_source_struct;
METHODDEF(void)
finish_input_png (j_compress_ptr cinfo, cjpeg_source_ptr sinfo);
METHODDEF(JDIMENSION)
get_pixel_rows_png (j_compress_ptr cinfo, cjpeg_source_ptr sinfo);
METHODDEF(void)
start_input_png (j_compress_ptr cinfo, cjpeg_source_ptr sinfo);
GLOBAL(cjpeg_source_ptr)
jinit_read_png(j_compress_ptr cinfo)
{
png_source_struct *source = (*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_IMAGE, sizeof(png_source_struct));
memset(source, 0, sizeof(*source));
/* Fill in method ptrs, except get_pixel_rows which start_input sets */
source->pub.start_input = start_input_png;
source->pub.finish_input = finish_input_png;
return &source->pub;
}
METHODDEF(void) error_input_png(png_structp png_ptr, png_const_charp msg) {
j_compress_ptr cinfo = png_get_error_ptr(png_ptr);
ERREXITS(cinfo, JERR_PNG_ERROR, msg);
}
METHODDEF(void)
start_input_png (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
{
png_source_struct *source = (png_source_struct *)sinfo;
source->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, cinfo, error_input_png, NULL);
source->info_ptr = png_create_info_struct(source->png_ptr);
if (!source->png_ptr || !source->info_ptr) {
ERREXITS(cinfo, JERR_PNG_ERROR, "Can't create read/info_struct");
return;
}
png_set_palette_to_rgb(source->png_ptr);
png_set_expand_gray_1_2_4_to_8(source->png_ptr);
png_set_strip_alpha(source->png_ptr);
png_set_interlace_handling(source->png_ptr);
png_init_io(source->png_ptr, source->pub.input_file);
png_read_info(source->png_ptr, source->info_ptr);
png_uint_32 width, height;
int bit_depth, color_type;
png_get_IHDR(source->png_ptr, source->info_ptr, &width, &height,
&bit_depth, &color_type, NULL, NULL, NULL);
if (color_type == PNG_COLOR_TYPE_GRAY) {
cinfo->in_color_space = JCS_GRAYSCALE;
cinfo->input_components = 1;
} else {
cinfo->in_color_space = JCS_RGB;
cinfo->input_components = 3;
}
cinfo->data_precision = 8;
cinfo->image_width = width;
cinfo->image_height = height;
double gamma = 0.45455;
if (!png_get_valid(source->png_ptr, source->info_ptr, PNG_INFO_sRGB)) {
png_get_gAMA(source->png_ptr, source->info_ptr, &gamma);
}
cinfo->input_gamma = gamma;
sinfo->get_pixel_rows = get_pixel_rows_png;
png_read_update_info(source->png_ptr, source->info_ptr);
png_size_t rowbytes = png_get_rowbytes(source->png_ptr, source->info_ptr);
source->pub.buffer = (*cinfo->mem->alloc_sarray)((j_common_ptr)cinfo, JPOOL_IMAGE, (JDIMENSION)rowbytes, 1);
source->pub.buffer_height = 1;
}
METHODDEF(JDIMENSION)
get_pixel_rows_png (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
{
png_source_struct *source = (png_source_struct *)sinfo;
png_read_row(source->png_ptr, source->pub.buffer[0], NULL);
return 1;
}
METHODDEF(void)
finish_input_png (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
{
png_source_struct *source = (png_source_struct *)sinfo;
png_read_end(source->png_ptr, source->info_ptr);
png_destroy_read_struct(&source->png_ptr, &source->info_ptr, NULL);
}
#endif