2007-04-09 05:55:29 -07:00
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#include "loader_common.h"
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2004-11-01 01:45:31 -08:00
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#include <png.h>
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2007-08-24 19:33:51 -07:00
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/* this is a quick sample png loader module... nice and small isn't it? */
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2004-11-01 01:45:31 -08:00
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/* PNG stuff */
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#define PNG_BYTES_TO_CHECK 4
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static void
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comment_free(ImlibImage * im, void *data)
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{
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free(data);
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}
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char
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load(ImlibImage * im, ImlibProgressFunction progress,
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char progress_granularity, char immediate_load)
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{
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png_uint_32 w32, h32;
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int w, h;
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2007-08-24 19:33:51 -07:00
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char hasa = 0;
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2004-11-01 01:45:31 -08:00
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FILE *f;
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png_structp png_ptr = NULL;
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png_infop info_ptr = NULL;
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int bit_depth, color_type, interlace_type;
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2007-08-24 19:33:51 -07:00
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/* if immediate_load is 1, then don't delay image loading as below, or */
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/* already data in this image - don't load it again */
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2004-11-01 01:45:31 -08:00
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if (im->data)
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return 0;
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f = fopen(im->real_file, "rb");
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if (!f)
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return 0;
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/* read header */
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if (!im->data)
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{
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unsigned char buf[PNG_BYTES_TO_CHECK];
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2007-08-24 19:33:51 -07:00
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/* if we haven't read the header before, set the header data */
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2014-01-18 11:20:06 -08:00
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if (fread(buf, 1, PNG_BYTES_TO_CHECK, f) != PNG_BYTES_TO_CHECK)
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{
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fclose(f);
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return 0;
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}
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2010-02-11 12:01:54 -08:00
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if (png_sig_cmp(buf, 0, PNG_BYTES_TO_CHECK))
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2004-11-01 01:45:31 -08:00
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{
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fclose(f);
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return 0;
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}
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rewind(f);
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png_ptr =
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2011-04-09 02:24:44 -07:00
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png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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2004-11-01 01:45:31 -08:00
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if (!png_ptr)
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{
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fclose(f);
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return 0;
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}
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info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr)
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{
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png_destroy_read_struct(&png_ptr, NULL, NULL);
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fclose(f);
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return 0;
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}
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2011-02-19 11:23:57 -08:00
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if (setjmp(png_jmpbuf(png_ptr)))
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2004-11-01 01:45:31 -08:00
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{
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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fclose(f);
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return 0;
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}
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png_init_io(png_ptr, f);
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png_read_info(png_ptr, info_ptr);
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png_get_IHDR(png_ptr, info_ptr, (png_uint_32 *) (&w32),
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(png_uint_32 *) (&h32), &bit_depth, &color_type,
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&interlace_type, NULL, NULL);
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im->w = (int)w32;
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im->h = (int)h32;
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2009-07-27 14:05:12 -07:00
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if (!IMAGE_DIMENSIONS_OK(w32, h32))
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2007-08-24 19:33:51 -07:00
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{
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2006-11-04 20:58:06 -08:00
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png_read_end(png_ptr, info_ptr);
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png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
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fclose(f);
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return 0;
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2004-11-01 01:45:31 -08:00
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}
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2007-08-24 19:33:51 -07:00
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if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
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hasa = 1;
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if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
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hasa = 1;
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if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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hasa = 1;
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2004-11-01 01:45:31 -08:00
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if (hasa)
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SET_FLAG(im->flags, F_HAS_ALPHA);
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else
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UNSET_FLAG(im->flags, F_HAS_ALPHA);
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/* set the format string member to the lower-case full extension */
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/* name for the format - so example names would be: */
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/* "png", "jpeg", "tiff", "ppm", "pgm", "pbm", "gif", "xpm" ... */
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if (!im->loader)
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im->format = strdup("png");
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}
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/* if its the second phase load OR its immediate load or a progress */
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/* callback is set then load the data */
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if ((im->loader) || (immediate_load) || (progress))
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{
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unsigned char **lines;
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int i;
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w = im->w;
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h = im->h;
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2007-08-24 19:33:51 -07:00
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/* Prep for transformations... ultimately we want ARGB */
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/* expand palette -> RGB if necessary */
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_palette_to_rgb(png_ptr);
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/* expand gray (w/reduced bits) -> 8-bit RGB if necessary */
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if ((color_type == PNG_COLOR_TYPE_GRAY) ||
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2011-04-09 02:24:44 -07:00
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(color_type == PNG_COLOR_TYPE_GRAY_ALPHA))
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2007-08-24 19:33:51 -07:00
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{
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png_set_gray_to_rgb(png_ptr);
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if (bit_depth < 8)
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png_set_expand_gray_1_2_4_to_8(png_ptr);
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}
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/* expand transparency entry -> alpha channel if present */
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if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
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png_set_tRNS_to_alpha(png_ptr);
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/* reduce 16bit color -> 8bit color if necessary */
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if (bit_depth > 8)
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png_set_strip_16(png_ptr);
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/* pack all pixels to byte boundaries */
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png_set_packing(png_ptr);
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/* note from raster: */
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2004-11-01 01:45:31 -08:00
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/* thanks to mustapha for helping debug this on PPC Linux remotely by */
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2007-08-24 19:33:51 -07:00
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/* sending across screenshots all the time and me figuring out from them */
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2004-11-01 01:45:31 -08:00
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/* what the hell was up with the colors */
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2007-08-24 19:33:51 -07:00
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/* now png loading should work on big-endian machines nicely */
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2004-11-01 01:45:31 -08:00
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#ifdef WORDS_BIGENDIAN
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png_set_swap_alpha(png_ptr);
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2007-08-24 19:33:51 -07:00
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if (!hasa)
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png_set_filler(png_ptr, 0xff, PNG_FILLER_BEFORE);
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2004-11-01 01:45:31 -08:00
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#else
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png_set_bgr(png_ptr);
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2007-08-24 19:33:51 -07:00
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if (!hasa)
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png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
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2004-11-01 01:45:31 -08:00
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#endif
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2007-08-24 19:33:51 -07:00
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2004-11-01 01:45:31 -08:00
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if (im->data)
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free(im->data);
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im->data = malloc(w * h * sizeof(DATA32));
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if (!im->data)
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{
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png_read_end(png_ptr, info_ptr);
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png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
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fclose(f);
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return 0;
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}
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lines = (unsigned char **)malloc(h * sizeof(unsigned char *));
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if (!lines)
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{
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free(im->data);
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im->data = NULL;
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png_read_end(png_ptr, info_ptr);
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png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
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fclose(f);
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return 0;
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}
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for (i = 0; i < h; i++)
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lines[i] = ((unsigned char *)(im->data)) + (i * w * sizeof(DATA32));
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if (progress)
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{
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int y, count, prevy, pass, number_passes, per,
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2011-04-09 02:24:44 -07:00
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nrows = 1;
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2004-11-01 01:45:31 -08:00
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count = 0;
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number_passes = png_set_interlace_handling(png_ptr);
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for (pass = 0; pass < number_passes; pass++)
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{
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prevy = 0;
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per = 0;
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for (y = 0; y < h; y += nrows)
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{
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png_read_rows(png_ptr, &lines[y], NULL, nrows);
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per = (((pass * h) + y) * 100) / (h * number_passes);
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if ((per - count) >= progress_granularity)
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{
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count = per;
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if (!progress(im, per, 0, prevy, w, y - prevy + 1))
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{
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free(lines);
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png_read_end(png_ptr, info_ptr);
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png_destroy_read_struct(&png_ptr, &info_ptr,
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(png_infopp) NULL);
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fclose(f);
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return 2;
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}
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prevy = y + 1;
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}
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}
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if (!progress(im, per, 0, prevy, w, y - prevy + 1))
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{
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free(lines);
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png_read_end(png_ptr, info_ptr);
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png_destroy_read_struct(&png_ptr, &info_ptr,
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(png_infopp) NULL);
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fclose(f);
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return 2;
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}
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}
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}
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else
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png_read_image(png_ptr, lines);
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free(lines);
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png_read_end(png_ptr, info_ptr);
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}
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#ifdef PNG_TEXT_SUPPORTED
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{
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png_textp text;
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int num;
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int i;
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num = 0;
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png_get_text(png_ptr, info_ptr, &text, &num);
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for (i = 0; i < num; i++)
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{
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if (!strcmp(text[i].key, "Imlib2-Comment"))
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__imlib_AttachTag(im, "comment", 0, strdup(text[i].text),
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comment_free);
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}
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}
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#endif
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png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
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fclose(f);
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return 1;
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}
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char
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save(ImlibImage * im, ImlibProgressFunction progress, char progress_granularity)
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{
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FILE *f;
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png_structp png_ptr;
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png_infop info_ptr;
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DATA32 *ptr;
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2011-02-19 11:33:58 -08:00
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int x, y, j, interlace;
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2004-11-01 01:45:31 -08:00
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png_bytep row_ptr, data = NULL;
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png_color_8 sig_bit;
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int pl = 0;
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char pper = 0;
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ImlibImageTag *tag;
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int quality = 75, compression = 3, num_passes = 1, pass;
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if (!im->data)
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return 0;
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f = fopen(im->real_file, "wb");
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if (!f)
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return 0;
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png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!png_ptr)
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{
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fclose(f);
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return 0;
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}
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info_ptr = png_create_info_struct(png_ptr);
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2010-08-21 06:52:25 -07:00
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if (!info_ptr)
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2004-11-01 01:45:31 -08:00
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{
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fclose(f);
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png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
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return 0;
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}
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2011-02-19 11:23:57 -08:00
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if (setjmp(png_jmpbuf(png_ptr)))
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2004-11-01 01:45:31 -08:00
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{
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fclose(f);
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png_destroy_write_struct(&png_ptr, (png_infopp) & info_ptr);
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png_destroy_info_struct(png_ptr, (png_infopp) & info_ptr);
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return 0;
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}
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/* check whether we should use interlacing */
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2011-02-19 11:33:58 -08:00
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interlace = PNG_INTERLACE_NONE;
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2004-11-01 01:45:31 -08:00
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if ((tag = __imlib_GetTag(im, "interlacing")) && tag->val)
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{
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#ifdef PNG_WRITE_INTERLACING_SUPPORTED
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2011-04-09 02:24:44 -07:00
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interlace = PNG_INTERLACE_ADAM7;
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2004-11-01 01:45:31 -08:00
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#endif
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}
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2007-08-24 19:33:51 -07:00
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2004-11-01 01:45:31 -08:00
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png_init_io(png_ptr, f);
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if (im->flags & F_HAS_ALPHA)
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{
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png_set_IHDR(png_ptr, info_ptr, im->w, im->h, 8,
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2011-02-19 11:33:58 -08:00
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PNG_COLOR_TYPE_RGB_ALPHA, interlace,
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2004-11-01 01:45:31 -08:00
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PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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#ifdef WORDS_BIGENDIAN
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png_set_swap_alpha(png_ptr);
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#else
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png_set_bgr(png_ptr);
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#endif
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}
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else
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{
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png_set_IHDR(png_ptr, info_ptr, im->w, im->h, 8, PNG_COLOR_TYPE_RGB,
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2011-02-19 11:33:58 -08:00
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interlace, PNG_COMPRESSION_TYPE_BASE,
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2004-11-01 01:45:31 -08:00
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PNG_FILTER_TYPE_BASE);
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data = malloc(im->w * 3 * sizeof(char));
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}
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sig_bit.red = 8;
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sig_bit.green = 8;
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sig_bit.blue = 8;
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sig_bit.alpha = 8;
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png_set_sBIT(png_ptr, info_ptr, &sig_bit);
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/* quality */
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tag = __imlib_GetTag(im, "quality");
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if (tag)
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{
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quality = tag->val;
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if (quality < 1)
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quality = 1;
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if (quality > 99)
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quality = 99;
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}
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/* convert to compression */
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quality = quality / 10;
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compression = 9 - quality;
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/* compression */
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tag = __imlib_GetTag(im, "compression");
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if (tag)
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compression = tag->val;
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if (compression < 0)
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compression = 0;
|
|
|
|
if (compression > 9)
|
|
|
|
compression = 9;
|
|
|
|
tag = __imlib_GetTag(im, "comment");
|
|
|
|
if (tag)
|
|
|
|
{
|
|
|
|
#ifdef PNG_TEXT_SUPPORTED
|
|
|
|
png_text text;
|
|
|
|
|
2013-07-02 13:47:17 -07:00
|
|
|
text.key = (char *)"Imlib2-Comment";
|
2004-11-01 01:45:31 -08:00
|
|
|
text.text = tag->data;
|
|
|
|
text.compression = PNG_TEXT_COMPRESSION_zTXt;
|
|
|
|
png_set_text(png_ptr, info_ptr, &(text), 1);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
png_set_compression_level(png_ptr, compression);
|
|
|
|
png_write_info(png_ptr, info_ptr);
|
|
|
|
png_set_shift(png_ptr, &sig_bit);
|
|
|
|
png_set_packing(png_ptr);
|
|
|
|
|
2011-02-19 11:33:58 -08:00
|
|
|
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
|
|
|
|
num_passes = png_set_interlace_handling(png_ptr);
|
|
|
|
#endif
|
|
|
|
|
2004-11-01 01:45:31 -08:00
|
|
|
for (pass = 0; pass < num_passes; pass++)
|
|
|
|
{
|
2011-04-09 02:24:44 -07:00
|
|
|
ptr = im->data;
|
2004-11-01 01:45:31 -08:00
|
|
|
|
2011-04-09 02:24:44 -07:00
|
|
|
for (y = 0; y < im->h; y++)
|
|
|
|
{
|
|
|
|
if (im->flags & F_HAS_ALPHA)
|
|
|
|
row_ptr = (png_bytep) ptr;
|
|
|
|
else
|
|
|
|
{
|
|
|
|
for (j = 0, x = 0; x < im->w; x++)
|
|
|
|
{
|
|
|
|
data[j++] = (ptr[x] >> 16) & 0xff;
|
|
|
|
data[j++] = (ptr[x] >> 8) & 0xff;
|
|
|
|
data[j++] = (ptr[x]) & 0xff;
|
|
|
|
}
|
|
|
|
row_ptr = (png_bytep) data;
|
|
|
|
}
|
|
|
|
png_write_rows(png_ptr, &row_ptr, 1);
|
|
|
|
if (progress)
|
|
|
|
{
|
|
|
|
char per;
|
|
|
|
int l;
|
2004-11-01 01:45:31 -08:00
|
|
|
|
2011-04-09 02:24:44 -07:00
|
|
|
per = 100 * (pass + y / (float)im->h) / num_passes;
|
|
|
|
if ((per - pper) >= progress_granularity)
|
|
|
|
{
|
|
|
|
l = y - pl;
|
|
|
|
if (!progress(im, per, 0, (y - l), im->w, l))
|
|
|
|
{
|
|
|
|
if (data)
|
|
|
|
free(data);
|
|
|
|
png_write_end(png_ptr, info_ptr);
|
|
|
|
png_destroy_write_struct(&png_ptr,
|
|
|
|
(png_infopp) & info_ptr);
|
|
|
|
png_destroy_info_struct(png_ptr,
|
|
|
|
(png_infopp) & info_ptr);
|
|
|
|
fclose(f);
|
|
|
|
return 2;
|
|
|
|
}
|
|
|
|
pper = per;
|
|
|
|
pl = y;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
ptr += im->w;
|
|
|
|
}
|
|
|
|
}
|
2004-11-01 01:45:31 -08:00
|
|
|
if (data)
|
|
|
|
free(data);
|
|
|
|
png_write_end(png_ptr, info_ptr);
|
|
|
|
png_destroy_write_struct(&png_ptr, (png_infopp) & info_ptr);
|
|
|
|
png_destroy_info_struct(png_ptr, (png_infopp) & info_ptr);
|
|
|
|
|
|
|
|
fclose(f);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2007-08-24 19:33:51 -07:00
|
|
|
/* fills the ImlibLoader struct with a string array of format file */
|
2004-11-01 01:45:31 -08:00
|
|
|
/* extensions this loader can load. eg: */
|
|
|
|
/* loader->formats = { "jpeg", "jpg"}; */
|
|
|
|
/* giving permutations is a good idea. case sensitivity is irrelevant */
|
|
|
|
/* your loader CAN load more than one format if it likes - like: */
|
|
|
|
/* loader->formats = { "gif", "png", "jpeg", "jpg"} */
|
|
|
|
/* if it can load those formats. */
|
|
|
|
void
|
|
|
|
formats(ImlibLoader * l)
|
|
|
|
{
|
2013-07-02 13:47:17 -07:00
|
|
|
static const char *const list_formats[] = { "png" };
|
|
|
|
int i;
|
2004-11-01 01:45:31 -08:00
|
|
|
|
2013-07-02 13:47:17 -07:00
|
|
|
l->num_formats = sizeof(list_formats) / sizeof(char *);
|
|
|
|
l->formats = malloc(sizeof(char *) * l->num_formats);
|
2004-11-01 01:45:31 -08:00
|
|
|
|
2013-07-02 13:47:17 -07:00
|
|
|
for (i = 0; i < l->num_formats; i++)
|
|
|
|
l->formats[i] = strdup(list_formats[i]);
|
2004-11-01 01:45:31 -08:00
|
|
|
}
|