389 lines
10 KiB
C
389 lines
10 KiB
C
#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "common.h"
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#include <string.h>
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#include <X11/Xlib.h>
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#include <X11/extensions/XShm.h>
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#include <X11/Xutil.h>
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#include "image.h"
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#include <png.h>
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/* this is a quick sample png loader module... nice and small isnt it? */
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/* PNG stuff */
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#define PNG_BYTES_TO_CHECK 4
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char load (ImlibImage *im,
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void (*progress)(ImlibImage *im, char percent,
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int update_x, int update_y,
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int update_w, int update_h),
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char progress_granularity, char immediate_load);
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char save (ImlibImage *im,
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void (*progress)(ImlibImage *im, char percent,
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int update_x, int update_y,
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int update_w, int update_h),
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char progress_granularity);
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void formats (ImlibLoader *l);
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char
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load (ImlibImage *im,
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void (*progress)(ImlibImage *im, char percent,
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int update_x, int update_y,
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int update_w, int update_h),
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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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char hasa = 0, hasg = 0;
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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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/* if immediate_load is 1, then dont delay image laoding as below, or */
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/* already data in this image - dont load it again */
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if (im->data)
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return 0;
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f = fopen(im->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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/* if we havent read the header before, set the header data */
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fread(buf, 1, PNG_BYTES_TO_CHECK, f);
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if (!png_check_sig(buf, 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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rewind(f);
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png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL,
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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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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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if (setjmp(png_ptr->jmpbuf))
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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,
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(png_uint_32 *)(&w32), (png_uint_32 *)(&h32),
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&bit_depth, &color_type, &interlace_type, NULL, NULL);
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im->w = (int)w32;
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im->h = (int)h32;
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_expand(png_ptr);
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if (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
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hasa = 1;
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if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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{
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hasa = 1;
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hasg = 1;
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}
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if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY)
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hasg = 1;
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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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if (hasa)
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png_set_expand(png_ptr);
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/* we want ARGB */
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/* note form raster: */
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/* thanks to mustapha for helping debug this on PPC Linux remotely by */
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/* sending across screenshots all the tiem and me figuring out form them */
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/* what the hell was up with the colors */
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/* now png loading shoudl work on big endian machines nicely */
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#ifdef WORDS_BIGENDIAN
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png_set_swap_alpha(png_ptr);
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png_set_filler(png_ptr, 0xff, PNG_FILLER_BEFORE);
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#else
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png_set_bgr(png_ptr);
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png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
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#endif
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/* 16bit color -> 8bit color */
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png_set_strip_16(png_ptr);
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/* pack all pixels to byte boundaires */
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png_set_packing(png_ptr);
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if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
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png_set_expand(png_ptr);
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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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if (hasg)
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{
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DATA8 *line;
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int y, count, prevy, pass, number_passes, per, nrows = 1;
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line = malloc(w * 2);
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if (!line)
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{
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free(lines);
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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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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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DATA32 *ptr;
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lines[0] = line;
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png_read_rows(png_ptr, &lines[0], NULL, nrows);
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ptr = ((unsigned char *)(im->data)) + (y * w * sizeof(DATA32));
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for (i = 0; i < w; i++)
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{
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ptr[0] =
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(line[i << 1] << 16) |
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(line[i << 1] << 8) |
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(line[i << 1]) |
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(line[(i << 1) + 1] << 24);
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ptr++;
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}
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if (progress)
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{
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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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progress(im, per, 0, prevy, w, y - prevy + 1);
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prevy = y + 1;
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}
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}
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}
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if (progress)
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progress(im, per, 0, prevy, w, y - prevy + 1);
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}
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free(line);
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}
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else
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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, nrows = 1;
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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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progress(im, per, 0, prevy, w, y - prevy + 1);
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prevy = y + 1;
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}
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}
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progress(im, per, 0, prevy, w, y - prevy + 1);
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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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}
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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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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,
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void (*progress)(ImlibImage *im, char percent,
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int update_x, int update_y,
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int update_w, int update_h),
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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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int x, y, j;
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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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f = fopen(im->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,
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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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if (info_ptr == NULL)
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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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if (setjmp(png_ptr->jmpbuf))
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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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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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PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
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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,
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PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_BASE, 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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png_write_info(png_ptr, info_ptr);
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png_set_shift(png_ptr, &sig_bit);
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png_set_packing(png_ptr);
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ptr = im->data;
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for (y = 0; y < im->h; y++)
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{
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if (im->flags & F_HAS_ALPHA)
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row_ptr = (png_bytep)ptr;
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else
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{
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for (j = 0, x = 0; x < im->w; x++)
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{
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data[j++] = (ptr[x] >> 16) & 0xff;
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data[j++] = (ptr[x] >> 8 ) & 0xff;
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data[j++] = (ptr[x] ) & 0xff;
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}
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row_ptr = (png_bytep)data;
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}
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png_write_rows(png_ptr, &row_ptr, 1);
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if (progress)
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{
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char per;
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int l;
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per = (char)((100 * y) / im->h);
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if ((per - pper) >= progress_granularity)
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{
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l = y - pl;
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progress(im, per, 0, (y - l), im->w, l);
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pper = per;
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pl = y;
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}
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}
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ptr += im->w;
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}
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if (data)
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free(data);
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png_write_end(png_ptr, info_ptr);
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png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
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fclose(f);
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return 1;
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}
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/* fills the ImlibLoader struct with a strign array of format file */
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/* extensions this loader can load. eg: */
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/* loader->formats = { "jpeg", "jpg"}; */
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/* giving permutations is a good idea. case sensitivity is irrelevant */
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/* your laoder CAN load more than one format if it likes - like: */
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/* loader->formats = { "gif", "png", "jpeg", "jpg"} */
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/* if it can load those formats. */
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void
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formats (ImlibLoader *l)
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{
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/* this is the only bit you have to change... */
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char *list_formats[] =
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{ "png" };
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/* don't bother changing any of this - it just reads this in and sets */
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/* the struct values and makes copies */
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{
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int i;
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l->num_formats = (sizeof(list_formats) / sizeof (char *));
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l->formats = malloc(sizeof(char *) * l->num_formats);
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for (i = 0; i < l->num_formats; i++)
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l->formats[i] = strdup(list_formats[i]);
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}
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}
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