mirror of
https://github.com/netsurf-browser/netsurf
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308 lines
8.4 KiB
C
308 lines
8.4 KiB
C
/**
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* $Id: png.c,v 1.1 2003/05/10 11:15:49 bursa Exp $
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*/
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include "libpng/png.h"
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#include "oslib/colourtrans.h"
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#include "oslib/os.h"
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#include "oslib/osspriteop.h"
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#include "netsurf/content/content.h"
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#include "netsurf/riscos/png.h"
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#include "netsurf/utils/log.h"
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#include "netsurf/utils/utils.h"
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/* libpng uses names starting png_, so use nspng_ here to avoid clashes */
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/* maps colours to 256 mode colour numbers */
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static os_colour_number colour_table[4096];
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static void info_callback(png_structp png, png_infop info);
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static void row_callback(png_structp png, png_bytep new_row,
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png_uint_32 row_num, int pass);
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static void end_callback(png_structp png, png_infop info);
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void nspng_init(void)
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{
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/* generate colour lookup table for reducing to 8bpp */
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unsigned int red, green, blue;
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for (red = 0; red != 0xf; red++)
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for (green = 0; green != 0xf; green++)
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for (blue = 0; blue != 0xf; blue++)
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colour_table[red << 8 | green << 4 | blue] =
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colourtrans_return_colour_number_for_mode(
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blue << 28 | blue << 24 |
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green << 20 | green << 16 |
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red << 12 | red << 8, 21, 0);
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}
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void nspng_create(struct content *c)
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{
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c->data.png.sprite_area = 0;
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c->data.png.png = png_create_read_struct(PNG_LIBPNG_VER_STRING,
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0, 0, 0);
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assert(c->data.png.png != 0);
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c->data.png.info = png_create_info_struct(c->data.png.png);
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assert(c->data.png.info != 0);
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if (setjmp(png_jmpbuf(c->data.png.png))) {
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png_destroy_read_struct(&c->data.png.png,
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&c->data.png.info, 0);
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assert(0);
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}
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png_set_progressive_read_fn(c->data.png.png, c,
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info_callback, row_callback, end_callback);
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}
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void nspng_process_data(struct content *c, char *data, unsigned long size)
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{
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if (setjmp(png_jmpbuf(c->data.png.png))) {
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png_destroy_read_struct(&c->data.png.png,
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&c->data.png.info, 0);
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assert(0);
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}
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LOG(("data %p, size %li", data, size));
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png_process_data(c->data.png.png, c->data.png.info,
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data, size);
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c->size += size;
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}
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/**
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* info_callback -- PNG header has been completely received, prepare to process
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* image data
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*/
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void info_callback(png_structp png, png_infop info)
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{
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char *row, **row_pointers;
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int i, bit_depth, color_type, palette_size, log2bpp, interlace;
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unsigned int rowbytes, sprite_size;
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unsigned long width, height;
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struct content *c = png_get_progressive_ptr(png);
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os_palette *palette;
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os_sprite_palette *sprite_palette;
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osspriteop_area *sprite_area;
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osspriteop_header *sprite;
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png_color *png_palette;
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png_color_16 *png_background;
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png_color_16 default_background = {0, 0xffff, 0xffff, 0xffff, 0xffff};
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/* screen mode image result
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* any 8bpp or less (palette) 8bpp sprite
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* 8bpp or less 16 or 24bpp dither to 8bpp
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* 16 or 24bpp 16 or 24bpp sprite of same depth
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*/
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png_get_IHDR(png, info, &width, &height, &bit_depth,
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&color_type, &interlace, 0, 0);
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png_get_PLTE(png, info, &png_palette, &palette_size);
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if (interlace == PNG_INTERLACE_ADAM7)
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png_set_interlace_handling(png);
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if (png_get_bKGD(png, info, &png_background))
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png_set_background(png, png_background,
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PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
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else
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png_set_background(png, &default_background,
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PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
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xos_read_mode_variable(os_CURRENT_MODE, os_MODEVAR_LOG2_BPP,
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&log2bpp, 0);
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/* make sprite */
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sprite_size = sizeof(*sprite_area) + sizeof(*sprite);
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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sprite_size += 8 * 256 + height * ((width + 3) & ~3u);
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else if (log2bpp < 4)
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sprite_size += height * ((width + 3) & ~3u);
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else
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sprite_size += height * ((width + 3) & ~3u) * 4;
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sprite_area = xcalloc(sprite_size + 1000, 1);
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sprite_area->size = sprite_size;
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sprite_area->sprite_count = 1;
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sprite_area->first = sizeof(*sprite_area);
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sprite_area->used = sprite_size;
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sprite = (osspriteop_header *) (sprite_area + 1);
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sprite->size = sprite_size - sizeof(*sprite_area);
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strcpy(sprite->name, "png");
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sprite->height = height - 1;
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c->data.png.sprite_area = sprite_area;
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if (color_type == PNG_COLOR_TYPE_PALETTE) {
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/* making 256 colour sprite with PNG's palette */
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LOG(("palette with %i entries", palette_size));
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c->data.png.type = PNG_PALETTE;
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sprite->width = ((width + 3) & ~3u) / 4 - 1;
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sprite->left_bit = 0;
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sprite->right_bit = (8 * (((width - 1) % 4) + 1)) - 1;
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sprite->mask = sprite->image = sizeof(*sprite) + 8 * 256;
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sprite->mode = (os_mode) 21;
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sprite_palette = (os_sprite_palette *) (sprite + 1);
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for (i = 0; i != palette_size; i++)
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sprite_palette->entries[i].on =
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sprite_palette->entries[i].off =
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png_palette[i].blue << 24 |
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png_palette[i].green << 16 |
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png_palette[i].red << 8 | 16;
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/* make 8bpp */
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if (bit_depth < 8)
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png_set_packing(png);
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} else /*if (log2bpp < 4)*/ {
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/* making 256 colour sprite with no palette */
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LOG(("dithering down"));
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c->data.png.type = PNG_DITHER;
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sprite->width = ((width + 3) & ~3u) / 4 - 1;
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sprite->left_bit = 0;
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sprite->right_bit = (8 * (((width - 1) % 4) + 1)) - 1;
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sprite->mask = sprite->image = sizeof(*sprite);
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sprite->mode = (os_mode) 21;
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if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
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png_set_gray_1_2_4_to_8(png);
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if (color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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png_set_gray_to_rgb(png);
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if (bit_depth == 16)
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png_set_strip_16(png);
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} /*else {*/
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/* convert everything to 24-bit RGB (actually 32-bit) */
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/* LOG(("24-bit"));
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c->data.png.type = PNG_DEEP;
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_palette_to_rgb(png);
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if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
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png_set_gray_1_2_4_to_8(png);
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if (color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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png_set_gray_to_rgb(png);
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if (bit_depth == 16)
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png_set_strip_16(png);
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if (color_type == PNG_COLOR_TYPE_RGB)
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png_set_filler(png, 0xff, PNG_FILLER_AFTER);
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}*/
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png_read_update_info(png, info);
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c->data.png.rowbytes = rowbytes = png_get_rowbytes(png, info);
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c->data.png.sprite_image = ((char *) sprite) + sprite->image;
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c->width = width;
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c->height = height;
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LOG(("size %li * %li, bpp %i, rowbytes %lu", width,
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height, bit_depth, rowbytes));
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}
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void row_callback(png_structp png, png_bytep new_row,
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png_uint_32 row_num, int pass)
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{
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struct content *c = png_get_progressive_ptr(png);
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unsigned long i, rowbytes = c->data.png.rowbytes;
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int red, green, blue, alpha;
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char *row = c->data.png.sprite_image + row_num * ((c->width + 3) & ~3u);
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os_colour_number col;
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/*LOG(("PNG row %li, pass %i, row %p, new_row %p",
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row_num, pass, row, new_row));*/
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if (new_row == 0)
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return;
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if (c->data.png.type == PNG_PALETTE)
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png_progressive_combine_row(png, row, new_row);
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else if (c->data.png.type == PNG_DITHER) {
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for (i = 0; i * 3 != rowbytes; i++) {
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red = new_row[i * 3];
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green = new_row[i * 3 + 1];
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blue = new_row[i * 3 + 2];
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row[i] = colour_table[(red >> 4) << 8 |
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(green >> 4) << 4 |
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(blue >> 4)];
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}
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}
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}
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void end_callback(png_structp png, png_infop info)
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{
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struct content *c = png_get_progressive_ptr(png);
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LOG(("PNG end"));
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/*xosspriteop_save_sprite_file(osspriteop_USER_AREA, c->data.png.sprite_area,
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"png");*/
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}
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int nspng_convert(struct content *c, unsigned int width, unsigned int height)
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{
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png_destroy_read_struct(&c->data.png.png, &c->data.png.info, 0);
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c->title = xcalloc(100, 1);
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sprintf(c->title, "png image (%ux%u)", c->width, c->height);
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return 0;
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}
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void nspng_revive(struct content *c, unsigned int width, unsigned int height)
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{
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}
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void nspng_reformat(struct content *c, unsigned int width, unsigned int height)
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{
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}
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void nspng_destroy(struct content *c)
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{
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xfree(c->title);
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xfree(c->data.png.sprite_area);
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}
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void nspng_redraw(struct content *c, long x, long y,
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unsigned long width, unsigned long height)
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{
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/* TODO: scale to width, height */
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int size;
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osspriteop_trans_tab *table;
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xcolourtrans_generate_table_for_sprite(c->data.png.sprite_area,
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(osspriteop_id) (c->data.png.sprite_area + 1),
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colourtrans_CURRENT_MODE, colourtrans_CURRENT_PALETTE,
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0, colourtrans_GIVEN_SPRITE, 0, 0, &size);
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table = xcalloc(size, 1);
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xcolourtrans_generate_table_for_sprite(c->data.png.sprite_area,
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(osspriteop_id) (c->data.png.sprite_area + 1),
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colourtrans_CURRENT_MODE, colourtrans_CURRENT_PALETTE,
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table, colourtrans_GIVEN_SPRITE, 0, 0, 0);
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xosspriteop_put_sprite_scaled(osspriteop_PTR,
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c->data.png.sprite_area,
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(osspriteop_id) (c->data.png.sprite_area + 1),
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x, y, 0, 0, table);
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xfree(table);
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}
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