mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-24 15:29:45 +03:00
308 lines
9.1 KiB
C
308 lines
9.1 KiB
C
/*
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* Copyright 2009 Daniel Silverstone <dsilvers@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <errno.h>
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#include <stdio.h>
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#include <png.h>
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#include <stdlib.h>
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static png_structp png;
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static png_infop info;
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static int interlace;
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static size_t rowbytes;
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static int raw_width, raw_height;
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static int rowstride;
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static unsigned char *bitmap_data;
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static bool is_cursor = true;
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static int raw_hot_x, raw_hot_y;
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#define WIDTH (is_cursor?raw_width-1:raw_width)
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#define HEIGHT (is_cursor?raw_height-1:raw_height)
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#define HOT_X (is_cursor?raw_hot_x-1:0)
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#define HOT_Y (is_cursor?raw_hot_y-1:0)
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#define REAL(v) (is_cursor?v+1:v)
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#define PPIX_AT(x,y) ((bitmap_data + (rowstride * y)) + (x * 4))
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#define R_OFF 2
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#define G_OFF 1
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#define B_OFF 0
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#define A_OFF 3
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#define R_AT(x,y) *(PPIX_AT(x,y) + R_OFF)
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#define G_AT(x,y) *(PPIX_AT(x,y) + G_OFF)
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#define B_AT(x,y) *(PPIX_AT(x,y) + B_OFF)
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#define A_AT(x,y) *(PPIX_AT(x,y) + A_OFF)
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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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static void
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usage(void)
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{
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fprintf(stderr, "usage: fb_convert_image input.png output.inc varname\n");
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}
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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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static void
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detect_hotspot(void)
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{
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int i;
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int greenpixels = 0;
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for (i = 0; i < raw_width; ++i) {
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if (A_AT(i, 0) == 255) {
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if (G_AT(i, 0) == 255) {
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greenpixels++;
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raw_hot_x = i;
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}
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if ((B_AT(i, 0) != 0) || (R_AT(i, 0) != 0)) {
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is_cursor = false;
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return;
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}
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} else if (A_AT(i, 0) != 0) {
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is_cursor = false;
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return;
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}
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}
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if (greenpixels != 1) {
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is_cursor = false;
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return;
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}
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for (i = 0; i < raw_height; ++i) {
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if (A_AT(0, i) == 255) {
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if (G_AT(0, i) == 255) {
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greenpixels++;
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raw_hot_y = i;
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}
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if ((B_AT(0, i) != 0) || (R_AT(0, i) != 0)) {
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is_cursor = false;
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return;
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}
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} else if (A_AT(0, i) != 0) {
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is_cursor = false;
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return;
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}
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}
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if (greenpixels != 2) {
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is_cursor = false;
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return;
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}
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printf(" Pointer detected. Adjusted hotspot at %d, %d (0-based)\n",
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raw_hot_x - 1, raw_hot_y - 1);
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}
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int
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main(int argc, char **argv)
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{
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FILE *f;
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unsigned char buffer[1024];
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int br;
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int x, y, c;
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if (argc != 4) {
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usage();
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return 1;
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}
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printf(" CONVERT: %s (%s)\n", argv[1], argv[3]);
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png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
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info = png_create_info_struct(png);
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png_set_progressive_read_fn(png, NULL, info_callback, row_callback, end_callback);
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f = fopen(argv[1], "rb");
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if (f == NULL) {
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printf(" Unable to open %s\n", argv[1]);
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return 1;
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}
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do {
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br = fread(buffer, 1, 1024, f);
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if (br > 0) {
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png_process_data(png, info, buffer, br);
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}
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} while (br > 0);
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if (br < 0) {
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printf("Error reading input: %s\n", strerror(errno));
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return 1;
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}
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fclose(f);
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detect_hotspot();
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f = fopen(argv[2], "w");
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if (f == NULL) {
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printf(" Unable to open %s\n", argv[2]);
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return 2;
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}
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fprintf(f, "/* This file is auto-generated from %s\n", argv[1]);
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fprintf(f, " *\n * Do not edit this file directly.\n */\n\n");
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fprintf(f, "#include <sys/types.h>\n\n");
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fprintf(f, "#include <stdint.h>\n\n");
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fprintf(f, "#include <stdbool.h>\n\n");
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fprintf(f, "#include \"framebuffer/bitmap.h\"\n\n");
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fprintf(f, "static uint8_t %s_pixdata[] = {\n", argv[3]);
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for (y = 0; y < HEIGHT; ++y) {
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unsigned char *rowptr = bitmap_data + (rowstride * y);
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if (is_cursor) {
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/* If it's a cursor, skip one row and one column */
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rowptr += rowstride + 4;
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}
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fprintf(f, "\t");
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for (x = 0; x < WIDTH; ++x) {
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for (c = 0; c < 4; ++c) {
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unsigned char b = *rowptr++;
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fprintf(f, "0x%02x, ", b);
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}
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}
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fprintf(f, "\n");
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}
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fprintf(f, "};\n\n");
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fprintf(f, "struct bitmap %s = {\n", argv[3]);
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fprintf(f, "\t.width\t\t= %d,\n", WIDTH);
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fprintf(f, "\t.height\t\t= %d,\n", HEIGHT);
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fprintf(f, "\t.hot_x\t\t= %d,\n", HOT_X);
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fprintf(f, "\t.hot_y\t\t= %d,\n", HOT_Y);
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fprintf(f, "\t.pixdata\t= %s_pixdata,\n", argv[3]);
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fprintf(f, "};\n\n");
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fclose(f);
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return 0;
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}
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static void
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info_callback(png_structp png, png_infop info)
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{
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int bit_depth, color_type, interlace, intent;
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double gamma;
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unsigned long width, height;
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/* Read the PNG details */
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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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/* Set up our transformations */
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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 (png_get_valid(png, info, PNG_INFO_tRNS))
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png_set_tRNS_to_alpha(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_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 (!(color_type & PNG_COLOR_MASK_ALPHA))
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png_set_filler(png, 0xff, PNG_FILLER_AFTER);
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/* gamma correction - we use 2.2 as our screen gamma
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* this appears to be correct (at least in respect to !Browse)
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* see http://www.w3.org/Graphics/PNG/all_seven.html for a test case
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*/
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if (png_get_sRGB(png, info, &intent))
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png_set_gamma(png, 2.2, 0.45455);
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else {
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if (png_get_gAMA(png, info, &gamma))
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png_set_gamma(png, 2.2, gamma);
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else
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png_set_gamma(png, 2.2, 0.45455);
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}
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png_read_update_info(png, info);
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rowbytes = png_get_rowbytes(png, info);
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interlace = (interlace == PNG_INTERLACE_ADAM7);
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raw_width = width;
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raw_height = height;
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rowstride = raw_width * 4;
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bitmap_data = malloc(rowstride * raw_height);
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}
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static unsigned int interlace_start[8] = {0, 16, 0, 8, 0, 4, 0};
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static unsigned int interlace_step[8] = {28, 28, 12, 12, 4, 4, 0};
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static unsigned int interlace_row_start[8] = {0, 0, 4, 0, 2, 0, 1};
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static unsigned int interlace_row_step[8] = {8, 8, 8, 4, 4, 2, 2};
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static void
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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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unsigned long i, j;
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unsigned int start, step;
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unsigned char *row = bitmap_data + (rowstride * row_num);
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if (new_row == 0)
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return;
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if (interlace) {
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start = interlace_start[pass];
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step = interlace_step[pass];
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row_num = interlace_row_start[pass] +
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interlace_row_step[pass] * row_num;
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/* Copy the data to our current row taking interlacing
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* into consideration */
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row = bitmap_data + (rowstride * row_num);
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for (j = 0, i = start; i < rowbytes; i += step) {
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row[i++] = new_row[j++];
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row[i++] = new_row[j++];
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row[i++] = new_row[j++];
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row[i++] = new_row[j++];
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}
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} else {
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memcpy(row, new_row, rowbytes);
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}
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}
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static void
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end_callback(png_structp png, png_infop info)
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{
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}
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/*
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* Local Variables:
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* c-basic-offset:8
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* End:
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*/
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