/* * Copyright 2009 Daniel Silverstone <dsilvers@netsurf-browser.org> * * This file is part of NetSurf, http://www.netsurf-browser.org/ * * NetSurf is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * NetSurf is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <stdbool.h> #include <errno.h> #include <stdio.h> #include <png.h> #include <stdlib.h> #if PNG_LIBPNG_VER < 10209 #define png_set_expand_gray_1_2_4_to_8(png) png_set_gray_1_2_4_to_8(png) #endif static png_structp png; static png_infop info; static int interlace; static size_t rowbytes; static int raw_width, raw_height; static int rowstride; static unsigned char *bitmap_data; static bool is_cursor = true; static int raw_hot_x, raw_hot_y; #define WIDTH (is_cursor?raw_width-1:raw_width) #define HEIGHT (is_cursor?raw_height-1:raw_height) #define HOT_X (is_cursor?raw_hot_x-1:0) #define HOT_Y (is_cursor?raw_hot_y-1:0) #define REAL(v) (is_cursor?v+1:v) #define PPIX_AT(x,y) ((bitmap_data + (rowstride * y)) + (x * 4)) #define R_OFF 2 #define G_OFF 1 #define B_OFF 0 #define A_OFF 3 #define R_AT(x,y) *(PPIX_AT(x,y) + R_OFF) #define G_AT(x,y) *(PPIX_AT(x,y) + G_OFF) #define B_AT(x,y) *(PPIX_AT(x,y) + B_OFF) #define A_AT(x,y) *(PPIX_AT(x,y) + A_OFF) static void info_callback(png_structp png, png_infop info); static void row_callback(png_structp png, png_bytep new_row, png_uint_32 row_num, int pass); static void end_callback(png_structp png, png_infop info); static void usage(void) { fprintf(stderr, "usage: fb_convert_image input.png output.inc varname\n"); } static void info_callback(png_structp png, png_infop info); static void row_callback(png_structp png, png_bytep new_row, png_uint_32 row_num, int pass); static void end_callback(png_structp png, png_infop info); static void detect_hotspot(void) { int i; int greenpixels = 0; for (i = 0; i < raw_width; ++i) { if (A_AT(i, 0) == 255) { if (G_AT(i, 0) == 255) { greenpixels++; raw_hot_x = i; } if ((B_AT(i, 0) != 0) || (R_AT(i, 0) != 0)) { is_cursor = false; return; } } else if (A_AT(i, 0) != 0) { is_cursor = false; return; } } if (greenpixels != 1) { is_cursor = false; return; } for (i = 0; i < raw_height; ++i) { if (A_AT(0, i) == 255) { if (G_AT(0, i) == 255) { greenpixels++; raw_hot_y = i; } if ((B_AT(0, i) != 0) || (R_AT(0, i) != 0)) { is_cursor = false; return; } } else if (A_AT(0, i) != 0) { is_cursor = false; return; } } if (greenpixels != 2) { is_cursor = false; return; } printf(" Pointer detected. Adjusted hotspot at %d, %d (0-based)\n", raw_hot_x - 1, raw_hot_y - 1); } int main(int argc, char **argv) { FILE *f; unsigned char buffer[1024]; int br; int x, y, c; if (argc != 4) { usage(); return 1; } printf(" CONVERT: %s (%s)\n", argv[1], argv[3]); png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0); info = png_create_info_struct(png); png_set_progressive_read_fn(png, NULL, info_callback, row_callback, end_callback); f = fopen(argv[1], "rb"); if (f == NULL) { printf(" Unable to open %s\n", argv[1]); return 1; } do { br = fread(buffer, 1, 1024, f); if (br > 0) { png_process_data(png, info, buffer, br); } } while (br > 0); if (br < 0) { printf("Error reading input: %s\n", strerror(errno)); fclose(f); return 1; } fclose(f); detect_hotspot(); f = fopen(argv[2], "w"); if (f == NULL) { printf(" Unable to open %s\n", argv[2]); return 2; } fprintf(f, "/* This file is auto-generated from %s\n", argv[1]); fprintf(f, " *\n * Do not edit this file directly.\n */\n\n"); fprintf(f, "#include <sys/types.h>\n\n"); fprintf(f, "#include <stdint.h>\n\n"); fprintf(f, "#include <stdbool.h>\n\n"); fprintf(f, "#include <libnsfb.h>\n\n"); fprintf(f, "#include \"desktop/plot_style.h\"\n"); fprintf(f, "#include \"framebuffer/gui.h\"\n"); fprintf(f, "#include \"framebuffer/fbtk.h\"\n\n"); fprintf(f, "static uint8_t %s_pixdata[] = {\n", argv[3]); for (y = 0; y < HEIGHT; ++y) { unsigned char *rowptr = bitmap_data + (rowstride * y); if (is_cursor) { /* If it's a cursor, skip one row and one column */ rowptr += rowstride + 4; } fprintf(f, "\t"); for (x = 0; x < WIDTH; ++x) { for (c = 0; c < 4; ++c) { unsigned char b = *rowptr++; fprintf(f, "0x%02x, ", b); } } fprintf(f, "\n"); } fprintf(f, "};\n\n"); fprintf(f, "struct fbtk_bitmap %s = {\n", argv[3]); fprintf(f, "\t.width\t\t= %d,\n", WIDTH); fprintf(f, "\t.height\t\t= %d,\n", HEIGHT); fprintf(f, "\t.hot_x\t\t= %d,\n", HOT_X); fprintf(f, "\t.hot_y\t\t= %d,\n", HOT_Y); fprintf(f, "\t.pixdata\t= %s_pixdata,\n", argv[3]); fprintf(f, "};\n\n"); fclose(f); return 0; } static void info_callback(png_structp png, png_infop info) { int bit_depth, color_type, interlace, intent; double gamma; unsigned long width, height; /* Read the PNG details */ png_get_IHDR(png, info, &width, &height, &bit_depth, &color_type, &interlace, 0, 0); /* Set up our transformations */ if (color_type == PNG_COLOR_TYPE_PALETTE) png_set_palette_to_rgb(png); if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) png_set_expand_gray_1_2_4_to_8(png); if (png_get_valid(png, info, PNG_INFO_tRNS)) png_set_tRNS_to_alpha(png); if (bit_depth == 16) png_set_strip_16(png); if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) png_set_gray_to_rgb(png); if (!(color_type & PNG_COLOR_MASK_ALPHA)) png_set_filler(png, 0xff, PNG_FILLER_AFTER); /* gamma correction - we use 2.2 as our screen gamma * this appears to be correct (at least in respect to !Browse) * see http://www.w3.org/Graphics/PNG/all_seven.html for a test case */ if (png_get_sRGB(png, info, &intent)) png_set_gamma(png, 2.2, 0.45455); else { if (png_get_gAMA(png, info, &gamma)) png_set_gamma(png, 2.2, gamma); else png_set_gamma(png, 2.2, 0.45455); } png_read_update_info(png, info); rowbytes = png_get_rowbytes(png, info); interlace = (interlace == PNG_INTERLACE_ADAM7); raw_width = width; raw_height = height; rowstride = raw_width * 4; bitmap_data = malloc(rowstride * raw_height); } static unsigned int interlace_start[8] = {0, 16, 0, 8, 0, 4, 0}; static unsigned int interlace_step[8] = {28, 28, 12, 12, 4, 4, 0}; static unsigned int interlace_row_start[8] = {0, 0, 4, 0, 2, 0, 1}; static unsigned int interlace_row_step[8] = {8, 8, 8, 4, 4, 2, 2}; static void row_callback(png_structp png, png_bytep new_row, png_uint_32 row_num, int pass) { unsigned long i, j; unsigned int start, step; unsigned char *row = bitmap_data + (rowstride * row_num); if (new_row == 0) return; if (interlace) { start = interlace_start[pass]; step = interlace_step[pass]; row_num = interlace_row_start[pass] + interlace_row_step[pass] * row_num; /* Copy the data to our current row taking interlacing * into consideration */ row = bitmap_data + (rowstride * row_num); for (j = 0, i = start; i < rowbytes; i += step) { row[i++] = new_row[j++]; row[i++] = new_row[j++]; row[i++] = new_row[j++]; row[i++] = new_row[j++]; } } else { memcpy(row, new_row, rowbytes); } } static void end_callback(png_structp png, png_infop info) { } /* * Local Variables: * c-basic-offset:8 * End: */