ref: 3c15b141e07a099bbb33e092d594efa95ea8074e
dir: /src/gfx/makepng.c/
/* * Copyright © 2013 stag019 <stag019@gmail.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <stdlib.h> #include <string.h> #include "gfx/main.h" void input_png_file(const struct Options opts, struct PNGImage *img) { FILE *f; int i, y, num_trans; bool has_palette = false; png_byte *trans_alpha; png_color_16 *trans_values; bool *full_alpha; png_color *palette; f = fopen(opts.infile, "rb"); if (!f) err(1, "Opening input png file '%s' failed", opts.infile); img->png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); if (!img->png) errx(1, "Creating png structure failed"); img->info = png_create_info_struct(img->png); if (!img->info) errx(1, "Creating png info structure failed"); /* TODO: Better error handling here? */ if (setjmp(png_jmpbuf(img->png))) exit(1); png_init_io(img->png, f); png_read_info(img->png, img->info); img->width = png_get_image_width(img->png, img->info); img->height = png_get_image_height(img->png, img->info); img->depth = png_get_bit_depth(img->png, img->info); img->type = png_get_color_type(img->png, img->info); if (img->type & PNG_COLOR_MASK_ALPHA) png_set_strip_alpha(img->png); if (img->depth != depth) { if (opts.verbose) { warnx("Image bit depth is not %i (is %i).", depth, img->depth); } } if (img->type == PNG_COLOR_TYPE_GRAY) { if (img->depth < 8) png_set_expand_gray_1_2_4_to_8(img->png); png_set_gray_to_rgb(img->png); } else { if (img->depth < 8) png_set_expand_gray_1_2_4_to_8(img->png); has_palette = png_get_PLTE(img->png, img->info, &palette, &colors); } if (png_get_tRNS(img->png, img->info, &trans_alpha, &num_trans, &trans_values)) { if (img->type == PNG_COLOR_TYPE_PALETTE) { full_alpha = malloc(sizeof(bool) * num_trans); for (i = 0; i < num_trans; i++) { if (trans_alpha[i] > 0) full_alpha[i] = false; else full_alpha[i] = true; } for (i = 0; i < num_trans; i++) { if (full_alpha[i]) { palette[i].red = 0xFF; palette[i].green = 0x00; palette[i].blue = 0xFF; /* * Set to the lightest color in the * palette. */ } } free(full_alpha); } else { /* Set to the lightest color in the image. */ } png_free_data(img->png, img->info, PNG_FREE_TRNS, -1); } if (has_palette) { /* Make sure palette only has the amount of colors you want. */ } else { /* * Eventually when this copies colors from the image itself, * make sure order is lightest to darkest. */ palette = malloc(sizeof(png_color) * colors); if (strcmp(opts.infile, "rgb.png") == 0) { palette[0].red = 0xFF; palette[0].green = 0xEF; palette[0].blue = 0xFF; palette[1].red = 0xF7; palette[1].green = 0xF7; palette[1].blue = 0x8C; palette[2].red = 0x94; palette[2].green = 0x94; palette[2].blue = 0xC6; palette[3].red = 0x39; palette[3].green = 0x39; palette[3].blue = 0x84; } else { palette[0].red = 0xFF; palette[0].green = 0xFF; palette[0].blue = 0xFF; palette[1].red = 0xA9; palette[1].green = 0xA9; palette[1].blue = 0xA9; palette[2].red = 0x55; palette[2].green = 0x55; palette[2].blue = 0x55; palette[3].red = 0x00; palette[3].green = 0x00; palette[3].blue = 0x00; } } /* * Also unfortunately, this sets it at 8 bit, and I can't find any * option to reduce to 2 or 1 bit. */ #if PNG_LIBPNG_VER < 10402 png_set_dither(img->png, palette, colors, colors, NULL, 1); #else png_set_quantize(img->png, palette, colors, colors, NULL, 1); #endif if (!has_palette) { png_set_PLTE(img->png, img->info, palette, colors); free(palette); } /* * If other useless chunks exist (sRGB, bKGD, pHYs, gAMA, cHRM, iCCP, * etc.) offer to remove? */ png_read_update_info(img->png, img->info); img->data = malloc(sizeof(png_byte *) * img->height); for (y = 0; y < img->height; y++) img->data[y] = malloc(png_get_rowbytes(img->png, img->info)); png_read_image(img->png, img->data); png_read_end(img->png, img->info); fclose(f); } void get_text(struct PNGImage *png) { png_text *text; int i, numtxts, numremoved; png_get_text(png->png, png->info, &text, &numtxts); for (i = 0; i < numtxts; i++) { if (strcmp(text[i].key, "h") == 0 && !*text[i].text) { png->horizontal = true; png_free_data(png->png, png->info, PNG_FREE_TEXT, i); } else if (strcmp(text[i].key, "x") == 0) { png->trim = strtoul(text[i].text, NULL, 0); png_free_data(png->png, png->info, PNG_FREE_TEXT, i); } else if (strcmp(text[i].key, "t") == 0) { png->mapfile = text[i].text; png_free_data(png->png, png->info, PNG_FREE_TEXT, i); } else if (strcmp(text[i].key, "T") == 0 && !*text[i].text) { png->mapout = true; png_free_data(png->png, png->info, PNG_FREE_TEXT, i); } else if (strcmp(text[i].key, "p") == 0) { png->palfile = text[i].text; png_free_data(png->png, png->info, PNG_FREE_TEXT, i); } else if (strcmp(text[i].key, "P") == 0 && !*text[i].text) { png->palout = true; png_free_data(png->png, png->info, PNG_FREE_TEXT, i); } } /* * TODO: Remove this and simply change the warning function not to warn * instead. */ for (i = 0, numremoved = 0; i < numtxts; i++) { if (text[i].key == NULL) numremoved++; text[i].key = text[i + numremoved].key; text[i].text = text[i + numremoved].text; text[i].compression = text[i + numremoved].compression; } png_set_text(png->png, png->info, text, numtxts - numremoved); } void set_text(const struct PNGImage *png) { png_text *text; char buffer[3]; text = malloc(sizeof(png_text)); if (png->horizontal) { text[0].key = "h"; text[0].text = ""; text[0].compression = PNG_TEXT_COMPRESSION_NONE; png_set_text(png->png, png->info, text, 1); } if (png->trim) { text[0].key = "x"; snprintf(buffer, 3, "%d", png->trim); text[0].text = buffer; text[0].compression = PNG_TEXT_COMPRESSION_NONE; png_set_text(png->png, png->info, text, 1); } if (*png->mapfile) { text[0].key = "t"; text[0].text = ""; text[0].compression = PNG_TEXT_COMPRESSION_NONE; png_set_text(png->png, png->info, text, 1); } if (png->mapout) { text[0].key = "T"; text[0].text = ""; text[0].compression = PNG_TEXT_COMPRESSION_NONE; png_set_text(png->png, png->info, text, 1); } if (*png->palfile) { text[0].key = "p"; text[0].text = ""; text[0].compression = PNG_TEXT_COMPRESSION_NONE; png_set_text(png->png, png->info, text, 1); } if (png->palout) { text[0].key = "P"; text[0].text = ""; text[0].compression = PNG_TEXT_COMPRESSION_NONE; png_set_text(png->png, png->info, text, 1); } free(text); } void output_png_file(const struct Options opts, const struct PNGImage *png) { FILE *f; char *outfile; png_struct *img; /* * TODO: Variable outfile is for debugging purposes. Eventually, * opts.infile will be used directly. */ if (opts.debug) { outfile = malloc(strlen(opts.infile) + 5); strcpy(outfile, opts.infile); strcat(outfile, ".out"); } else { outfile = opts.infile; } f = fopen(outfile, "wb"); if (!f) err(1, "Opening output png file '%s' failed", outfile); img = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); if (!img) errx(1, "Creating png structure failed"); /* TODO: Better error handling here? */ if (setjmp(png_jmpbuf(img))) exit(1); png_init_io(img, f); png_write_info(img, png->info); png_write_image(img, png->data); png_write_end(img, NULL); fclose(f); if (opts.debug) free(outfile); } void free_png_data(const struct PNGImage *png) { int y; for (y = 0; y < png->height; y++) free(png->data[y]); free(png->data); }