mirror of https://github.com/OpenRCT2/OpenRCT2.git
251 lines
6.9 KiB
C
251 lines
6.9 KiB
C
#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
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/*****************************************************************************
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* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
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*
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* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
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* For more information, visit https://github.com/OpenRCT2/OpenRCT2
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*
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* OpenRCT2 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, either version 3 of the License, or
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* (at your option) any later version.
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*
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* A full copy of the GNU General Public License can be found in licence.txt
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*****************************************************************************/
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#pragma endregion
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#include <png.h>
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#include "image_io.h"
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static void my_png_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
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static void my_png_write_data(png_structp png_ptr, png_bytep data, png_size_t length);
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static void my_png_flush(png_structp png_ptr);
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bool image_io_png_read(uint8 **pixels, uint32 *width, uint32 *height, const utf8 *path)
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{
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png_structp png_ptr;
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png_infop info_ptr;
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unsigned int sig_read = 0;
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// Setup PNG structures
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png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (png_ptr == NULL) {
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return false;
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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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png_destroy_read_struct(&png_ptr, NULL, NULL);
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return false;
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}
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// Open PNG file
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SDL_RWops *fp = SDL_RWFromFile(path, "rb");
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if (fp == NULL) {
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return false;
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}
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// Set error handling
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if (setjmp(png_jmpbuf(png_ptr))) {
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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SDL_RWclose(fp);
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return false;
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}
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// Setup png reading
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png_set_read_fn(png_ptr, fp, my_png_read_data);
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png_set_sig_bytes(png_ptr, sig_read);
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// To simplify the reading process, convert 4-16 bit data to 24-32 bit data
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png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_PACKING | PNG_TRANSFORM_EXPAND, NULL);
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// Read header
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png_uint_32 pngWidth, pngHeight;
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int bit_depth, colour_type, interlace_type;
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png_get_IHDR(png_ptr, info_ptr, &pngWidth, &pngHeight, &bit_depth, &colour_type, &interlace_type, NULL, NULL);
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// Read pixels as 32bpp RGBA data
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png_size_t rowBytes = png_get_rowbytes(png_ptr, info_ptr);
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png_bytepp rowPointers = png_get_rows(png_ptr, info_ptr);
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uint8 *pngPixels = (uint8*)malloc(pngWidth * pngHeight * 4);
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uint8 *dst = pngPixels;
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if (colour_type == PNG_COLOR_TYPE_RGB) {
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// 24-bit PNG (no alpha)
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assert(rowBytes == pngWidth * 3);
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for (png_uint_32 i = 0; i < pngHeight; i++) {
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uint8 *src = rowPointers[i];
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for (png_uint_32 x = 0; x < pngWidth; x++) {
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = 255;
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}
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}
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} else {
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// 32-bit PNG (with alpha)
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assert(rowBytes == pngWidth * 4);
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for (png_uint_32 i = 0; i < pngHeight; i++) {
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memcpy(dst, rowPointers[i], rowBytes);
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dst += rowBytes;
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}
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}
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// Close the PNG
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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SDL_RWclose(fp);
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// Return the output data
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*pixels = (uint8*)pngPixels;
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if (width != NULL) *width = pngWidth;
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if (height != NULL) *height = pngHeight;
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return true;
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}
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bool image_io_png_write(const rct_drawpixelinfo *dpi, const rct_palette *palette, const utf8 *path)
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{
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// Get image size
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int stride = dpi->width + dpi->pitch;
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// Setup PNG
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png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (png_ptr == NULL) {
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return false;
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}
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (info_ptr == NULL) {
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png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
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return false;
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}
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png_colorp png_palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH * sizeof(png_color));
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for (int i = 0; i < 256; i++) {
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const rct_palette_entry *entry = &palette->entries[i];
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png_palette[i].blue = entry->blue;
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png_palette[i].green = entry->green;
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png_palette[i].red = entry->red;
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}
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png_set_PLTE(png_ptr, info_ptr, png_palette, PNG_MAX_PALETTE_LENGTH);
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// Open file for writing
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SDL_RWops *file = SDL_RWFromFile(path, "wb");
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if (file == NULL) {
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png_free(png_ptr, png_palette);
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png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
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return false;
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}
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png_set_write_fn(png_ptr, file, my_png_write_data, my_png_flush);
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// Set error handler
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if (setjmp(png_jmpbuf(png_ptr))) {
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png_free(png_ptr, png_palette);
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png_destroy_write_struct(&png_ptr, &info_ptr);
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SDL_RWclose(file);
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return false;
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}
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// Write header
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png_set_IHDR(
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png_ptr, info_ptr, dpi->width, dpi->height, 8,
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PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT
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);
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png_byte transparentIndex = 0;
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png_set_tRNS(png_ptr, info_ptr, &transparentIndex, 1, NULL);
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png_write_info(png_ptr, info_ptr);
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// Write pixels
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uint8 *bits = dpi->bits;
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for (int y = 0; y < dpi->height; y++) {
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png_write_row(png_ptr, (png_byte *)bits);
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bits += stride;
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}
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// Finish
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png_write_end(png_ptr, NULL);
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SDL_RWclose(file);
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png_free(png_ptr, png_palette);
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png_destroy_write_struct(&png_ptr, &info_ptr);
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return true;
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}
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static void image_io_png_warning(png_structp png_ptr, const char *b)
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{
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log_warning(b);
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}
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static void image_io_png_error(png_structp png_ptr, const char *b)
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{
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log_error(b);
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}
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bool image_io_png_write_32bpp(sint32 width, sint32 height, const void *pixels, const utf8 *path)
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{
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// Setup PNG
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png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, image_io_png_error, image_io_png_warning);
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if (png_ptr == NULL) {
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return false;
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}
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (info_ptr == NULL) {
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png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
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return false;
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}
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// Open file for writing
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SDL_RWops *file = SDL_RWFromFile(path, "wb");
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if (file == NULL) {
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png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
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return false;
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}
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png_set_write_fn(png_ptr, file, my_png_write_data, my_png_flush);
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// Set error handler
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if (setjmp(png_jmpbuf(png_ptr))) {
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png_destroy_write_struct(&png_ptr, &info_ptr);
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SDL_RWclose(file);
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return false;
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}
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// Write header
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png_set_IHDR(
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png_ptr, info_ptr, width, height, 8,
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PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT
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);
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png_write_info(png_ptr, info_ptr);
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// Write pixels
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uint8 *bits = (uint8*)pixels;
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for (int y = 0; y < height; y++) {
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png_write_row(png_ptr, (png_byte *)bits);
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bits += width * 4;
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}
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// Finish
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png_write_end(png_ptr, NULL);
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SDL_RWclose(file);
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png_destroy_write_struct(&png_ptr, &info_ptr);
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return true;
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}
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static void my_png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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{
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SDL_RWops *file = (SDL_RWops*)png_get_io_ptr(png_ptr);
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SDL_RWread(file, data, length, 1);
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}
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static void my_png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
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{
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SDL_RWops *file = (SDL_RWops*)png_get_io_ptr(png_ptr);
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SDL_RWwrite(file, data, length, 1);
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}
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static void my_png_flush(png_structp png_ptr)
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{
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}
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