mirror of
https://github.com/Ninjdai1/pokeemerald.git
synced 2024-11-16 11:37:40 +01:00
251 lines
7.3 KiB
C
251 lines
7.3 KiB
C
// Copyright (c) 2015 YamaArashi
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#include <stdio.h>
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#include <setjmp.h>
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#include <png.h>
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#include "global.h"
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#include "convert_png.h"
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#include "gfx.h"
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static FILE *PngReadOpen(char *path, png_structp *pngStruct, png_infop *pngInfo)
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{
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FILE *fp = fopen(path, "rb");
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if (fp == NULL)
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FATAL_ERROR("Failed to open \"%s\" for reading.\n", path);
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unsigned char sig[8];
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if (fread(sig, 8, 1, fp) != 1)
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FATAL_ERROR("Failed to read PNG signature from \"%s\".\n", path);
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if (png_sig_cmp(sig, 0, 8))
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FATAL_ERROR("\"%s\" does not have a valid PNG signature.\n", path);
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png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!png_ptr)
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FATAL_ERROR("Failed to create PNG read struct.\n");
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr)
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FATAL_ERROR("Failed to create PNG info struct.\n");
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if (setjmp(png_jmpbuf(png_ptr)))
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FATAL_ERROR("Failed to init I/O for reading \"%s\".\n", path);
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png_init_io(png_ptr, fp);
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png_set_sig_bytes(png_ptr, 8);
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png_read_info(png_ptr, info_ptr);
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*pngStruct = png_ptr;
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*pngInfo = info_ptr;
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return fp;
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}
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static unsigned char *ConvertBitDepth(unsigned char *src, int srcBitDepth, int destBitDepth, int numPixels)
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{
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// Round the number of bits up to the next 8 and divide by 8 to get the number of bytes.
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int srcSize = ((numPixels * srcBitDepth + 7) & ~7) / 8;
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int destSize = ((numPixels * destBitDepth + 7) & ~7) / 8;
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unsigned char *output = calloc(destSize, 1);
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unsigned char *dest = output;
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int i;
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int j;
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int destBit = 8 - destBitDepth;
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for (i = 0; i < srcSize; i++)
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{
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unsigned char srcByte = src[i];
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for (j = 8 - srcBitDepth; j >= 0; j -= srcBitDepth)
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{
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unsigned char pixel = (srcByte >> j) % (1 << destBitDepth);
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*dest |= pixel << destBit;
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destBit -= destBitDepth;
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if (destBit < 0)
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{
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dest++;
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destBit = 8 - destBitDepth;
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}
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}
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}
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return output;
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}
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void ReadPng(char *path, struct Image *image)
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{
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png_structp png_ptr;
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png_infop info_ptr;
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FILE *fp = PngReadOpen(path, &png_ptr, &info_ptr);
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int bit_depth = png_get_bit_depth(png_ptr, info_ptr);
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int color_type = png_get_color_type(png_ptr, info_ptr);
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if (color_type != PNG_COLOR_TYPE_GRAY && color_type != PNG_COLOR_TYPE_PALETTE)
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FATAL_ERROR("\"%s\" has an unsupported color type.\n", path);
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// Check if the image has a palette so that we can tell if the colors need to be inverted later.
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// Don't read the palette because it's not needed for now.
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image->hasPalette = (color_type == PNG_COLOR_TYPE_PALETTE);
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image->width = png_get_image_width(png_ptr, info_ptr);
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image->height = png_get_image_height(png_ptr, info_ptr);
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int rowbytes = png_get_rowbytes(png_ptr, info_ptr);
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image->pixels = malloc(image->height * rowbytes);
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if (image->pixels == NULL)
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FATAL_ERROR("Failed to allocate pixel buffer.\n");
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png_bytepp row_pointers = malloc(image->height * sizeof(png_bytep));
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if (row_pointers == NULL)
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FATAL_ERROR("Failed to allocate row pointers.\n");
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for (int i = 0; i < image->height; i++)
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row_pointers[i] = (png_bytep)(image->pixels + (i * rowbytes));
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if (setjmp(png_jmpbuf(png_ptr)))
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FATAL_ERROR("Error reading from \"%s\".\n", path);
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png_read_image(png_ptr, row_pointers);
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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free(row_pointers);
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fclose(fp);
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if (bit_depth != image->bitDepth && image->tilemap.data.affine == NULL)
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{
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unsigned char *src = image->pixels;
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if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 && bit_depth != 8)
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FATAL_ERROR("Bit depth of image must be 1, 2, 4, or 8.\n");
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image->pixels = ConvertBitDepth(image->pixels, bit_depth, image->bitDepth, image->width * image->height);
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free(src);
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}
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}
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void ReadPngPalette(char *path, struct Palette *palette)
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{
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png_structp png_ptr;
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png_infop info_ptr;
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png_colorp colors;
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int numColors;
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FILE *fp = PngReadOpen(path, &png_ptr, &info_ptr);
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if (png_get_color_type(png_ptr, info_ptr) != PNG_COLOR_TYPE_PALETTE)
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FATAL_ERROR("The image \"%s\" does not contain a palette.\n", path);
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if (png_get_PLTE(png_ptr, info_ptr, &colors, &numColors) != PNG_INFO_PLTE)
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FATAL_ERROR("Failed to retrieve palette from \"%s\".\n", path);
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if (numColors > 256)
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FATAL_ERROR("Images with more than 256 colors are not supported.\n");
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palette->numColors = numColors;
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for (int i = 0; i < numColors; i++) {
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palette->colors[i].red = colors[i].red;
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palette->colors[i].green = colors[i].green;
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palette->colors[i].blue = colors[i].blue;
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}
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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fclose(fp);
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}
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void SetPngPalette(png_structp png_ptr, png_infop info_ptr, struct Palette *palette)
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{
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png_colorp colors = malloc(palette->numColors * sizeof(png_color));
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if (colors == NULL)
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FATAL_ERROR("Failed to allocate PNG palette.\n");
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for (int i = 0; i < palette->numColors; i++) {
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colors[i].red = palette->colors[i].red;
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colors[i].green = palette->colors[i].green;
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colors[i].blue = palette->colors[i].blue;
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}
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png_set_PLTE(png_ptr, info_ptr, colors, palette->numColors);
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free(colors);
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}
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void WritePng(char *path, struct Image *image)
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{
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FILE *fp = fopen(path, "wb");
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if (fp == NULL)
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FATAL_ERROR("Failed to open \"%s\" for writing.\n", path);
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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)
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FATAL_ERROR("Failed to create PNG write struct.\n");
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr)
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FATAL_ERROR("Failed to create PNG info struct.\n");
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if (setjmp(png_jmpbuf(png_ptr)))
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FATAL_ERROR("Failed to init I/O for writing \"%s\".\n", path);
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png_init_io(png_ptr, fp);
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if (setjmp(png_jmpbuf(png_ptr)))
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FATAL_ERROR("Error writing header for \"%s\".\n", path);
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int color_type = image->hasPalette ? PNG_COLOR_TYPE_PALETTE : PNG_COLOR_TYPE_GRAY;
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png_set_IHDR(png_ptr, info_ptr, image->width, image->height,
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image->bitDepth, color_type, PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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if (image->hasPalette) {
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SetPngPalette(png_ptr, info_ptr, &image->palette);
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if (image->hasTransparency) {
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png_byte trans = 0;
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png_set_tRNS(png_ptr, info_ptr, &trans, 1, 0);
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}
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}
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png_write_info(png_ptr, info_ptr);
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png_bytepp row_pointers = malloc(image->height * sizeof(png_bytep));
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if (row_pointers == NULL)
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FATAL_ERROR("Failed to allocate row pointers.\n");
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int rowbytes = png_get_rowbytes(png_ptr, info_ptr);
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for (int i = 0; i < image->height; i++)
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row_pointers[i] = (png_bytep)(image->pixels + (i * rowbytes));
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if (setjmp(png_jmpbuf(png_ptr)))
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FATAL_ERROR("Error writing \"%s\".\n", path);
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png_write_image(png_ptr, row_pointers);
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if (setjmp(png_jmpbuf(png_ptr)))
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FATAL_ERROR("Error ending write of \"%s\".\n", path);
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png_write_end(png_ptr, NULL);
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fclose(fp);
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png_destroy_write_struct(&png_ptr, &info_ptr);
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free(row_pointers);
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}
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