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#include <iostream>
#include <stdexcept>
#include <png.h>
#include "texturepng.h"
TexturePNG::TexturePNG(const char* filename) {
FILE *file = fopen(filename, "rb");
if(!file) {
throw(std::runtime_error("TexturePNG file not found"));
}
png_byte header[8];
fread(header, 1, 8, file);
if(png_sig_cmp(header, 0, 8)) {
throw(std::runtime_error("Invalid PNG file"));
}
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if(!png_ptr) {
throw(std::runtime_error("LibPNG Error (png_ptr)"));
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr) {
throw(std::runtime_error("LibPNG Error (info_ptr)"));
}
png_infop end_info = png_create_info_struct(png_ptr);
if(!end_info) {
throw(std::runtime_error("LibPNG Error (end_info)"));
}
if (setjmp(png_jmpbuf(png_ptr))) {
throw(std::runtime_error("LibPNG Error"));
}
png_init_io(png_ptr, file);
png_set_sig_bytes(png_ptr, 8);
png_read_png(png_ptr, info_ptr, 0, 0);
png_bytep* row_pointers = png_get_rows(png_ptr, info_ptr);
width = png_get_image_width(png_ptr, info_ptr);
height = png_get_image_height(png_ptr, info_ptr);
data = new unsigned char[width * height * 4];
for(int y = 0; y < height; y++) {
for(int x = 0; x < width * 4; x++) {
data[x + y*width*4] = row_pointers[y][x];
}
}
build();
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
}
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