Initial commit.

1 files changed, 45 insertions, 0 deletions

diff --git a/texturepng.cpp b/texturepng.cpp
new file mode 100755
index 0000000..19dd4ab
--- /dev/null
+++ b/texturepng.cpp
@@ -0,0 +1,45 @@
+#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);
+}