improved TGA handling

1 files changed, 64 insertions, 0 deletions

diff --git a/src/render/image.cc b/src/render/image.cc
new file mode 100644
index 0000000..7ce8113
--- /dev/null
+++ b/src/render/image.cc
@@ -0,0 +1,64 @@
+/*
+   render/image.cc
+   This file is part of the Osirion project and is distributed under 
+   the terms of the GNU General Public License version 2 
+*/
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "render/image.h"
+
+namespace render 
+{
+
+Image::Image(unsigned int width, unsigned int height, unsigned int channels)
+{
+	image_width = width;
+	image_height = height;
+	image_channels = channels;
+
+	image_data = (unsigned char *) malloc(size());
+	clear();
+}
+
+Image::~Image()
+{
+	free(image_data);
+}
+
+void Image::clear()
+{
+	memset(image_data, 0, size());
+}
+
+void Image::swap_channels()
+{
+	for (size_t y =0; y < image_height; y++) {
+		for (size_t x = 0; x < image_width; x++) {
+			size_t offset = y * image_width * image_channels + x * image_channels;
+			unsigned char tmp = image_data[offset];
+			image_data[offset] = image_data[offset + 2];
+			image_data[offset + 2] = tmp;
+		}
+	}
+}
+
+void Image::flip()
+{
+	unsigned char line[image_width*image_channels];
+	for (size_t y=0; y < image_height /2; y++) {
+		memcpy(line,
+			&image_data[y*image_width*image_channels],
+			image_width*image_channels);
+		memcpy(&image_data[y*image_width*image_channels],
+			&image_data[(image_height-1-y)*image_width*image_channels],
+			image_width*image_channels);
+		memcpy(&image_data[(image_height-1-y)*image_width*image_channels],
+			line,
+			image_width*image_channels);
+	}
+}
+
+}
+