Move soil to external, this breaks windows build until deathroi will commit the windows part

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3175 8ced0084-cf51-0410-be5f-012b33b47a6e

Externals/SOIL/image_helper.h

@@ -0,0 +1,115 @@
+/*
+    Jonathan Dummer
+
+    Image helper functions
+
+    MIT license
+*/
+
+#ifndef HEADER_IMAGE_HELPER
+#define HEADER_IMAGE_HELPER
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+	This function upscales an image.
+	Not to be used to create MIPmaps,
+	but to make it square,
+	or to make it a power-of-two sized.
+**/
+int
+	up_scale_image
+	(
+		const unsigned char* const orig,
+		int width, int height, int channels,
+		unsigned char* resampled,
+		int resampled_width, int resampled_height
+	);
+
+/**
+	This function downscales an image.
+	Used for creating MIPmaps,
+	the incoming image should be a
+	power-of-two sized.
+**/
+int
+	mipmap_image
+	(
+		const unsigned char* const orig,
+		int width, int height, int channels,
+		unsigned char* resampled,
+		int block_size_x, int block_size_y
+	);
+
+/**
+	This function takes the RGB components of the image
+	and scales each channel from [0,255] to [16,235].
+	This makes the colors "Safe" for display on NTSC
+	displays.  Note that this is _NOT_ a good idea for
+	loading images like normal- or height-maps!
+**/
+int
+	scale_image_RGB_to_NTSC_safe
+	(
+		unsigned char* orig,
+		int width, int height, int channels
+	);
+
+/**
+	This function takes the RGB components of the image
+	and converts them into YCoCg.  3 components will be
+	re-ordered to CoYCg (for optimum DXT1 compression),
+	while 4 components will be ordered CoCgAY (for DXT5
+	compression).
+**/
+int
+	convert_RGB_to_YCoCg
+	(
+		unsigned char* orig,
+		int width, int height, int channels
+	);
+
+/**
+	This function takes the YCoCg components of the image
+	and converts them into RGB.  See above.
+**/
+int
+	convert_YCoCg_to_RGB
+	(
+		unsigned char* orig,
+		int width, int height, int channels
+	);
+
+/**
+	Converts an HDR image from an array
+	of unsigned chars (RGBE) to RGBdivA
+	\return 0 if failed, otherwise returns 1
+**/
+int
+	RGBE_to_RGBdivA
+	(
+		unsigned char *image,
+		int width, int height,
+		int rescale_to_max
+	);
+
+/**
+	Converts an HDR image from an array
+	of unsigned chars (RGBE) to RGBdivA2
+	\return 0 if failed, otherwise returns 1
+**/
+int
+	RGBE_to_RGBdivA2
+	(
+		unsigned char *image,
+		int width, int height,
+		int rescale_to_max
+	);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HEADER_IMAGE_HELPER	*/