From b36e41cb7117757011e6f1ccc476ccc806219a58 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Mon, 6 Apr 2015 21:48:20 -0300
Subject: Added a PVRTC encoder for iOS

---
 drivers/pvr/texture_loader_pvr.cpp | 51 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

(limited to 'drivers/pvr/texture_loader_pvr.cpp')

diff --git a/drivers/pvr/texture_loader_pvr.cpp b/drivers/pvr/texture_loader_pvr.cpp
index b12e0c28b8..5268b953f4 100644
--- a/drivers/pvr/texture_loader_pvr.cpp
+++ b/drivers/pvr/texture_loader_pvr.cpp
@@ -1,6 +1,8 @@
 #include "texture_loader_pvr.h"
 #include "os/file_access.h"
 #include <string.h>
+#include "PvrTcEncoder.h"
+#include "RgbaBitmap.h"
 
 static void _pvrtc_decompress(Image* p_img);
 
@@ -154,10 +156,59 @@ String ResourceFormatPVR::get_resource_type(const String &p_path) const {
 }
 
 
+
+static void _compress_pvrtc4(Image * p_img) {
+
+	Image img = *p_img;
+
+	bool make_mipmaps=false;
+	if (img.get_width()%8 || img.get_height()%8) {
+		make_mipmaps=img.get_mipmaps()>0;
+		img.resize(img.get_width()+(8-(img.get_width()%8)),img.get_height()+(8-(img.get_height()%8)));
+	}
+	img.convert(Image::FORMAT_RGBA);
+	if (img.get_mipmaps()==0 && make_mipmaps)
+		img.generate_mipmaps();
+
+	bool use_alpha=img.detect_alpha();
+
+	Image new_img;
+	new_img.create(img.get_width(),img.get_height(),true,use_alpha?Image::FORMAT_PVRTC4_ALPHA:Image::FORMAT_PVRTC4);
+	DVector<uint8_t> data=new_img.get_data();
+	{
+		DVector<uint8_t>::Write wr=data.write();
+		DVector<uint8_t>::Read r=img.get_data().read();
+
+
+		for(int i=0;i<=new_img.get_mipmaps();i++) {
+
+			int ofs,size,w,h;
+			img.get_mipmap_offset_size_and_dimensions(i,ofs,size,w,h);
+			Javelin::RgbaBitmap bm(w,h);
+			copymem(bm.GetData(),&r[ofs],size);
+			{
+				Javelin::ColorRgba<unsigned char> *dp = bm.GetData();
+				for(int j=0;j<size/4;j++) {
+					SWAP(dp[j].r,dp[j].b);
+				}
+			}
+
+			new_img.get_mipmap_offset_size_and_dimensions(i,ofs,size,w,h);
+			Javelin::PvrTcEncoder::EncodeRgba4Bpp(&wr[ofs],bm);
+		}
+
+	}
+
+	*p_img = Image(new_img.get_width(),new_img.get_height(),new_img.get_mipmaps(),new_img.get_format(),data);
+
+}
+
 ResourceFormatPVR::ResourceFormatPVR() {
 
 
 	Image::_image_decompress_pvrtc=_pvrtc_decompress;
+	Image::_image_compress_pvrtc4_func=_compress_pvrtc4;
+	Image::_image_compress_pvrtc2_func=_compress_pvrtc4;
 
 }
 
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