1 files changed, 84 insertions, 3 deletions

diff --git a/core/image.cpp b/core/image.cpp
index 04b3905489..037018519e 100644
--- a/core/image.cpp
+++ b/core/image.cpp
@@ -1124,6 +1124,7 @@ void Image::create( const char ** p_xpm ) {
 }
 #define DETECT_ALPHA_MAX_TRESHOLD 254
 #define DETECT_ALPHA_MIN_TRESHOLD 2
+
 #define DETECT_ALPHA( m_value )\
 { \
 	uint8_t value=m_value;\
@@ -1136,6 +1137,82 @@ void Image::create( const char ** p_xpm ) {
 	}\
 }
 
+#define DETECT_NON_ALPHA( m_value )\
+{ \
+	uint8_t value=m_value;\
+	if (value>0) {\
+		\
+		detected=true;\
+		break;\
+	}\
+}
+
+
+bool Image::is_invisible() const {
+
+	if (format==FORMAT_GRAYSCALE ||
+	    format==FORMAT_RGB ||
+	    format==FORMAT_INDEXED)
+		return false;
+
+	int len = data.size();
+
+	if (len==0)
+		return true;
+
+	if (format >= FORMAT_YUV_422 && format <= FORMAT_YUV_444)
+		return false;
+
+	int w,h;
+	_get_mipmap_offset_and_size(1,len,w,h);
+
+	DVector<uint8_t>::Read r = data.read();
+	const unsigned char *data_ptr=r.ptr();
+
+	bool detected=false;
+
+	switch(format) {
+		case FORMAT_INTENSITY: {
+
+			for(int i=0;i<len;i++) {
+				DETECT_NON_ALPHA(data_ptr[i]);
+			}
+		} break;
+		case FORMAT_GRAYSCALE_ALPHA: {
+
+
+			for(int i=0;i<(len>>1);i++) {
+				DETECT_NON_ALPHA(data_ptr[(i<<1)+1]);
+			}
+
+		} break;
+		case FORMAT_RGBA: {
+
+			for(int i=0;i<(len>>2);i++) {
+				DETECT_NON_ALPHA(data_ptr[(i<<2)+3])
+			}
+
+		} break;
+		case FORMAT_INDEXED: {
+
+			return false;
+		} break;
+		case FORMAT_INDEXED_ALPHA: {
+
+			return false;
+		} break;
+		case FORMAT_PVRTC2_ALPHA:
+		case FORMAT_PVRTC4_ALPHA:
+		case FORMAT_BC2:
+		case FORMAT_BC3: {
+			detected=true;
+		} break;
+		default: {}
+	}
+
+	return !detected;
+}
+
 Image::AlphaMode Image::detect_alpha() const {
 
 	if (format==FORMAT_GRAYSCALE ||
@@ -1746,6 +1823,10 @@ Error Image::_decompress_bc() {
 	return OK;
 }
 
+bool Image::is_compressed() const {
+	return format>=FORMAT_BC1;
+}
+
 
 Image Image::decompressed() const {
 
@@ -1998,7 +2079,7 @@ void Image::blit_rect(const Image& p_src, const Rect2& p_src_rect,const Point2&
 }
 
 
-Image (*Image::_png_mem_loader_func)(const uint8_t*)=NULL;
+Image (*Image::_png_mem_loader_func)(const uint8_t*,int)=NULL;
 void (*Image::_image_compress_bc_func)(Image *)=NULL;
 void (*Image::_image_compress_pvrtc2_func)(Image *)=NULL;
 void (*Image::_image_compress_pvrtc4_func)(Image *)=NULL;
@@ -2167,7 +2248,7 @@ void Image::fix_alpha_edges() {
 
 }
 
-Image::Image(const uint8_t* p_png) {
+Image::Image(const uint8_t* p_png,int p_len) {
 
 	width=0;
 	height=0;
@@ -2175,7 +2256,7 @@ Image::Image(const uint8_t* p_png) {
 	format=FORMAT_GRAYSCALE;
 
 	if (_png_mem_loader_func) {
-		*this = _png_mem_loader_func(p_png);
+		*this = _png_mem_loader_func(p_png,p_len);
 	}
 }