+namespace NPatchBuffer
+{
+
+void GetRedOffsetAndMask( Dali::Pixel::Format pixelFormat, int& byteOffset, int& bitMask )
+{
+ switch( pixelFormat )
+ {
+ case Dali::Pixel::A8:
+ case Dali::Pixel::L8:
+ case Dali::Pixel::LA88:
+ {
+ byteOffset = 0;
+ bitMask = 0;
+ break;
+ }
+ case Dali::Pixel::RGB888:
+ case Dali::Pixel::RGB8888:
+ case Dali::Pixel::RGBA8888:
+ {
+ byteOffset = 0;
+ bitMask = 0xFF;
+ break;
+ }
+ case Dali::Pixel::BGR8888:
+ case Dali::Pixel::BGRA8888:
+ {
+ byteOffset = 2;
+ bitMask = 0xff;
+ break;
+ }
+ case Dali::Pixel::RGB565:
+ {
+ byteOffset = 0;
+ bitMask = 0xf8;
+ break;
+ }
+ case Dali::Pixel::BGR565:
+ {
+ byteOffset = 1;
+ bitMask = 0x1f;
+ break;
+ }
+ case Dali::Pixel::RGBA4444:
+ {
+ byteOffset = 0;
+ bitMask = 0xf0;
+ break;
+ }
+ case Dali::Pixel::BGRA4444:
+ {
+ byteOffset = 1;
+ bitMask = 0xf0;
+ break;
+ }
+ case Dali::Pixel::RGBA5551:
+ {
+ byteOffset = 0;
+ bitMask = 0xf8;
+ break;
+ }
+ case Dali::Pixel::BGRA5551:
+ {
+ byteOffset = 1;
+ bitMask = 0x1e;
+ break;
+ }
+ case Dali::Pixel::INVALID:
+ case Dali::Pixel::COMPRESSED_R11_EAC:
+ case Dali::Pixel::COMPRESSED_SIGNED_R11_EAC:
+ case Dali::Pixel::COMPRESSED_RG11_EAC:
+ case Dali::Pixel::COMPRESSED_SIGNED_RG11_EAC:
+ case Dali::Pixel::COMPRESSED_RGB8_ETC2:
+ case Dali::Pixel::COMPRESSED_SRGB8_ETC2:
+ case Dali::Pixel::COMPRESSED_RGB8_ETC1:
+ case Dali::Pixel::COMPRESSED_RGB_PVRTC_4BPPV1:
+ case Dali::Pixel::COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
+ case Dali::Pixel::COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
+ case Dali::Pixel::COMPRESSED_RGBA8_ETC2_EAC:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_4x4_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_5x4_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_5x5_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_6x5_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_6x6_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_8x5_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_8x6_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_8x8_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_10x5_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_10x6_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_10x8_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_10x10_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_12x10_KHR:
+ case Dali::Pixel::COMPRESSED_RGBA_ASTC_12x12_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR:
+ case Dali::Pixel::COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR:
+ {
+ DALI_LOG_ERROR("Pixel formats for compressed images are not compatible with simple masking-out of per-pixel alpha.\n");
+ byteOffset=0;
+ bitMask=0;
+ break;
+ }
+ case Dali::Pixel::RGB16F:
+ case Dali::Pixel::RGB32F:
+ {
+ DALI_LOG_ERROR("Pixel format not compatible.\n");
+ byteOffset=0;
+ bitMask=0;
+ break;
+ }
+ }
+}
+
+Uint16Pair ParseRange( unsigned int& index, unsigned int width, unsigned char* pixel, unsigned int pixelStride, int testByte, int testBits, int testValue )
+{
+ unsigned int start = 0xFFFF;
+ for( ; index < width; ++index, pixel += pixelStride )
+ {
+ if( ( pixel[ testByte ] & testBits ) == testValue )
+ {
+ start = index;
+ ++index;
+ pixel += pixelStride;
+ break;
+ }
+ }
+
+ unsigned int end = width;
+ for( ; index < width; ++index, pixel += pixelStride )
+ {
+ if( ( pixel[ testByte ] & testBits ) != testValue )
+ {
+ end = index;
+ ++index;
+ pixel += pixelStride;
+ break;
+ }
+ }
+
+ return Uint16Pair( start, end );
+}
+
+void ParseBorders( Devel::PixelBuffer& pixelBuffer, NPatchLoader::Data* data )
+{
+ data->stretchPixelsX.Clear();
+ data->stretchPixelsY.Clear();
+
+ Pixel::Format pixelFormat = pixelBuffer.GetPixelFormat();
+
+ int alphaByte = 0;
+ int alphaBits = 0;
+ Pixel::GetAlphaOffsetAndMask( pixelFormat, alphaByte, alphaBits );
+
+ int testByte = alphaByte;
+ int testBits = alphaBits;
+ int testValue = alphaBits; // Opaque == stretch
+ if( !alphaBits )
+ {
+ GetRedOffsetAndMask( pixelFormat, testByte, testBits );
+ testValue = 0; // Black == stretch
+ }
+
+ unsigned int bytesPerPixel = Pixel::GetBytesPerPixel( pixelFormat );
+ unsigned int width = pixelBuffer.GetWidth();
+ unsigned int height = pixelBuffer.GetHeight();
+ unsigned char* srcPixels = pixelBuffer.GetBuffer();
+ unsigned int srcStride = width * bytesPerPixel;
+
+ // TOP
+ unsigned char* top = srcPixels + bytesPerPixel;
+ unsigned int index = 0;
+
+ for( ; index < width - 2; )
+ {
+ Uint16Pair range = ParseRange( index, width - 2, top, bytesPerPixel, testByte, testBits, testValue );
+ if( range.GetX() != 0xFFFF )
+ {
+ data->stretchPixelsX.PushBack( range );
+ }
+ }
+
+ // LEFT
+ unsigned char* left = srcPixels + srcStride;
+ index = 0;
+ for( ; index < height - 2; )
+ {
+ Uint16Pair range = ParseRange( index, height - 2, left, srcStride, testByte, testBits, testValue );
+ if( range.GetX() != 0xFFFF )
+ {
+ data->stretchPixelsY.PushBack( range );
+ }
+ }
+
+ // If there are no stretch pixels then make the entire image stretchable
+ if( data->stretchPixelsX.Size() == 0 )
+ {
+ data->stretchPixelsX.PushBack( Uint16Pair( 0, width - 2 ) );
+ }
+ if( data->stretchPixelsY.Size() == 0 )
+ {
+ data->stretchPixelsY.PushBack( Uint16Pair( 0, height - 2 ) );
+ }
+}
+
+} // namespace NPatchBuffer
+