Commit 897526fd authored by pavlov%pavlov.net's avatar pavlov%pavlov.net
Browse files

speed up 8bit alpha png decoding by not doing extra division for opaque pixels. bug 331298

parent c0c2ef84

modules/libpr0n/decoders/png/nsPNGDecoder.cpp

+14 −0
Original line number Diff line number Diff line
@@ -545,6 +545,20 @@ row_callback(png_structp png_ptr, png_bytep new_row, 
            *cptr++ = 0;

            *cptr++ = 0;

            *cptr++ = 0;

          } else if (a == 0xFF) {

#ifdef IS_LITTLE_ENDIAN

            // BGRA

            *cptr++ = b;

            *cptr++ = g;

            *cptr++ = r;

            *cptr++ = a;

#else

            // ARGB

            *cptr++ = a;

            *cptr++ = r;

            *cptr++ = b;

            *cptr++ = g;

#endif

          } else {

#ifdef IS_LITTLE_ENDIAN

            // BGRA