Bmp Image Decoding

src/codec/SkCodec_libpng.cpp

Index: src/codec/SkCodec_libpng.cpp
diff --git a/src/codec/SkCodec_libpng.cpp b/src/codec/SkCodec_libpng.cpp
index 8e7ee33a9554bce341cf8681b2db86d334bfae1b..5127267bdb86e5d595de3ecebecfd894a6c9866e 100644
--- a/src/codec/SkCodec_libpng.cpp
+++ b/src/codec/SkCodec_libpng.cpp
@@ -346,10 +346,6 @@ SkPngCodec::~SkPngCodec() {
 // Getting the pixels
 ///////////////////////////////////////////////////////////////////////////////
 
-static bool premul_and_unpremul(SkAlphaType A, SkAlphaType B) {
-    return kPremul_SkAlphaType == A && kUnpremul_SkAlphaType == B;
-}
-
 static bool conversion_possible(const SkImageInfo& A, const SkImageInfo& B) {
     // TODO: Support other conversions
     if (A.colorType() != B.colorType()) {
@@ -448,7 +444,7 @@ SkCodec::Result SkPngCodec::onGetPixels(const SkImageInfo& requestedInfo, void*
     if (numberPasses > 1) {
         const int width = requestedInfo.width();
         const int height = requestedInfo.height();
-        const int bpp = SkSwizzler::BytesPerPixel(sc);
+        const int bpp = SkSwizzler::DeltaSrc(sc);
         const size_t rowBytes = width * bpp;
 
         storage.reset(width * height * bpp);
@@ -466,15 +462,15 @@ SkCodec::Result SkPngCodec::onGetPixels(const SkImageInfo& requestedInfo, void*
         // Now swizzle it.
         uint8_t* row = base;
         for (int y = 0; y < height; y++) {
-            reallyHasAlpha |= swizzler->next(row);
+            reallyHasAlpha |= !SkSwizzler::IsOpaque(swizzler->next(row));
             row += rowBytes;
         }
     } else {
-        storage.reset(requestedInfo.width() * SkSwizzler::BytesPerPixel(sc));
+        storage.reset(requestedInfo.width() * SkSwizzler::DeltaSrc(sc));
         uint8_t* srcRow = static_cast<uint8_t*>(storage.get());
         for (int y = 0; y < requestedInfo.height(); y++) {
             png_read_rows(fPng_ptr, &srcRow, png_bytepp_NULL, 1);
-            reallyHasAlpha |= swizzler->next(srcRow);
+            reallyHasAlpha |= !SkSwizzler::IsOpaque(swizzler->next(srcRow));
         }
     }