Remove alpha readback path in GrGLGpu::onReadPixels

Change-Id: I13d5a885a5a016ca7555702c5798c5b3f31b1cc8
Reviewed-on: https://skia-review.googlesource.com/131820
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>

1 files changed, 0 insertions, 17 deletions

diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index e89439a07a..b0b55e51f8 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -2034,24 +2034,7 @@ bool GrGLGpu::onReadPixels(GrSurface* surface, int left, int top, int width, int
     // TODO: Avoid this conversion by making GrGLCaps work with color types.
     auto dstAsConfig = GrColorTypeToPixelConfig(dstColorType, GrSRGBEncoded::kNo);
 
-    // We have a special case fallback for reading eight bit alpha. We will read back all four 8
-    // bit channels as RGBA and then extract A.
     if (!this->readPixelsSupported(surface, dstAsConfig)) {
-        if (kAlpha_8_GrPixelConfig == dstAsConfig &&
-            this->readPixelsSupported(surface, kRGBA_8888_GrPixelConfig)) {
-            std::unique_ptr<uint32_t[]> temp(new uint32_t[width * height * 4]);
-            if (this->onReadPixels(surface, left, top, width, height, GrColorType::kRGBA_8888,
-                                   temp.get(), width * 4)) {
-                uint8_t* dst = reinterpret_cast<uint8_t*>(buffer);
-                for (int j = 0; j < height; ++j) {
-                    for (int i = 0; i < width; ++i) {
-                        dst[j*rowBytes + i] = (0xFF000000U & temp[j*width+i]) >> 24;
-                    }
-                }
-                return true;
-            }
-        }
-
         // If reading in half float format is not supported, then read in a temporary float buffer
         // and convert to half float.
         if (kRGBA_half_GrPixelConfig == dstAsConfig &&