add kGray_8_SkColorType

src/core/SkConfig8888.cpp

Index: src/core/SkConfig8888.cpp
diff --git a/src/core/SkConfig8888.cpp b/src/core/SkConfig8888.cpp
index 85e208f2875b987edc253a925f75b7d46ea5f81d..d28941c27cf79120d3cd2a041ca577988c7bd82c 100644
--- a/src/core/SkConfig8888.cpp
+++ b/src/core/SkConfig8888.cpp
@@ -137,6 +137,47 @@ static void rect_memcpy(void* dst, size_t dstRB, const void* src, size_t srcRB,
     }
 }
 
+static void copy_g8_to_32(void* dst, size_t dstRB, const void* src, size_t srcRB, int w, int h) {
+    uint32_t* dst32 = (uint32_t*)dst;
+    const uint8_t* src8 = (const uint8_t*)src;
+    
+    for (int y = 0; y < h; ++y) {
+        for (int x = 0; x < w; ++x) {
+            dst32[x] = SkPackARGB32(0xFF, src8[x], src8[x], src8[x]);
+        }
+        dst32 = (uint32_t*)((char*)dst32 + dstRB);
+        src8 += srcRB;
+    }
+}
+
+static void copy_32_to_g8(void* dst, size_t dstRB, const void* src, size_t srcRB,
+                          const SkImageInfo& srcInfo) {
+    uint8_t* dst8 = (uint8_t*)dst;
+    const uint32_t* src32 = (const uint32_t*)src;
+
+    const int w = srcInfo.width();
+    const int h = srcInfo.height();
+    const bool isBGRA = (kBGRA_8888_SkColorType == srcInfo.colorType());
+
+    for (int y = 0; y < h; ++y) {
+        if (isBGRA) {
+            // BGRA
+            for (int x = 0; x < w; ++x) {
+                uint32_t s = src32[x];
+                dst8[x] = SkComputeLuminance((s >> 16) & 0xFF, (s >> 8) & 0xFF, s & 0xFF);
+            }
+        } else {
+            // RGBA
+            for (int x = 0; x < w; ++x) {
+                uint32_t s = src32[x];
+                dst8[x] = SkComputeLuminance(s & 0xFF, (s >> 8) & 0xFF, (s >> 16) & 0xFF);
+            }
+        }
+        src32 = (const uint32_t*)((const char*)src32 + srcRB);
+        dst8 += dstRB;
+    }
+}
+
 bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
                              const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
                              SkColorTable* ctable) {
@@ -170,6 +211,7 @@ bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t
         switch (srcInfo.colorType()) {
             case kRGB_565_SkColorType:
             case kAlpha_8_SkColorType:
+            case kGray_8_SkColorType:
                 break;
             case kIndex_8_SkColorType:
             case kARGB_4444_SkColorType:
@@ -189,6 +231,15 @@ bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t
      *  are supported.
      */
 
+    if (kGray_8_SkColorType == srcInfo.colorType() && 4 == dstInfo.bytesPerPixel()) {
+        copy_g8_to_32(dstPixels, dstRB, srcPixels, srcRB, width, height);
+        return true;
+    }
+    if (kGray_8_SkColorType == dstInfo.colorType() && 4 == srcInfo.bytesPerPixel()) {
+        copy_32_to_g8(dstPixels, dstRB, srcPixels, srcRB, srcInfo);
+        return true;
+    }
+
     // Can no longer draw directly into 4444, but we can manually whack it for a few combinations
     if (kARGB_4444_SkColorType == dstInfo.colorType() &&
         (kN32_SkColorType == srcInfo.colorType() || kIndex_8_SkColorType == srcInfo.colorType())) {