1 files changed, 63 insertions, 0 deletions
diff --git a/skia/sgl/SkBlitter_A1.cpp b/skia/sgl/SkBlitter_A1.cpp
new file mode 100644
index 0000000..61d9cf6
--- /dev/null
+++ b/skia/sgl/SkBlitter_A1.cpp
@@ -0,0 +1,63 @@
+/* libs/graphics/sgl/SkBlitter_A1.cpp
+**
+** Copyright 2006, Google Inc.
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#include "SkCoreBlitters.h"
+
+SkA1_Blitter::SkA1_Blitter(const SkBitmap& device, const SkPaint& paint)
+    : INHERITED(device)
+{
+    fSrcA = SkToU8(SkColorGetA(paint.getColor()));
+}
+
+void SkA1_Blitter::blitH(int x, int y, int width)
+{
+    SkASSERT(x >= 0 && y >= 0 && (unsigned)(x + width) <= (unsigned)fDevice.width());
+
+    if (fSrcA <= 0x7F)
+        return;
+
+    uint8_t* dst = fDevice.getAddr1(x, y);
+    int right = x + width;
+
+    int left_mask = 0xFF >> (x & 7);
+    int rite_mask = 0xFF << (8 - (right & 7));
+    int full_runs = (right >> 3) - ((x + 7) >> 3);
+
+    // check for empty right mask, so we don't read off the end (or go slower than we need to)
+    if (rite_mask == 0)
+    {
+        SkASSERT(full_runs >= 0);
+        full_runs -= 1;
+        rite_mask = 0xFF;
+    }
+    if (left_mask == 0xFF)
+        full_runs -= 1;
+
+    if (full_runs < 0)
+    {
+        SkASSERT((left_mask & rite_mask) != 0);
+        *dst |= (left_mask & rite_mask);
+    }
+    else
+    {
+        *dst++ |= left_mask;
+        memset(dst, 0xFF, full_runs);
+        dst += full_runs;
+        *dst |= rite_mask;
+    }
+}
+