implement drawAtlas natively on gpu-device

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "GrBlurUtils.h"
@@ skipping 1621 matching lines @@
                                vertexCount,
                                vertices,
                                texs,
                                colors,
                                outIndices,
                                indexCount);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
+static void append_quad_indices(uint16_t indices[], int quadIndex) {
+    int i = quadIndex * 4;
+    indices[0] = i + 0; indices[1] = i + 1; indices[2] = i + 2;
+    indices[3] = i + 2; indices[4] = i + 3; indices[5] = i + 0;
+}
+
+void SkGpuDevice::drawAtlas(const SkDraw& d, const SkImage* atlas, const SkRSXform xform[],
+                            const SkRect texRect[], const SkColor colors[], int count,
+                            SkXfermode::Mode mode, const SkPaint& paint) {
+    if (paint.isAntiAlias()) {
+        this->INHERITED::drawAtlas(d, atlas, xform, texRect, colors, count, mode, paint);
+        return;
+    }
+
+    SkPaint p(paint);
+    p.setShader(atlas->newShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode))->unref();
+
+    const int vertCount = count * 4;
+    const int indexCount = count * 6;
+    SkAutoTMalloc<SkPoint> vertStorage(vertCount * 2);
+    SkPoint* verts = vertStorage.get();
+    SkPoint* texs = verts + vertCount;
+    SkAutoTMalloc<uint16_t> indexStorage(indexCount);
+    uint16_t* indices = indexStorage.get();
+    SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(mode));
+
+    for (int i = 0; i < count; ++i) {
+        xform[i].toQuad(texRect[i].width(), texRect[i].height(), verts);
+        texRect[i].toQuad(texs);
+        append_quad_indices(indices, i);
+        verts += 4;
+        texs += 4;
+        indices += 6;
+    }
+
+    verts = vertStorage.get();
+    texs = verts + vertCount;
+    indices = indexStorage.get();
+    this->drawVertices(d, SkCanvas::kTriangles_VertexMode, vertCount, verts, texs, colors, xfer,
+                       indices, indexCount, p);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 void SkGpuDevice::drawText(const SkDraw& draw, const void* text,
                            size_t byteLength, SkScalar x, SkScalar y,
                            const SkPaint& paint) {
     CHECK_SHOULD_DRAW(draw);
     GR_CREATE_TRACE_MARKER_CONTEXT("SkGpuDevice::drawText", fContext);
 
     GrPaint grPaint;
     if (!SkPaint2GrPaint(this->context(), fRenderTarget, paint, *draw.fMatrix, true, &grPaint)) {
         return;
     }
@@ skipping 151 matching lines @@
 #endif
 }
 
 SkImageFilter::Cache* SkGpuDevice::getImageFilterCache() {
     // We always return a transient cache, so it is freed after each
     // filter traversal.
     return SkImageFilter::Cache::Create(kDefaultImageFilterCacheSize);
 }
 
 #endif