Initial CL to move color / coverage off of drawstate

src/gpu/GrBitmapTextContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBitmapTextContext.h"
 #include "GrAtlas.h"
 #include "GrDefaultGeoProcFactory.h"
@@ skipping 517 matching lines @@
     }
 
     if (fCurrVertex > 0) {
         GrDrawState drawState;
         drawState.setFromPaint(fPaint, SkMatrix::I(), fContext->getRenderTarget());
 
         // setup our sampler state for our text texture/atlas
         SkASSERT(SkIsAlign4(fCurrVertex));
         SkASSERT(fCurrTexture);
 
-        // This effect could be stored with one of the cache objects (atlas?)
-        GrTextureParams params(SkShader::kRepeat_TileMode, GrTextureParams::kNone_FilterMode);
-        if (kARGB_GrMaskFormat == fCurrMaskFormat) {
-            uint32_t flags = GrDefaultGeoProcFactory::kLocalCoord_GPType;
-            drawState.setGeometryProcessor(GrDefaultGeoProcFactory::Create(flags))->unref();
-            GrFragmentProcessor* fragProcessor = GrSimpleTextureEffect::Create(fCurrTexture,
-                                                                               SkMatrix::I(),
-                                                                               params);
-            drawState.addColorProcessor(fragProcessor)->unref();
-        } else {
-            uint32_t textureUniqueID = fCurrTexture->getUniqueID();
-            if (textureUniqueID != fEffectTextureUniqueID) {
-                bool hasColor = kA8_GrMaskFormat == fCurrMaskFormat;
-                fCachedGeometryProcessor.reset(GrCustomCoordsTextureEffect::Create(fCurrTexture,
-                                                                                   params,
-                                                                                   hasColor));
-                fEffectTextureUniqueID = textureUniqueID;
-            }
-            drawState.setGeometryProcessor(fCachedGeometryProcessor.get());
-        }
-
         SkASSERT(fStrike);
+        GrColor color;
         switch (fCurrMaskFormat) {
                 // Color bitmap text
-            case kARGB_GrMaskFormat:
-                SkASSERT(!drawState.hasColorVertexAttribute());
-                drawState.setAlpha(fSkPaint.getAlpha());
+            case kARGB_GrMaskFormat: {
+                int a = fSkPaint.getAlpha();
+                color = SkColorSetARGB(a, a, a, a);
                 break;
+            }
                 // LCD text
             case kA565_GrMaskFormat: {
                 // TODO: move supportsRGBCoverage check to setupCoverageEffect and only add LCD
                 // processor if the xp can support it. For now we will simply assume that if
                 // fUseLCDText is true, then we have a known color output.
                 if (!drawState.getXPFactory()->supportsRGBCoverage(0, kRGBA_GrColorComponentFlags)) {
                     SkDebugf("LCD Text will not draw correctly.\n");
                 }
-                SkASSERT(!drawState.hasColorVertexAttribute());
+                // We don't use the GrPaint's color in this case because it's been premultiplied by
+                // alpha. Instead we feed in a non-premultiplied color, and multiply its alpha by
+                // the mask texture color. The end result is that we get
+                //            mask*paintAlpha*paintColor + (1-mask*paintAlpha)*dstColor
+                int a = SkColorGetA(fSkPaint.getColor());
+                // paintAlpha
+                color = SkColorSetARGB(a, a, a, a);
                 break;
             }
                 // Grayscale/BW text
             case kA8_GrMaskFormat:
                 drawState.setHint(GrDrawState::kVertexColorsAreOpaque_Hint,
                                    0xFF == GrColorUnpackA(fPaint.getColor()));
-                // We're using per-vertex color.
-                SkASSERT(drawState.hasColorVertexAttribute());
+                color = fPaint.getColor();
                 break;
             default:
                 SkFAIL("Unexpected mask format.");
         }
+
+        GrTextureParams params(SkShader::kRepeat_TileMode, GrTextureParams::kNone_FilterMode);
+        // TODO cache these GPs
+        if (kARGB_GrMaskFormat == fCurrMaskFormat) {
+            uint32_t textureUniqueID = fCurrTexture->getUniqueID();
+            if (textureUniqueID != fEffectTextureUniqueID ||
+                fCachedGeometryProcessor->getColor() != color) {
+                uint32_t flags = GrDefaultGeoProcFactory::kLocalCoord_GPType;
+                fCachedGeometryProcessor.reset(GrDefaultGeoProcFactory::Create(color, flags));
+                fCachedTextureProcessor.reset(GrSimpleTextureEffect::Create(fCurrTexture,
+                                                                            SkMatrix::I(),
+                                                                            params));
+            }
+            drawState.setGeometryProcessor(fCachedGeometryProcessor.get());
+            drawState.addColorProcessor(fCachedTextureProcessor.get());
+        } else {
+            uint32_t textureUniqueID = fCurrTexture->getUniqueID();
+            if (textureUniqueID != fEffectTextureUniqueID ||
+                fCachedGeometryProcessor->getColor() != color) {
+                bool hasColor = kA8_GrMaskFormat == fCurrMaskFormat;
+                fCachedGeometryProcessor.reset(GrCustomCoordsTextureEffect::Create(color,
+                                                                                   fCurrTexture,
+                                                                                   params,
+                                                                                   hasColor));
+                fEffectTextureUniqueID = textureUniqueID;
+            }
+            drawState.setGeometryProcessor(fCachedGeometryProcessor.get());
+        }
+
         int nGlyphs = fCurrVertex / kVerticesPerGlyph;
         fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
         fDrawTarget->drawIndexedInstances(&drawState,
                                           kTriangles_GrPrimitiveType,
                                           nGlyphs,
                                           kVerticesPerGlyph,
                                           kIndicesPerGlyph,
                                           &fVertexBounds);
 
         fDrawTarget->resetVertexSource();
         fVertices = NULL;
         fAllocVertexCount = 0;
         // reset to be those that are left
         fTotalVertexCount -= fCurrVertex;
         fCurrVertex = 0;
         fVertexBounds.setLargestInverted();
         SkSafeSetNull(fCurrTexture);
     }
 }
 
 inline void GrBitmapTextContext::finish() {
     this->flush();
     fTotalVertexCount = 0;
 
     GrTextContext::finish();
 }