Factor out GrAtlasTextBatch fromt GrAtlasTextContext

src/gpu/batches/GrAtlasTextBatch.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrAtlasTextBatch_DEFINED
+#define GrAtlasTextBatch_DEFINED
+
+#include "batches/GrVertexBatch.h"
+
+#include "GrAtlasTextContext.h"
+
+class GrAtlasTextBatch : public GrVertexBatch {
+public:
+    DEFINE_BATCH_CLASS_ID
+    static const size_t kLCDTextVASize = sizeof(SkPoint) + sizeof(SkIPoint16);
+
+    // position + local coord
+    static const size_t kColorTextVASize = sizeof(SkPoint) + sizeof(SkIPoint16);
+    static const size_t kGrayTextVASize = sizeof(SkPoint) + sizeof(GrColor) + sizeof(SkIPoint16);
+    static const int kVerticesPerGlyph = 4;
+    static const int kIndicesPerGlyph = 6;
+
+    typedef GrAtlasTextContext::DistanceAdjustTable DistanceAdjustTable;
+    typedef GrAtlasTextBlob Blob;
+    typedef Blob::Run Run;
+    typedef Run::SubRunInfo TextInfo;
+    struct Geometry {
+        Blob* fBlob;
+        int fRun;
+        int fSubRun;
+        GrColor fColor;
+        SkScalar fTransX;
+        SkScalar fTransY;
+    };
+
+    static GrAtlasTextBatch* CreateBitmap(GrMaskFormat maskFormat, int glyphCount,
+                                          GrBatchFontCache* fontCache) {
+        GrAtlasTextBatch* batch = new GrAtlasTextBatch;
+
+        batch->fFontCache = fontCache;
+        switch (maskFormat) {
+            case kA8_GrMaskFormat:
+                batch->fMaskType = kGrayscaleCoverageMask_MaskType;
+                break;
+            case kA565_GrMaskFormat:
+                batch->fMaskType = kLCDCoverageMask_MaskType;
+                break;
+            case kARGB_GrMaskFormat:
+                batch->fMaskType = kColorBitmapMask_MaskType;
+                break;
+        }
+        batch->fBatch.fNumGlyphs = glyphCount;
+        batch->fGeoCount = 1;
+        batch->fFilteredColor = 0;
+        batch->fFontCache = fontCache;
+        batch->fUseBGR = false;
+        return batch;
+    }
+
+    static GrAtlasTextBatch* CreateDistanceField(int glyphCount, GrBatchFontCache* fontCache,
+                                                 const DistanceAdjustTable* distanceAdjustTable,
+                                                 SkColor filteredColor, bool isLCD,
+                                                 bool useBGR) {
+        GrAtlasTextBatch* batch = new GrAtlasTextBatch;
+
+        batch->fFontCache = fontCache;
+        batch->fMaskType = isLCD ? kLCDDistanceField_MaskType : kGrayscaleDistanceField_MaskType;
+        batch->fDistanceAdjustTable.reset(SkRef(distanceAdjustTable));
+        batch->fFilteredColor = filteredColor;
+        batch->fUseBGR = useBGR;
+        batch->fBatch.fNumGlyphs = glyphCount;
+        batch->fGeoCount = 1;
+        return batch;
+    }
+
+    // to avoid even the initial copy of the struct, we have a getter for the first item which
+    // is used to seed the batch with its initial geometry.  After seeding, the client should call
+    // init() so the Batch can initialize itself
+    Geometry& geometry() { return fGeoData[0]; }
+
+    void init() {
+        const Geometry& geo = fGeoData[0];
+        fBatch.fColor = geo.fColor;
+        fBatch.fViewMatrix = geo.fBlob->fViewMatrix;
+
+        // We don't yet position distance field text on the cpu, so we have to map the vertex bounds
+        // into device space
+        const Run& run = geo.fBlob->fRuns[geo.fRun];
+        if (run.fSubRunInfo[geo.fSubRun].fDrawAsDistanceFields) {
+            SkRect bounds = run.fVertexBounds;
+            fBatch.fViewMatrix.mapRect(&bounds);
+            this->setBounds(bounds);
+        } else {
+            this->setBounds(run.fVertexBounds);
+        }
+    }
+
+    const char* name() const override { return "TextBatch"; }
+
+    SkString dumpInfo() const override;
+
+    void getInvariantOutputColor(GrInitInvariantOutput* out) const override;
+
+    void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override;
+
+    static size_t GetVertexStride(GrMaskFormat maskFormat) {
+        switch (maskFormat) {
+            case kA8_GrMaskFormat:
+                return kGrayTextVASize;
+            case kARGB_GrMaskFormat:
+                return kColorTextVASize;
+            default:
+                return kLCDTextVASize;
+        }
+    }
+
+    static size_t GetVertexStrideDf(GrMaskFormat maskFormat, bool useLCDText) {
+        SkASSERT(maskFormat == kA8_GrMaskFormat);
+        if (useLCDText) {
+            return kLCDTextVASize;
+        } else {
+            return kGrayTextVASize;
+        }
+    }
+
+private:
+    void initBatchTracker(const GrPipelineOptimizations& opt) override;
+
+    struct FlushInfo {
+        SkAutoTUnref<const GrVertexBuffer> fVertexBuffer;
+        SkAutoTUnref<const GrIndexBuffer> fIndexBuffer;
+        int fGlyphsToFlush;
+        int fVertexOffset;
+    };
+
+    void onPrepareDraws(Target* target) override;
+
+    GrAtlasTextBatch() : INHERITED(ClassID()) {} // initialized in factory functions.
+
+    ~GrAtlasTextBatch() {
+        for (int i = 0; i < fGeoCount; i++) {
+            fGeoData[i].fBlob->unref();
+        }
+    }
+
+    GrMaskFormat maskFormat() const {
+        switch (fMaskType) {
+            case kLCDCoverageMask_MaskType:
+                return kA565_GrMaskFormat;
+            case kColorBitmapMask_MaskType:
+                return kARGB_GrMaskFormat;
+            case kGrayscaleCoverageMask_MaskType:
+            case kGrayscaleDistanceField_MaskType:
+            case kLCDDistanceField_MaskType:
+                return kA8_GrMaskFormat;
+        }
+        return kA8_GrMaskFormat; // suppress warning
+    }
+
+    bool usesDistanceFields() const {
+        return kGrayscaleDistanceField_MaskType == fMaskType ||
+               kLCDDistanceField_MaskType == fMaskType;
+    }
+
+    bool isLCD() const {
+        return kLCDCoverageMask_MaskType == fMaskType ||
+               kLCDDistanceField_MaskType == fMaskType;
+    }
+
+    inline void regenerateTextureCoords(GrGlyph* glyph, intptr_t vertex, size_t vertexStride);
+
+    inline void regenerateColors(intptr_t vertex, size_t vertexStride, GrColor color);
+
+    inline void regeneratePositions(intptr_t vertex, size_t vertexStride, SkScalar transX,
+                                    SkScalar transY);
+
+    inline void flush(GrVertexBatch::Target* target, FlushInfo* flushInfo);
+
+    GrColor color() const { return fBatch.fColor; }
+    const SkMatrix& viewMatrix() const { return fBatch.fViewMatrix; }
+    bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; }
+    int numGlyphs() const { return fBatch.fNumGlyphs; }
+
+    bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override;
+
+    // TODO just use class params
+    // TODO trying to figure out why lcd is so whack
+    GrGeometryProcessor* setupDfProcessor(const SkMatrix& viewMatrix, SkColor filteredColor,
+                                          GrColor color, GrTexture* texture);
+
+    struct BatchTracker {
+        GrColor fColor;
+        SkMatrix fViewMatrix;
+        bool fUsesLocalCoords;
+        bool fColorIgnored;
+        bool fCoverageIgnored;
+        int fNumGlyphs;
+    };
+
+    BatchTracker fBatch;
+    // The minimum number of Geometry we will try to allocate.
+    enum { kMinGeometryAllocated = 4 };
+    SkAutoSTMalloc<kMinGeometryAllocated, Geometry> fGeoData;
+    int fGeoCount;
+
+    enum MaskType {
+        kGrayscaleCoverageMask_MaskType,
+        kLCDCoverageMask_MaskType,
+        kColorBitmapMask_MaskType,
+        kGrayscaleDistanceField_MaskType,
+        kLCDDistanceField_MaskType,
+    } fMaskType;
+    bool fUseBGR; // fold this into the enum?
+
+    GrBatchFontCache* fFontCache;
+
+    // Distance field properties
+    SkAutoTUnref<const DistanceAdjustTable> fDistanceAdjustTable;
+    SkColor fFilteredColor;
+
+    typedef GrVertexBatch INHERITED;
+};
+
+#endif