Remove last bit of privacy violation for GrAtlasTextBlob

src/gpu/text/GrAtlasTextBlob_regenInBatch.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrAtlasTextBlob.h"
+
+#include "GrBatchFlushState.h"
+
+#include "SkDistanceFieldGen.h"
+#include "SkGlyphCache.h"
+
+#include "batches/GrAtlasTextBatch.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// A large template to handle regenerating the vertices of a textblob with as few branches as
+// possible
+template <bool regenPos, bool regenCol, bool regenTexCoords>
+inline void regen_vertices(intptr_t vertex, const GrGlyph* glyph, size_t vertexStride,
+                           bool useDistanceFields, SkScalar transX, SkScalar transY,
+                           GrColor color) {
+    int u0, v0, u1, v1;
+    if (regenTexCoords) {
+        SkASSERT(glyph);
+        int width = glyph->fBounds.width();
+        int height = glyph->fBounds.height();
+
+        if (useDistanceFields) {
+            u0 = glyph->fAtlasLocation.fX + SK_DistanceFieldInset;
+            v0 = glyph->fAtlasLocation.fY + SK_DistanceFieldInset;
+            u1 = u0 + width - 2 * SK_DistanceFieldInset;
+            v1 = v0 + height - 2 * SK_DistanceFieldInset;
+        } else {
+            u0 = glyph->fAtlasLocation.fX;
+            v0 = glyph->fAtlasLocation.fY;
+            u1 = u0 + width;
+            v1 = v0 + height;
+        }
+    }
+
+    // This is a bit wonky, but sometimes we have LCD text, in which case we won't have color
+    // vertices, hence vertexStride - sizeof(SkIPoint16)
+    intptr_t colorOffset = sizeof(SkPoint);
+    intptr_t texCoordOffset = vertexStride - sizeof(SkIPoint16);
+
+    // V0
+    if (regenPos) {
+        SkPoint* point = reinterpret_cast<SkPoint*>(vertex);
+        point->fX += transX;
+        point->fY += transY;
+    }
+
+    if (regenCol) {
+        SkColor* vcolor = reinterpret_cast<SkColor*>(vertex + colorOffset);
+        *vcolor = color;
+    }
+
+    if (regenTexCoords) {
+        SkIPoint16* textureCoords = reinterpret_cast<SkIPoint16*>(vertex + texCoordOffset);
+        textureCoords->set(u0, v0);
+    }
+    vertex += vertexStride;
+
+    // V1
+    if (regenPos) {
+        SkPoint* point = reinterpret_cast<SkPoint*>(vertex);
+        point->fX += transX;
+        point->fY += transY;
+    }
+
+    if (regenCol) {
+        SkColor* vcolor = reinterpret_cast<SkColor*>(vertex + colorOffset);
+        *vcolor = color;
+    }
+
+    if (regenTexCoords) {
+        SkIPoint16* textureCoords = reinterpret_cast<SkIPoint16*>(vertex + texCoordOffset);
+        textureCoords->set(u0, v1);
+    }
+    vertex += vertexStride;
+
+    // V2
+    if (regenPos) {
+        SkPoint* point = reinterpret_cast<SkPoint*>(vertex);
+        point->fX += transX;
+        point->fY += transY;
+    }
+
+    if (regenCol) {
+        SkColor* vcolor = reinterpret_cast<SkColor*>(vertex + colorOffset);
+        *vcolor = color;
+    }
+
+    if (regenTexCoords) {
+        SkIPoint16* textureCoords = reinterpret_cast<SkIPoint16*>(vertex + texCoordOffset);
+        textureCoords->set(u1, v1);
+    }
+    vertex += vertexStride;
+
+    // V3
+    if (regenPos) {
+        SkPoint* point = reinterpret_cast<SkPoint*>(vertex);
+        point->fX += transX;
+        point->fY += transY;
+    }
+
+    if (regenCol) {
+        SkColor* vcolor = reinterpret_cast<SkColor*>(vertex + colorOffset);
+        *vcolor = color;
+    }
+
+    if (regenTexCoords) {
+        SkIPoint16* textureCoords = reinterpret_cast<SkIPoint16*>(vertex + texCoordOffset);
+        textureCoords->set(u1, v0);
+    }
+}
+
+template <bool regenPos, bool regenCol, bool regenTexCoords, bool regenGlyphs>
+void GrAtlasTextBlob::regenInBatch(GrDrawBatch::Target* target,
+                                   GrBatchFontCache* fontCache,
+                                   GrBlobRegenHelper *helper,
+                                   Run* run,
+                                   Run::SubRunInfo* info, SkGlyphCache** cache,
+                                   SkTypeface** typeface, GrFontScaler** scaler,
+                                   const SkDescriptor** desc,
+                                   int glyphCount, size_t vertexStride,
+                                   GrColor color, SkScalar transX,
+                                   SkScalar transY) const {
+    static_assert(!regenGlyphs || regenTexCoords, "must regenTexCoords along regenGlyphs");
+    GrBatchTextStrike* strike = nullptr;
+    if (regenTexCoords) {
+        info->resetBulkUseToken();
+
+        // We can reuse if we have a valid strike and our descriptors / typeface are the
+        // same.  The override descriptor is only for the non distance field text within
+        // a run
+        const SkDescriptor* newDesc = (run->fOverrideDescriptor && !info->drawAsDistanceFields()) ?
+                                      run->fOverrideDescriptor->getDesc() :
+                                      run->fDescriptor.getDesc();
+        if (!*cache || !SkTypeface::Equal(*typeface, run->fTypeface) ||
+            !((*desc)->equals(*newDesc))) {
+            if (*cache) {
+                SkGlyphCache::AttachCache(*cache);
+            }
+            *desc = newDesc;
+            *cache = SkGlyphCache::DetachCache(run->fTypeface, *desc);
+            *scaler = GrTextContext::GetGrFontScaler(*cache);
+            *typeface = run->fTypeface;
+        }
+
+        if (regenGlyphs) {
+            strike = fontCache->getStrike(*scaler);
+        } else {
+            strike = info->strike();
+        }
+    }
+
+    bool brokenRun = false;
+    for (int glyphIdx = 0; glyphIdx < glyphCount; glyphIdx++) {
+        GrGlyph* glyph = nullptr;
+        if (regenTexCoords) {
+            size_t glyphOffset = glyphIdx + info->glyphStartIndex();
+
+            if (regenGlyphs) {
+                // Get the id from the old glyph, and use the new strike to lookup
+                // the glyph.
+                GrGlyph::PackedID id = fGlyphs[glyphOffset]->fPackedID;
+                fGlyphs[glyphOffset] = strike->getGlyph(id, info->maskFormat(), *scaler);
+                SkASSERT(id == fGlyphs[glyphOffset]->fPackedID);
+            }
+            glyph = fGlyphs[glyphOffset];
+            SkASSERT(glyph && glyph->fMaskFormat == info->maskFormat());
+
+            if (!fontCache->hasGlyph(glyph) &&
+                !strike->addGlyphToAtlas(target, glyph, *scaler, info->maskFormat())) {
+                helper->flush();
+                brokenRun = glyphIdx > 0;
+
+                SkDEBUGCODE(bool success =) strike->addGlyphToAtlas(target,
+                                                                    glyph,
+                                                                    *scaler,
+                                                                    info->maskFormat());
+                SkASSERT(success);
+            }
+            fontCache->addGlyphToBulkAndSetUseToken(info->bulkUseToken(), glyph,
+                                                    target->currentToken());
+        }
+
+        intptr_t vertex = reinterpret_cast<intptr_t>(fVertices);
+        vertex += info->vertexStartIndex();
+        vertex += vertexStride * glyphIdx * GrAtlasTextBatch::kVerticesPerGlyph;
+        regen_vertices<regenPos, regenCol, regenTexCoords>(vertex, glyph, vertexStride,
+                                                           info->drawAsDistanceFields(), transX,
+                                                           transY, color);
+        helper->incGlyphCount();
+    }
+
+    // We may have changed the color so update it here
+    info->setColor(color);
+    if (regenTexCoords) {
+        if (regenGlyphs) {
+            info->setStrike(strike);
+        }
+        info->setAtlasGeneration(brokenRun ? GrBatchAtlas::kInvalidAtlasGeneration :
+                                 fontCache->atlasGeneration(info->maskFormat()));
+    }
+}
+
+enum RegenMask {
+    kNoRegen    = 0x0,
+    kRegenPos   = 0x1,
+    kRegenCol   = 0x2,
+    kRegenTex   = 0x4,
+    kRegenGlyph = 0x8 | kRegenTex, // we have to regenerate the texture coords when we regen glyphs
+
+    // combinations
+        kRegenPosCol = kRegenPos | kRegenCol,
+    kRegenPosTex = kRegenPos | kRegenTex,
+    kRegenPosTexGlyph = kRegenPos | kRegenGlyph,
+    kRegenPosColTex = kRegenPos | kRegenCol | kRegenTex,
+    kRegenPosColTexGlyph = kRegenPos | kRegenCol | kRegenGlyph,
+    kRegenColTex = kRegenCol | kRegenTex,
+    kRegenColTexGlyph = kRegenCol | kRegenGlyph,
+};
+
+#define REGEN_ARGS target, fontCache, helper, &run, &info, cache, typeface, scaler, desc, \
+                   *glyphCount, vertexStride, color, transX, transY
+
+void GrAtlasTextBlob::regenInBatch(GrDrawBatch::Target* target,
+                                   GrBatchFontCache* fontCache,
+                                   GrBlobRegenHelper *helper,
+                                   int runIndex, int subRunIndex, SkGlyphCache** cache,
+                                   SkTypeface** typeface, GrFontScaler** scaler,
+                                   const SkDescriptor** desc, size_t vertexStride,
+                                   GrColor color, SkScalar transX,
+                                   SkScalar transY,
+                                   void** vertices, size_t* byteCount, int* glyphCount) {
+    Run& run = fRuns[runIndex];
+    Run::SubRunInfo& info = run.fSubRunInfo[subRunIndex];
+
+    uint64_t currentAtlasGen = fontCache->atlasGeneration(info.maskFormat());
+
+    // Because the GrBatchFontCache may evict the strike a blob depends on using for
+    // generating its texture coords, we have to track whether or not the strike has
+    // been abandoned.  If it hasn't been abandoned, then we can use the GrGlyph*s as is
+    // otherwise we have to get the new strike, and use that to get the correct glyphs.
+    // Because we do not have the packed ids, and thus can't look up our glyphs in the
+    // new strike, we instead keep our ref to the old strike and use the packed ids from
+    // it.  These ids will still be valid as long as we hold the ref.  When we are done
+    // updating our cache of the GrGlyph*s, we drop our ref on the old strike
+    bool regenerateGlyphs = info.strike()->isAbandoned();
+    bool regenerateTextureCoords = info.atlasGeneration() != currentAtlasGen ||
+                                   regenerateGlyphs;
+    bool regenerateColors = kARGB_GrMaskFormat != info.maskFormat() &&
+                            info.color() != color;
+    bool regeneratePositions = transX != 0.f || transY != 0.f;
+    *glyphCount = info.glyphCount();
+
+    uint32_t regenMaskBits = kNoRegen;
+    regenMaskBits |= regeneratePositions ? kRegenPos : 0;
+    regenMaskBits |= regenerateColors ? kRegenCol : 0;
+    regenMaskBits |= regenerateTextureCoords ? kRegenTex : 0;
+    regenMaskBits |= regenerateGlyphs ? kRegenGlyph : 0;
+    RegenMask regenMask = (RegenMask)regenMaskBits;
+
+    switch (regenMask) {
+        case kRegenPos: this->regenInBatch<true, false, false, false>(REGEN_ARGS); break;
+        case kRegenCol: this->regenInBatch<false, true, false, false>(REGEN_ARGS); break;
+        case kRegenTex: this->regenInBatch<false, false, true, false>(REGEN_ARGS); break;
+        case kRegenGlyph: this->regenInBatch<false, false, true, true>(REGEN_ARGS); break;
+
+            // combinations
+        case kRegenPosCol: this->regenInBatch<true, true, false, false>(REGEN_ARGS); break;
+        case kRegenPosTex: this->regenInBatch<true, false, true, false>(REGEN_ARGS); break;
+        case kRegenPosTexGlyph: this->regenInBatch<true, false, true, true>(REGEN_ARGS); break;
+        case kRegenPosColTex: this->regenInBatch<true, true, true, false>(REGEN_ARGS); break;
+        case kRegenPosColTexGlyph: this->regenInBatch<true, true, true, true>(REGEN_ARGS); break;
+        case kRegenColTex: this->regenInBatch<false, true, true, false>(REGEN_ARGS); break;
+        case kRegenColTexGlyph: this->regenInBatch<false, true, true, true>(REGEN_ARGS); break;
+        case kNoRegen:
+            helper->incGlyphCount(*glyphCount);
+
+            // set use tokens for all of the glyphs in our subrun.  This is only valid if we
+            // have a valid atlas generation
+            fontCache->setUseTokenBulk(*info.bulkUseToken(), target->currentToken(),
+                                        info.maskFormat());
+            break;
+    }
+
+    *byteCount = info.byteCount();
+    *vertices = fVertices + info.vertexStartIndex();
+}