The Tor Browser: gfx/skia/trunk/src/gpu/GrDistanceFieldTextContext.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/GrDistanceFieldTextContext.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/GrDistanceFieldTextContext.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rwxr-xr-x

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * 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 "GrDistanceFieldTextContext.h"
 #include "GrAtlas.h"
 #include "GrDrawTarget.h"
 #include "GrDrawTargetCaps.h"
 #include "GrFontScaler.h"
 #include "SkGlyphCache.h"
 #include "GrIndexBuffer.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
 #include "SkDraw.h"
 #include "SkGpuDevice.h"
 #include "SkPath.h"
 #include "SkRTConf.h"
 #include "SkStrokeRec.h"
 #include "effects/GrDistanceFieldTextureEffect.h"
 static const int kGlyphCoordsAttributeIndex = 1;
 static const int kBaseDFFontSize = 32;
 SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false,
                 "Dump the contents of the font cache before every purge.");
 #if SK_FORCE_DISTANCEFIELD_FONTS
 static const bool kForceDistanceFieldFonts = true;
 #else
 static const bool kForceDistanceFieldFonts = false;
 #endif
 GrDistanceFieldTextContext::GrDistanceFieldTextContext(GrContext* context,
                                                        const SkDeviceProperties& properties)
                                                     : GrTextContext(context, properties) {
     fStrike = NULL;
     fCurrTexture = NULL;
     fCurrVertex = 0;
     fVertices = NULL;
     fMaxVertices = 0;
 }
 GrDistanceFieldTextContext::~GrDistanceFieldTextContext() {
     this->flushGlyphs();
 }
 bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint) {
     return (kForceDistanceFieldFonts || paint.isDistanceFieldTextTEMP()) &&
            !paint.getRasterizer() && !paint.getMaskFilter() &&
            paint.getStyle() == SkPaint::kFill_Style &&
            fContext->getTextTarget()->caps()->shaderDerivativeSupport() &&
            !SkDraw::ShouldDrawTextAsPaths(paint, fContext->getMatrix());
 }
 static inline GrColor skcolor_to_grcolor_nopremultiply(SkColor c) {
     unsigned r = SkColorGetR(c);
     unsigned g = SkColorGetG(c);
     unsigned b = SkColorGetB(c);
     return GrColorPackRGBA(r, g, b, 0xff);
 }
 void GrDistanceFieldTextContext::flushGlyphs() {
     if (NULL == fDrawTarget) {
         return;
     }
     GrDrawState* drawState = fDrawTarget->drawState();
     GrDrawState::AutoRestoreEffects are(drawState);
     drawState->setFromPaint(fPaint, fContext->getMatrix(), fContext->getRenderTarget());
     if (fCurrVertex > 0) {
         // setup our sampler state for our text texture/atlas
         SkASSERT(GrIsALIGN4(fCurrVertex));
         SkASSERT(fCurrTexture);
         GrTextureParams params(SkShader::kRepeat_TileMode, GrTextureParams::kBilerp_FilterMode);
         // This effect could be stored with one of the cache objects (atlas?)
         SkISize size = fStrike->getAtlasSize();
         drawState->addCoverageEffect(
                                 GrDistanceFieldTextureEffect::Create(fCurrTexture, params, size),
                                 kGlyphCoordsAttributeIndex)->unref();
         if (!GrPixelConfigIsAlphaOnly(fCurrTexture->config())) {
             if (kOne_GrBlendCoeff != fPaint.getSrcBlendCoeff() ||
                 kISA_GrBlendCoeff != fPaint.getDstBlendCoeff() ||
                 fPaint.numColorStages()) {
                 GrPrintf("LCD Text will not draw correctly.\n");
             }
             // 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
             drawState->setColor(SkColorSetARGB(a, a, a, a));
             // paintColor
             drawState->setBlendConstant(skcolor_to_grcolor_nopremultiply(fSkPaint.getColor()));
             drawState->setBlendFunc(kConstC_GrBlendCoeff, kISC_GrBlendCoeff);
         } else {
             // set back to normal in case we took LCD path previously.
             drawState->setBlendFunc(fPaint.getSrcBlendCoeff(), fPaint.getDstBlendCoeff());
             drawState->setColor(fPaint.getColor());
         }
         int nGlyphs = fCurrVertex / 4;
         fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
         fDrawTarget->drawIndexedInstances(kTriangles_GrPrimitiveType,
                                           nGlyphs,
 , 6);
         fDrawTarget->resetVertexSource();
         fVertices = NULL;
         fMaxVertices = 0;
         fCurrVertex = 0;
         SkSafeSetNull(fCurrTexture);
     }
 }
 namespace {
 // position + texture coord
 extern const GrVertexAttrib gTextVertexAttribs[] = {
     {kVec2f_GrVertexAttribType, 0,               kPosition_GrVertexAttribBinding},
     {kVec2f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding}
 };
 };
 void GrDistanceFieldTextContext::drawPackedGlyph(GrGlyph::PackedID packed,
                                                  GrFixed vx, GrFixed vy,
                                                  GrFontScaler* scaler) {
     if (NULL == fDrawTarget) {
         return;
     }
     if (NULL == fStrike) {
         fStrike = fContext->getFontCache()->getStrike(scaler, true);
     }
     GrGlyph* glyph = fStrike->getGlyph(packed, scaler);
     if (NULL == glyph || glyph->fBounds.isEmpty()) {
         return;
     }
     SkScalar sx = SkFixedToScalar(vx);
     SkScalar sy = SkFixedToScalar(vy);
 /*
     // not valid, need to find a different solution for this
     vx += SkIntToFixed(glyph->fBounds.fLeft);
     vy += SkIntToFixed(glyph->fBounds.fTop);
     // keep them as ints until we've done the clip-test
     GrFixed width = glyph->fBounds.width();
     GrFixed height = glyph->fBounds.height();
     // check if we clipped out
     if (true || NULL == glyph->fPlot) {
         int x = vx >> 16;
         int y = vy >> 16;
         if (fClipRect.quickReject(x, y, x + width, y + height)) {
 //            SkCLZ(3);    // so we can set a break-point in the debugger
             return;
         }
     }
 */
     if (NULL == glyph->fPlot) {
         if (fStrike->addGlyphToAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
         // try to clear out an unused plot before we flush
         if (fContext->getFontCache()->freeUnusedPlot(fStrike) &&
             fStrike->addGlyphToAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
         if (c_DumpFontCache) {
 #ifdef SK_DEVELOPER
             fContext->getFontCache()->dump();
 #endif
         }
         // before we purge the cache, we must flush any accumulated draws
         this->flushGlyphs();
         fContext->flush();
         // we should have an unused plot now
         if (fContext->getFontCache()->freeUnusedPlot(fStrike) &&
             fStrike->addGlyphToAtlas(glyph, scaler)) {
             goto HAS_ATLAS;
         }
         if (NULL == glyph->fPath) {
             SkPath* path = SkNEW(SkPath);
             if (!scaler->getGlyphPath(glyph->glyphID(), path)) {
                 // flag the glyph as being dead?
                 delete path;
                 return;
             }
             glyph->fPath = path;
         }
         GrContext::AutoMatrix am;
         SkMatrix translate;
         translate.setTranslate(sx, sy);
         GrPaint tmpPaint(fPaint);
         am.setPreConcat(fContext, translate, &tmpPaint);
         SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
         fContext->drawPath(tmpPaint, *glyph->fPath, stroke);
         return;
     }
 HAS_ATLAS:
     SkASSERT(glyph->fPlot);
     GrDrawTarget::DrawToken drawToken = fDrawTarget->getCurrentDrawToken();
     glyph->fPlot->setDrawToken(drawToken);
     GrTexture* texture = glyph->fPlot->texture();
     SkASSERT(texture);
     if (fCurrTexture != texture || fCurrVertex + 4 > fMaxVertices) {
         this->flushGlyphs();
         fCurrTexture = texture;
         fCurrTexture->ref();
     }
     if (NULL == fVertices) {
        // If we need to reserve vertices allow the draw target to suggest
         // a number of verts to reserve and whether to perform a flush.
         fMaxVertices = kMinRequestedVerts;
         fDrawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>(
             SK_ARRAY_COUNT(gTextVertexAttribs));
         bool flush = fDrawTarget->geometryHints(&fMaxVertices, NULL);
         if (flush) {
             this->flushGlyphs();
             fContext->flush();
             fDrawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>(
                 SK_ARRAY_COUNT(gTextVertexAttribs));
         }
         fMaxVertices = kDefaultRequestedVerts;
         // ignore return, no point in flushing again.
         fDrawTarget->geometryHints(&fMaxVertices, NULL);
         int maxQuadVertices = 4 * fContext->getQuadIndexBuffer()->maxQuads();
         if (fMaxVertices < kMinRequestedVerts) {
             fMaxVertices = kDefaultRequestedVerts;
         } else if (fMaxVertices > maxQuadVertices) {
             // don't exceed the limit of the index buffer
             fMaxVertices = maxQuadVertices;
         }
         bool success = fDrawTarget->reserveVertexAndIndexSpace(fMaxVertices,
 ,
                                                                GrTCast<void**>(&fVertices),
                                                                NULL);
         GrAlwaysAssert(success);
         SkASSERT(2*sizeof(GrPoint) == fDrawTarget->getDrawState().getVertexSize());
     }
     SkScalar dx = SkIntToScalar(glyph->fBounds.fLeft);
     SkScalar dy = SkIntToScalar(glyph->fBounds.fTop);
     SkScalar width = SkIntToScalar(glyph->fBounds.width());
     SkScalar height = SkIntToScalar(glyph->fBounds.height());
     SkScalar scale = fTextRatio;
     dx *= scale;
     dy *= scale;
     sx += dx;
     sy += dy;
     width *= scale;
     height *= scale;
     GrFixed tx = SkIntToFixed(glyph->fAtlasLocation.fX);
     GrFixed ty = SkIntToFixed(glyph->fAtlasLocation.fY);
     GrFixed tw = SkIntToFixed(glyph->fBounds.width());
     GrFixed th = SkIntToFixed(glyph->fBounds.height());
     static const size_t kVertexSize = 2 * sizeof(SkPoint);
     fVertices[2*fCurrVertex].setRectFan(sx,
                                         sy,
                                         sx + width,
                                         sy + height,
                                         kVertexSize);
     fVertices[2*fCurrVertex+1].setRectFan(SkFixedToFloat(texture->normalizeFixedX(tx)),
                                           SkFixedToFloat(texture->normalizeFixedY(ty)),
                                           SkFixedToFloat(texture->normalizeFixedX(tx + tw)),
                                           SkFixedToFloat(texture->normalizeFixedY(ty + th)),
                                           kVertexSize);
     fCurrVertex += 4;
 }
 inline void GrDistanceFieldTextContext::init(const GrPaint& paint, const SkPaint& skPaint) {
     GrTextContext::init(paint, skPaint);
     fStrike = NULL;
     fCurrTexture = NULL;
     fCurrVertex = 0;
     fVertices = NULL;
     fMaxVertices = 0;
     fTextRatio = fSkPaint.getTextSize()/kBaseDFFontSize;
     fSkPaint.setTextSize(SkIntToScalar(kBaseDFFontSize));
     fSkPaint.setLCDRenderText(false);
     fSkPaint.setAutohinted(false);
     fSkPaint.setSubpixelText(true);
 }
 inline void GrDistanceFieldTextContext::finish() {
     flushGlyphs();
     GrTextContext::finish();
 }
 void GrDistanceFieldTextContext::drawText(const GrPaint& paint, const SkPaint& skPaint,
                                           const char text[], size_t byteLength,
                                           SkScalar x, SkScalar y) {
     SkASSERT(byteLength == 0 || text != NULL);
     // nothing to draw or can't draw
     if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/
         || fSkPaint.getRasterizer()) {
         return;
     }
     this->init(paint, skPaint);
     SkScalar sizeRatio = fTextRatio;
     SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
     SkAutoGlyphCache    autoCache(fSkPaint, &fDeviceProperties, NULL);
     SkGlyphCache*       cache = autoCache.getCache();
     GrFontScaler*       fontScaler = GetGrFontScaler(cache);
     // need to measure first
     // TODO - generate positions and pre-load cache as well?
     const char* stop = text + byteLength;
     if (fSkPaint.getTextAlign() != SkPaint::kLeft_Align) {
         SkFixed    stopX = 0;
         SkFixed    stopY = 0;
         const char* textPtr = text;
         while (textPtr < stop) {
             // don't need x, y here, since all subpixel variants will have the
             // same advance
             const SkGlyph& glyph = glyphCacheProc(cache, &textPtr, 0, 0);
             stopX += glyph.fAdvanceX;
             stopY += glyph.fAdvanceY;
         }
         SkASSERT(textPtr == stop);
         SkScalar alignX = SkFixedToScalar(stopX)*sizeRatio;
         SkScalar alignY = SkFixedToScalar(stopY)*sizeRatio;
         if (fSkPaint.getTextAlign() == SkPaint::kCenter_Align) {
             alignX = SkScalarHalf(alignX);
             alignY = SkScalarHalf(alignY);
         }
         x -= alignX;
         y -= alignY;
     }
     SkFixed fx = SkScalarToFixed(x) + SK_FixedHalf;
     SkFixed fy = SkScalarToFixed(y) + SK_FixedHalf;
     SkFixed fixedScale = SkScalarToFixed(sizeRatio);
     while (text < stop) {
         const SkGlyph& glyph = glyphCacheProc(cache, &text, fx, fy);
         if (glyph.fWidth) {
             this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
                                                 glyph.getSubXFixed(),
                                                 glyph.getSubYFixed()),
                                   SkFixedFloorToFixed(fx),
                                   SkFixedFloorToFixed(fy),
                                   fontScaler);
         }
         fx += SkFixedMul_portable(glyph.fAdvanceX, fixedScale);
         fy += SkFixedMul_portable(glyph.fAdvanceY, fixedScale);
     }
     this->finish();
 }
 void GrDistanceFieldTextContext::drawPosText(const GrPaint& paint, const SkPaint& skPaint,
                                              const char text[], size_t byteLength,
                                              const SkScalar pos[], SkScalar constY,
                                              int scalarsPerPosition) {
     SkASSERT(byteLength == 0 || text != NULL);
     SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
     // nothing to draw
     if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/) {
         return;
     }
     this->init(paint, skPaint);
     SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();
     SkAutoGlyphCache    autoCache(fSkPaint, &fDeviceProperties, NULL);
     SkGlyphCache*       cache = autoCache.getCache();
     GrFontScaler*       fontScaler = GetGrFontScaler(cache);
     const char*        stop = text + byteLength;
     if (SkPaint::kLeft_Align == fSkPaint.getTextAlign()) {
         while (text < stop) {
             // the last 2 parameters are ignored
             const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
             if (glyph.fWidth) {
                 SkScalar x = pos[0];
                 SkScalar y = scalarsPerPosition == 1 ? constY : pos[1];
                 this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
                                                     glyph.getSubXFixed(),
                                                     glyph.getSubYFixed()),
                                       SkScalarToFixed(x) + SK_FixedHalf, //d1g.fHalfSampleX,
                                       SkScalarToFixed(y) + SK_FixedHalf, //d1g.fHalfSampleY,
                                       fontScaler);
             }
             pos += scalarsPerPosition;
         }
     } else {
         int alignShift = SkPaint::kCenter_Align == fSkPaint.getTextAlign() ? 1 : 0;
         while (text < stop) {
             // the last 2 parameters are ignored
             const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
             if (glyph.fWidth) {
                 SkScalar x = pos[0];
                 SkScalar y = scalarsPerPosition == 1 ? constY : pos[1];
                 this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
                                                     glyph.getSubXFixed(),
                                                     glyph.getSubYFixed()),
                                       SkScalarToFixed(x) - (glyph.fAdvanceX >> alignShift)
                                         + SK_FixedHalf, //d1g.fHalfSampleX,
                                       SkScalarToFixed(y) - (glyph.fAdvanceY >> alignShift)
                                         + SK_FixedHalf, //d1g.fHalfSampleY,
                                       fontScaler);
             }
             pos += scalarsPerPosition;
         }
     }
     this->finish();
 }

The Tor Browser / annotate

gfx/skia/trunk/src/gpu/GrDistanceFieldTextContext.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/GrDistanceFieldTextContext.cpp