Split out GrBitmapTextContext from GrTextContext.

src/gpu/GrTextContext.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
-
 #include "GrTextContext.h"
-#include "GrAtlas.h"
-#include "GrContext.h"
-#include "GrDrawTarget.h"
-#include "GrFontScaler.h"
-#include "GrIndexBuffer.h"
-#include "GrTextStrike.h"
-#include "GrTextStrike_impl.h"
-#include "SkPath.h"
-#include "SkRTConf.h"
-#include "SkStrokeRec.h"
-#include "effects/GrCustomCoordsTextureEffect.h"
-
-static const int kGlyphCoordsAttributeIndex = 1;
-
-SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false,
-                "Dump the contents of the font cache before every purge.");
-
-void GrTextContext::flushGlyphs() {
-    if (NULL == fDrawTarget) {
-        return;
-    }
-
-    GrDrawState* drawState = fDrawTarget->drawState();
-    GrDrawState::AutoRestoreEffects are(drawState);
-    drawState->setFromPaint(fPaint, SkMatrix::I(), 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::kNone_FilterMode);
-
-        // This effect could be stored with one of the cache objects (atlas?)
-        drawState->addCoverageEffect(
-                                GrCustomCoordsTextureEffect::Create(fCurrTexture, params),
-                                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");
-            }
-            // setup blend so that we get mask * paintColor + (1-mask)*dstColor
-            drawState->setBlendConstant(fPaint.getColor());
-            drawState->setBlendFunc(kConstC_GrBlendCoeff, kISC_GrBlendCoeff);
-            // don't modulate by the paint's color in the frag since we're
-            // already doing it via the blend const.
-            drawState->setColor(0xffffffff);
-        } 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,
-                                          4, 6);
-        fDrawTarget->resetVertexSource();
-        fVertices = NULL;
-        fMaxVertices = 0;
-        fCurrVertex = 0;
-        SkSafeSetNull(fCurrTexture);
-    }
-}
 
 GrTextContext::GrTextContext(GrContext* context, const GrPaint& paint) : fPaint(paint) {
     fContext = context;
-    fStrike = NULL;
-
-    fCurrTexture = NULL;
-    fCurrVertex = 0;
 
     const GrClipData* clipData = context->getClip();
 
     SkRect devConservativeBound;
     clipData->fClipStack->getConservativeBounds(
                                      -clipData->fOrigin.fX,
                                      -clipData->fOrigin.fY,
                                      context->getRenderTarget()->width(),
                                      context->getRenderTarget()->height(),
                                      &devConservativeBound);
 
     devConservativeBound.roundOut(&fClipRect);
 
-    fAutoMatrix.setIdentity(fContext, &fPaint);
-
     fDrawTarget = fContext->getTextTarget();
-
-    fVertices = NULL;
-    fMaxVertices = 0;
 }
 
-GrTextContext::~GrTextContext() {
-    this->flushGlyphs();
-}
-
-void GrTextContext::flush() {
-    this->flushGlyphs();
-}
-
-namespace {
-
-// position + texture coord
-extern const GrVertexAttrib gTextVertexAttribs[] = {
-    {kVec2f_GrVertexAttribType, 0,               kPosition_GrVertexAttribBinding},
-    {kVec2f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding}
-};
-
-};
-
-void GrTextContext::drawPackedGlyph(GrGlyph::PackedID packed,
-                                    GrFixed vx, GrFixed vy,
-                                    GrFontScaler* scaler) {
-    if (NULL == fDrawTarget) {
-        return;
-    }
-    if (NULL == fStrike) {
-        fStrike = fContext->getFontCache()->getStrike(scaler);
-    }
-
-    GrGlyph* glyph = fStrike->getGlyph(packed, scaler);
-    if (NULL == glyph || glyph->fBounds.isEmpty()) {
-        return;
-    }
-
-    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->getGlyphAtlas(glyph, scaler)) {
-            goto HAS_ATLAS;
-        }
-
-        // try to clear out an unused plot before we flush
-        fContext->getFontCache()->freePlotExceptFor(fStrike);
-        if (fStrike->getGlyphAtlas(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();
-
-        // try to purge
-        fContext->getFontCache()->purgeExceptFor(fStrike);
-        // need to use new flush count here
-        if (fStrike->getGlyphAtlas(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(SkFixedToScalar(vx - SkIntToFixed(glyph->fBounds.fLeft)),
-                               SkFixedToScalar(vy - SkIntToFixed(glyph->fBounds.fTop)));
-        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);
-
-    // now promote them to fixed (TODO: Rethink using fixed pt).
-    width = SkIntToFixed(width);
-    height = SkIntToFixed(height);
-
-    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,
-                                                               0,
-                                                               GrTCast<void**>(&fVertices),
-                                                               NULL);
-        GrAlwaysAssert(success);
-        SkASSERT(2*sizeof(GrPoint) == fDrawTarget->getDrawState().getVertexSize());
-    }
-
-    GrFixed tx = SkIntToFixed(glyph->fAtlasLocation.fX);
-    GrFixed ty = SkIntToFixed(glyph->fAtlasLocation.fY);
-
-    fVertices[2*fCurrVertex].setRectFan(SkFixedToFloat(vx),
-                                        SkFixedToFloat(vy),
-                                        SkFixedToFloat(vx + width),
-                                        SkFixedToFloat(vy + height),
-                                        2 * sizeof(SkPoint));
-    fVertices[2*fCurrVertex+1].setRectFan(SkFixedToFloat(texture->normalizeFixedX(tx)),
-                                          SkFixedToFloat(texture->normalizeFixedY(ty)),
-                                          SkFixedToFloat(texture->normalizeFixedX(tx + width)),
-                                          SkFixedToFloat(texture->normalizeFixedY(ty + height)),
-                                          2 * sizeof(SkPoint));
-    fCurrVertex += 4;
-}