| /* |
| * 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 "GrGpuVertex.h" |
| #include "GrIndexBuffer.h" |
| #include "GrTextStrike.h" |
| #include "GrTextStrike_impl.h" |
| #include "SkPath.h" |
| #include "SkStrokeRec.h" |
| |
| enum { |
| kGlyphMaskStage = GrPaint::kTotalStages, |
| }; |
| |
| void GrTextContext::flushGlyphs() { |
| if (NULL == fDrawTarget) { |
| return; |
| } |
| GrDrawState* drawState = fDrawTarget->drawState(); |
| if (fCurrVertex > 0) { |
| // setup our sampler state for our text texture/atlas |
| GrAssert(GrIsALIGN4(fCurrVertex)); |
| GrAssert(fCurrTexture); |
| GrTextureParams params(SkShader::kRepeat_TileMode, false); |
| drawState->createTextureEffect(kGlyphMaskStage, fCurrTexture, SkMatrix::I(), params); |
| |
| if (!GrPixelConfigIsAlphaOnly(fCurrTexture->config())) { |
| if (kOne_GrBlendCoeff != fPaint.getSrcBlendCoeff() || |
| kISA_GrBlendCoeff != fPaint.getDstBlendCoeff() || |
| fPaint.hasColorStage()) { |
| 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; |
| GrSafeSetNull(fCurrTexture); |
| } |
| drawState->disableStages(); |
| fDrawTarget = NULL; |
| } |
| |
| GrTextContext::GrTextContext(GrContext* context, const GrPaint& paint) : fPaint(paint) { |
| fContext = context; |
| fStrike = NULL; |
| |
| fCurrTexture = NULL; |
| fCurrVertex = 0; |
| |
| const GrClipData* clipData = context->getClip(); |
| |
| GrRect 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 = NULL; |
| |
| fVertices = NULL; |
| fMaxVertices = 0; |
| |
| fVertexLayout = |
| GrDrawTarget::kTextFormat_VertexLayoutBit | |
| GrDrawTarget::StageTexCoordVertexLayoutBit(kGlyphMaskStage, 0); |
| } |
| |
| GrTextContext::~GrTextContext() { |
| this->flushGlyphs(); |
| if (fDrawTarget) { |
| fDrawTarget->drawState()->disableStages(); |
| } |
| } |
| |
| void GrTextContext::flush() { |
| this->flushGlyphs(); |
| } |
| |
| static inline void setRectFan(GrGpuTextVertex v[4], int l, int t, int r, int b, |
| int stride) { |
| v[0 * stride].setI(l, t); |
| v[1 * stride].setI(l, b); |
| v[2 * stride].setI(r, b); |
| v[3 * stride].setI(r, t); |
| } |
| |
| void GrTextContext::drawPackedGlyph(GrGlyph::PackedID packed, |
| GrFixed vx, GrFixed vy, |
| GrFontScaler* scaler) { |
| 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->fAtlas) { |
| 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->fAtlas) { |
| if (fStrike->getGlyphAtlas(glyph, scaler)) { |
| goto HAS_ATLAS; |
| } |
| |
| // before we purge the cache, we must flush any accumulated draws |
| this->flushGlyphs(); |
| fContext->flush(); |
| |
| // try to purge |
| fContext->getFontCache()->purgeExceptFor(fStrike); |
| 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: |
| GrAssert(glyph->fAtlas); |
| |
| // now promote them to fixed |
| width = SkIntToFixed(width); |
| height = SkIntToFixed(height); |
| |
| GrTexture* texture = glyph->fAtlas->texture(); |
| GrAssert(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; |
| bool flush = (NULL != fDrawTarget) && |
| fDrawTarget->geometryHints(fVertexLayout, |
| &fMaxVertices, |
| NULL); |
| if (flush) { |
| this->flushGlyphs(); |
| fContext->flush(); |
| } |
| fDrawTarget = fContext->getTextTarget(fPaint); |
| fMaxVertices = kDefaultRequestedVerts; |
| // ignore return, no point in flushing again. |
| fDrawTarget->geometryHints(fVertexLayout, |
| &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( |
| fVertexLayout, |
| fMaxVertices, |
| 0, |
| GrTCast<void**>(&fVertices), |
| NULL); |
| GrAlwaysAssert(success); |
| } |
| |
| GrFixed tx = SkIntToFixed(glyph->fAtlasLocation.fX); |
| GrFixed ty = SkIntToFixed(glyph->fAtlasLocation.fY); |
| |
| #if GR_TEXT_SCALAR_IS_USHORT |
| int x = vx >> 16; |
| int y = vy >> 16; |
| int w = width >> 16; |
| int h = height >> 16; |
| |
| setRectFan(&fVertices[2*fCurrVertex], x, y, x + w, y + h, 2); |
| setRectFan(&fVertices[2*fCurrVertex+1], |
| texture->normalizeFixedX(tx), |
| texture->normalizeFixedY(ty), |
| texture->normalizeFixedX(tx + width), |
| texture->normalizeFixedY(ty + height), |
| 2); |
| #else |
| fVertices[2*fCurrVertex].setXRectFan(vx, vy, vx + width, vy + height, |
| 2 * sizeof(GrGpuTextVertex)); |
| fVertices[2*fCurrVertex+1].setXRectFan(texture->normalizeFixedX(tx), |
| texture->normalizeFixedY(ty), |
| texture->normalizeFixedX(tx + width), |
| texture->normalizeFixedY(ty + height), |
| 2 * sizeof(GrGpuTextVertex)); |
| #endif |
| fCurrVertex += 4; |
| } |