9b855c7c95
git-svn-id: http://skia.googlecode.com/svn/trunk@7929 2bbb7eff-a529-9590-31e7-b0007b416f81
90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
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/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "GrAndroidPathRenderer.h"
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#include "AndroidPathRenderer.h"
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#include "Vertex.h"
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GrAndroidPathRenderer::GrAndroidPathRenderer() {
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}
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bool GrAndroidPathRenderer::canDrawPath(const SkPath& path,
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const SkStrokeRec& stroke,
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const GrDrawTarget* target,
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bool antiAlias) const {
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return ((stroke.isFillStyle() || stroke.getStyle() == SkStrokeRec::kStroke_Style)
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&& !path.isInverseFillType() && path.isConvex());
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}
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struct ColorVertex {
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SkPoint pos;
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GrColor color;
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};
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bool GrAndroidPathRenderer::onDrawPath(const SkPath& origPath,
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const SkStrokeRec& stroke,
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GrDrawTarget* target,
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bool antiAlias) {
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// generate verts using Android algorithm
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android::uirenderer::VertexBuffer vertices;
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android::uirenderer::PathRenderer::ConvexPathVertices(origPath, stroke, antiAlias, NULL,
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&vertices);
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// set vertex attributes depending on anti-alias
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GrDrawState* drawState = target->drawState();
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if (antiAlias) {
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// position + coverage
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GrVertexAttrib attribs[] = {
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GrVertexAttrib(kVec2f_GrVertexAttribType, 0),
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GrVertexAttrib(kVec4ub_GrVertexAttribType, sizeof(GrPoint))
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};
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drawState->setVertexAttribs(attribs, SK_ARRAY_COUNT(attribs));
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drawState->setAttribIndex(GrDrawState::kPosition_AttribIndex, 0);
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drawState->setAttribIndex(GrDrawState::kCoverage_AttribIndex, 1);
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drawState->setAttribBindings(GrDrawState::kCoverage_AttribBindingsBit);
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} else {
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drawState->setDefaultVertexAttribs();
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}
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// allocate our vert buffer
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int vertCount = vertices.getSize();
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GrDrawTarget::AutoReleaseGeometry geo(target, vertCount, 0);
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if (!geo.succeeded()) {
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GrPrintf("Failed to get space for vertices!\n");
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return false;
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}
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// copy android verts to our vertex buffer
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if (antiAlias) {
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GrAssert(sizeof(ColorVertex) == drawState->getVertexSize());
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ColorVertex* outVert = reinterpret_cast<ColorVertex*>(geo.vertices());
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android::uirenderer::AlphaVertex* inVert =
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reinterpret_cast<android::uirenderer::AlphaVertex*>(vertices.getBuffer());
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for (int i = 0; i < vertCount; ++i) {
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// copy vertex position
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outVert->pos.set(inVert->position[0], inVert->position[1]);
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// copy alpha
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int coverage = static_cast<int>(inVert->alpha * 0xff);
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outVert->color = GrColorPackRGBA(coverage, coverage, coverage, coverage);
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++outVert;
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++inVert;
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}
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} else {
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size_t vsize = drawState->getVertexSize();
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size_t copySize = vsize*vertCount;
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memcpy(geo.vertices(), vertices.getBuffer(), copySize);
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}
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// render it
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target->drawNonIndexed(kTriangleStrip_GrPrimitiveType, 0, vertCount);
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return true;
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}
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