/* * Copyright 2012 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "GrAARectRenderer.h" #include "GrDefaultGeoProcFactory.h" #include "GrGeometryProcessor.h" #include "GrGpu.h" #include "GrInvariantOutput.h" #include "GrTBackendProcessorFactory.h" #include "SkColorPriv.h" #include "gl/GrGLProcessor.h" #include "gl/GrGLGeometryProcessor.h" #include "gl/builders/GrGLProgramBuilder.h" /////////////////////////////////////////////////////////////////////////////// namespace { // Should the coverage be multiplied into the color attrib or use a separate attrib. enum CoverageAttribType { kUseColor_CoverageAttribType, kUseCoverage_CoverageAttribType, }; } static CoverageAttribType set_rect_attribs(GrDrawState* drawState) { if (drawState->canTweakAlphaForCoverage()) { drawState->setGeometryProcessor( GrDefaultGeoProcFactory::CreateAndSetAttribs( drawState, GrDefaultGeoProcFactory::kColor_GPType))->unref(); return kUseColor_CoverageAttribType; } else { drawState->setGeometryProcessor( GrDefaultGeoProcFactory::CreateAndSetAttribs( drawState, GrDefaultGeoProcFactory::kColor_GPType | GrDefaultGeoProcFactory::kCoverage_GPType))->unref(); return kUseCoverage_CoverageAttribType; } } static void set_inset_fan(SkPoint* pts, size_t stride, const SkRect& r, SkScalar dx, SkScalar dy) { pts->setRectFan(r.fLeft + dx, r.fTop + dy, r.fRight - dx, r.fBottom - dy, stride); } void GrAARectRenderer::reset() { SkSafeSetNull(fAAFillRectIndexBuffer); SkSafeSetNull(fAAMiterStrokeRectIndexBuffer); SkSafeSetNull(fAABevelStrokeRectIndexBuffer); } static const uint16_t gFillAARectIdx[] = { 0, 1, 5, 5, 4, 0, 1, 2, 6, 6, 5, 1, 2, 3, 7, 7, 6, 2, 3, 0, 4, 4, 7, 3, 4, 5, 6, 6, 7, 4, }; static const int kIndicesPerAAFillRect = SK_ARRAY_COUNT(gFillAARectIdx); static const int kVertsPerAAFillRect = 8; static const int kNumAAFillRectsInIndexBuffer = 256; static const uint16_t gMiterStrokeAARectIdx[] = { 0 + 0, 1 + 0, 5 + 0, 5 + 0, 4 + 0, 0 + 0, 1 + 0, 2 + 0, 6 + 0, 6 + 0, 5 + 0, 1 + 0, 2 + 0, 3 + 0, 7 + 0, 7 + 0, 6 + 0, 2 + 0, 3 + 0, 0 + 0, 4 + 0, 4 + 0, 7 + 0, 3 + 0, 0 + 4, 1 + 4, 5 + 4, 5 + 4, 4 + 4, 0 + 4, 1 + 4, 2 + 4, 6 + 4, 6 + 4, 5 + 4, 1 + 4, 2 + 4, 3 + 4, 7 + 4, 7 + 4, 6 + 4, 2 + 4, 3 + 4, 0 + 4, 4 + 4, 4 + 4, 7 + 4, 3 + 4, 0 + 8, 1 + 8, 5 + 8, 5 + 8, 4 + 8, 0 + 8, 1 + 8, 2 + 8, 6 + 8, 6 + 8, 5 + 8, 1 + 8, 2 + 8, 3 + 8, 7 + 8, 7 + 8, 6 + 8, 2 + 8, 3 + 8, 0 + 8, 4 + 8, 4 + 8, 7 + 8, 3 + 8, }; static const int kIndicesPerMiterStrokeRect = SK_ARRAY_COUNT(gMiterStrokeAARectIdx); static const int kVertsPerMiterStrokeRect = 16; static const int kNumMiterStrokeRectsInIndexBuffer = 256; /** * As in miter-stroke, index = a + b, and a is the current index, b is the shift * from the first index. The index layout: * outer AA line: 0~3, 4~7 * outer edge: 8~11, 12~15 * inner edge: 16~19 * inner AA line: 20~23 * Following comes a bevel-stroke rect and its indices: * * 4 7 * ********************************* * * ______________________________ * * * / 12 15 \ * * * / \ * * 0 * |8 16_____________________19 11 | * 3 * * | | | | * * * | | **************** | | * * * | | * 20 23 * | | * * * | | * * | | * * * | | * 21 22 * | | * * * | | **************** | | * * * | |____________________| | * * 1 * |9 17 18 10| * 2 * * \ / * * * \13 __________________________14/ * * * * * ********************************** * 5 6 */ static const uint16_t gBevelStrokeAARectIdx[] = { // Draw outer AA, from outer AA line to outer edge, shift is 0. 0 + 0, 1 + 0, 9 + 0, 9 + 0, 8 + 0, 0 + 0, 1 + 0, 5 + 0, 13 + 0, 13 + 0, 9 + 0, 1 + 0, 5 + 0, 6 + 0, 14 + 0, 14 + 0, 13 + 0, 5 + 0, 6 + 0, 2 + 0, 10 + 0, 10 + 0, 14 + 0, 6 + 0, 2 + 0, 3 + 0, 11 + 0, 11 + 0, 10 + 0, 2 + 0, 3 + 0, 7 + 0, 15 + 0, 15 + 0, 11 + 0, 3 + 0, 7 + 0, 4 + 0, 12 + 0, 12 + 0, 15 + 0, 7 + 0, 4 + 0, 0 + 0, 8 + 0, 8 + 0, 12 + 0, 4 + 0, // Draw the stroke, from outer edge to inner edge, shift is 8. 0 + 8, 1 + 8, 9 + 8, 9 + 8, 8 + 8, 0 + 8, 1 + 8, 5 + 8, 9 + 8, 5 + 8, 6 + 8, 10 + 8, 10 + 8, 9 + 8, 5 + 8, 6 + 8, 2 + 8, 10 + 8, 2 + 8, 3 + 8, 11 + 8, 11 + 8, 10 + 8, 2 + 8, 3 + 8, 7 + 8, 11 + 8, 7 + 8, 4 + 8, 8 + 8, 8 + 8, 11 + 8, 7 + 8, 4 + 8, 0 + 8, 8 + 8, // Draw the inner AA, from inner edge to inner AA line, shift is 16. 0 + 16, 1 + 16, 5 + 16, 5 + 16, 4 + 16, 0 + 16, 1 + 16, 2 + 16, 6 + 16, 6 + 16, 5 + 16, 1 + 16, 2 + 16, 3 + 16, 7 + 16, 7 + 16, 6 + 16, 2 + 16, 3 + 16, 0 + 16, 4 + 16, 4 + 16, 7 + 16, 3 + 16, }; static const int kIndicesPerBevelStrokeRect = SK_ARRAY_COUNT(gBevelStrokeAARectIdx); static const int kVertsPerBevelStrokeRect = 24; static const int kNumBevelStrokeRectsInIndexBuffer = 256; static int aa_stroke_rect_index_count(bool miterStroke) { return miterStroke ? SK_ARRAY_COUNT(gMiterStrokeAARectIdx) : SK_ARRAY_COUNT(gBevelStrokeAARectIdx); } GrIndexBuffer* GrAARectRenderer::aaStrokeRectIndexBuffer(bool miterStroke) { if (miterStroke) { if (NULL == fAAMiterStrokeRectIndexBuffer) { fAAMiterStrokeRectIndexBuffer = fGpu->createInstancedIndexBuffer(gMiterStrokeAARectIdx, kIndicesPerMiterStrokeRect, kNumMiterStrokeRectsInIndexBuffer, kVertsPerMiterStrokeRect); } return fAAMiterStrokeRectIndexBuffer; } else { if (NULL == fAABevelStrokeRectIndexBuffer) { fAABevelStrokeRectIndexBuffer = fGpu->createInstancedIndexBuffer(gBevelStrokeAARectIdx, kIndicesPerBevelStrokeRect, kNumBevelStrokeRectsInIndexBuffer, kVertsPerBevelStrokeRect); } return fAABevelStrokeRectIndexBuffer; } } void GrAARectRenderer::geometryFillAARect(GrDrawTarget* target, GrDrawState* drawState, const SkRect& rect, const SkMatrix& combinedMatrix, const SkRect& devRect) { GrDrawState::AutoRestoreEffects are(drawState); GrColor color = drawState->getColor(); CoverageAttribType covAttribType = set_rect_attribs(drawState); if (kUseCoverage_CoverageAttribType == covAttribType && GrColorIsOpaque(color)) { drawState->setHint(GrDrawState::kVertexColorsAreOpaque_Hint, true); } GrDrawTarget::AutoReleaseGeometry geo(target, 8, drawState->getVertexStride(), 0); if (!geo.succeeded()) { SkDebugf("Failed to get space for vertices!\n"); return; } if (NULL == fAAFillRectIndexBuffer) { fAAFillRectIndexBuffer = fGpu->createInstancedIndexBuffer(gFillAARectIdx, kIndicesPerAAFillRect, kNumAAFillRectsInIndexBuffer, kVertsPerAAFillRect); } GrIndexBuffer* indexBuffer = fAAFillRectIndexBuffer; if (NULL == indexBuffer) { SkDebugf("Failed to create index buffer!\n"); return; } intptr_t verts = reinterpret_cast(geo.vertices()); size_t vstride = drawState->getVertexStride(); SkPoint* fan0Pos = reinterpret_cast(verts); SkPoint* fan1Pos = reinterpret_cast(verts + 4 * vstride); SkScalar inset = SkMinScalar(devRect.width(), SK_Scalar1); inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height()); if (combinedMatrix.rectStaysRect()) { // Temporarily #if'ed out. We don't want to pass in the devRect but // right now it is computed in GrContext::apply_aa_to_rect and we don't // want to throw away the work #if 0 SkRect devRect; combinedMatrix.mapRect(&devRect, rect); #endif set_inset_fan(fan0Pos, vstride, devRect, -SK_ScalarHalf, -SK_ScalarHalf); set_inset_fan(fan1Pos, vstride, devRect, inset, inset); } else { // compute transformed (1, 0) and (0, 1) vectors SkVector vec[2] = { { combinedMatrix[SkMatrix::kMScaleX], combinedMatrix[SkMatrix::kMSkewY] }, { combinedMatrix[SkMatrix::kMSkewX], combinedMatrix[SkMatrix::kMScaleY] } }; vec[0].normalize(); vec[0].scale(SK_ScalarHalf); vec[1].normalize(); vec[1].scale(SK_ScalarHalf); // create the rotated rect fan0Pos->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vstride); combinedMatrix.mapPointsWithStride(fan0Pos, vstride, 4); // Now create the inset points and then outset the original // rotated points // TL *((SkPoint*)((intptr_t)fan1Pos + 0 * vstride)) = *((SkPoint*)((intptr_t)fan0Pos + 0 * vstride)) + vec[0] + vec[1]; *((SkPoint*)((intptr_t)fan0Pos + 0 * vstride)) -= vec[0] + vec[1]; // BL *((SkPoint*)((intptr_t)fan1Pos + 1 * vstride)) = *((SkPoint*)((intptr_t)fan0Pos + 1 * vstride)) + vec[0] - vec[1]; *((SkPoint*)((intptr_t)fan0Pos + 1 * vstride)) -= vec[0] - vec[1]; // BR *((SkPoint*)((intptr_t)fan1Pos + 2 * vstride)) = *((SkPoint*)((intptr_t)fan0Pos + 2 * vstride)) - vec[0] - vec[1]; *((SkPoint*)((intptr_t)fan0Pos + 2 * vstride)) += vec[0] + vec[1]; // TR *((SkPoint*)((intptr_t)fan1Pos + 3 * vstride)) = *((SkPoint*)((intptr_t)fan0Pos + 3 * vstride)) - vec[0] + vec[1]; *((SkPoint*)((intptr_t)fan0Pos + 3 * vstride)) += vec[0] - vec[1]; } // Make verts point to vertex color and then set all the color and coverage vertex attrs values. verts += sizeof(SkPoint); for (int i = 0; i < 4; ++i) { if (kUseCoverage_CoverageAttribType == covAttribType) { *reinterpret_cast(verts + i * vstride) = color; *reinterpret_cast(verts + i * vstride + sizeof(GrColor)) = 0; } else { *reinterpret_cast(verts + i * vstride) = 0; } } int scale; if (inset < SK_ScalarHalf) { scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf)); SkASSERT(scale >= 0 && scale <= 255); } else { scale = 0xff; } verts += 4 * vstride; float innerCoverage = GrNormalizeByteToFloat(scale); GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale); for (int i = 0; i < 4; ++i) { if (kUseCoverage_CoverageAttribType == covAttribType) { *reinterpret_cast(verts + i * vstride) = color; *reinterpret_cast(verts + i * vstride + sizeof(GrColor)) = innerCoverage; } else { *reinterpret_cast(verts + i * vstride) = scaledColor; } } target->setIndexSourceToBuffer(indexBuffer); target->drawIndexedInstances(drawState, kTriangles_GrPrimitiveType, 1, kVertsPerAAFillRect, kIndicesPerAAFillRect); target->resetIndexSource(); } void GrAARectRenderer::strokeAARect(GrDrawTarget* target, GrDrawState* drawState, const SkRect& rect, const SkMatrix& combinedMatrix, const SkRect& devRect, const SkStrokeRec& stroke) { SkVector devStrokeSize; SkScalar width = stroke.getWidth(); if (width > 0) { devStrokeSize.set(width, width); combinedMatrix.mapVectors(&devStrokeSize, 1); devStrokeSize.setAbs(devStrokeSize); } else { devStrokeSize.set(SK_Scalar1, SK_Scalar1); } const SkScalar dx = devStrokeSize.fX; const SkScalar dy = devStrokeSize.fY; const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf); const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf); // Temporarily #if'ed out. We don't want to pass in the devRect but // right now it is computed in GrContext::apply_aa_to_rect and we don't // want to throw away the work #if 0 SkRect devRect; combinedMatrix.mapRect(&devRect, rect); #endif SkScalar spare; { SkScalar w = devRect.width() - dx; SkScalar h = devRect.height() - dy; spare = SkTMin(w, h); } SkRect devOutside(devRect); devOutside.outset(rx, ry); bool miterStroke = true; // For hairlines, make bevel and round joins appear the same as mitered ones. // small miter limit means right angles show bevel... if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join || stroke.getMiter() < SK_ScalarSqrt2)) { miterStroke = false; } if (spare <= 0 && miterStroke) { this->fillAARect(target, drawState, devOutside, SkMatrix::I(), devOutside); return; } SkRect devInside(devRect); devInside.inset(rx, ry); SkRect devOutsideAssist(devRect); // For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist) // to draw the outer of the rect. Because there are 8 vertices on the outer // edge, while vertex number of inner edge is 4, the same as miter-stroke. if (!miterStroke) { devOutside.inset(0, ry); devOutsideAssist.outset(0, ry); } this->geometryStrokeAARect(target, drawState, devOutside, devOutsideAssist, devInside, miterStroke); } void GrAARectRenderer::geometryStrokeAARect(GrDrawTarget* target, GrDrawState* drawState, const SkRect& devOutside, const SkRect& devOutsideAssist, const SkRect& devInside, bool miterStroke) { GrDrawState::AutoRestoreEffects are(drawState); CoverageAttribType covAttribType = set_rect_attribs(drawState); GrColor color = drawState->getColor(); if (kUseCoverage_CoverageAttribType == covAttribType && GrColorIsOpaque(color)) { drawState->setHint(GrDrawState::kVertexColorsAreOpaque_Hint, true); } int innerVertexNum = 4; int outerVertexNum = miterStroke ? 4 : 8; int totalVertexNum = (outerVertexNum + innerVertexNum) * 2; GrDrawTarget::AutoReleaseGeometry geo(target, totalVertexNum, drawState->getVertexStride(), 0); if (!geo.succeeded()) { SkDebugf("Failed to get space for vertices!\n"); return; } GrIndexBuffer* indexBuffer = this->aaStrokeRectIndexBuffer(miterStroke); if (NULL == indexBuffer) { SkDebugf("Failed to create index buffer!\n"); return; } intptr_t verts = reinterpret_cast(geo.vertices()); size_t vstride = drawState->getVertexStride(); // We create vertices for four nested rectangles. There are two ramps from 0 to full // coverage, one on the exterior of the stroke and the other on the interior. // The following pointers refer to the four rects, from outermost to innermost. SkPoint* fan0Pos = reinterpret_cast(verts); SkPoint* fan1Pos = reinterpret_cast(verts + outerVertexNum * vstride); SkPoint* fan2Pos = reinterpret_cast(verts + 2 * outerVertexNum * vstride); SkPoint* fan3Pos = reinterpret_cast(verts + (2 * outerVertexNum + innerVertexNum) * vstride); #ifndef SK_IGNORE_THIN_STROKED_RECT_FIX // TODO: this only really works if the X & Y margins are the same all around // the rect (or if they are all >= 1.0). SkScalar inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight); inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft); inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop); if (miterStroke) { inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom); } else { inset = SK_ScalarHalf * SkMinScalar(inset, devOutsideAssist.fBottom - devInside.fBottom); } SkASSERT(inset >= 0); #else SkScalar inset = SK_ScalarHalf; #endif if (miterStroke) { // outermost set_inset_fan(fan0Pos, vstride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf); // inner two set_inset_fan(fan1Pos, vstride, devOutside, inset, inset); set_inset_fan(fan2Pos, vstride, devInside, -inset, -inset); // innermost set_inset_fan(fan3Pos, vstride, devInside, SK_ScalarHalf, SK_ScalarHalf); } else { SkPoint* fan0AssistPos = reinterpret_cast(verts + 4 * vstride); SkPoint* fan1AssistPos = reinterpret_cast(verts + (outerVertexNum + 4) * vstride); // outermost set_inset_fan(fan0Pos, vstride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf); set_inset_fan(fan0AssistPos, vstride, devOutsideAssist, -SK_ScalarHalf, -SK_ScalarHalf); // outer one of the inner two set_inset_fan(fan1Pos, vstride, devOutside, inset, inset); set_inset_fan(fan1AssistPos, vstride, devOutsideAssist, inset, inset); // inner one of the inner two set_inset_fan(fan2Pos, vstride, devInside, -inset, -inset); // innermost set_inset_fan(fan3Pos, vstride, devInside, SK_ScalarHalf, SK_ScalarHalf); } // Make verts point to vertex color and then set all the color and coverage vertex attrs values. // The outermost rect has 0 coverage verts += sizeof(SkPoint); for (int i = 0; i < outerVertexNum; ++i) { if (kUseCoverage_CoverageAttribType == covAttribType) { *reinterpret_cast(verts + i * vstride) = color; *reinterpret_cast(verts + i * vstride + sizeof(GrColor)) = 0; } else { *reinterpret_cast(verts + i * vstride) = 0; } } // scale is the coverage for the the inner two rects. int scale; if (inset < SK_ScalarHalf) { scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf)); SkASSERT(scale >= 0 && scale <= 255); } else { scale = 0xff; } float innerCoverage = GrNormalizeByteToFloat(scale); GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale); verts += outerVertexNum * vstride; for (int i = 0; i < outerVertexNum + innerVertexNum; ++i) { if (kUseCoverage_CoverageAttribType == covAttribType) { *reinterpret_cast(verts + i * vstride) = color; *reinterpret_cast(verts + i * vstride + sizeof(GrColor)) = innerCoverage; } else { *reinterpret_cast(verts + i * vstride) = scaledColor; } } // The innermost rect has 0 coverage verts += (outerVertexNum + innerVertexNum) * vstride; for (int i = 0; i < innerVertexNum; ++i) { if (kUseCoverage_CoverageAttribType == covAttribType) { *reinterpret_cast(verts + i * vstride) = color; *reinterpret_cast(verts + i * vstride + sizeof(GrColor)) = 0; } else { *reinterpret_cast(verts + i * vstride) = 0; } } target->setIndexSourceToBuffer(indexBuffer); target->drawIndexedInstances(drawState, kTriangles_GrPrimitiveType, 1, totalVertexNum, aa_stroke_rect_index_count(miterStroke)); target->resetIndexSource(); } void GrAARectRenderer::fillAANestedRects(GrDrawTarget* target, GrDrawState* drawState, const SkRect rects[2], const SkMatrix& combinedMatrix) { SkASSERT(combinedMatrix.rectStaysRect()); SkASSERT(!rects[1].isEmpty()); SkRect devOutside, devOutsideAssist, devInside; combinedMatrix.mapRect(&devOutside, rects[0]); // can't call mapRect for devInside since it calls sort combinedMatrix.mapPoints((SkPoint*)&devInside, (const SkPoint*)&rects[1], 2); if (devInside.isEmpty()) { this->fillAARect(target, drawState, devOutside, SkMatrix::I(), devOutside); return; } this->geometryStrokeAARect(target, drawState, devOutside, devOutsideAssist, devInside, true); }