| /* | |
| * Copyright 2015 Google Inc. | |
| * | |
| * Use of this source code is governed by a BSD-style license that can be | |
| * found in the LICENSE file. | |
| */ | |
| #include "GrBlurUtils.h" | |
| #include "GrDrawContext.h" | |
| #include "GrCaps.h" | |
| #include "GrContext.h" | |
| #include "effects/GrSimpleTextureEffect.h" | |
| #include "GrStrokeInfo.h" | |
| #include "GrTexture.h" | |
| #include "GrTextureProvider.h" | |
| #include "SkDraw.h" | |
| #include "SkGr.h" | |
| #include "SkMaskFilter.h" | |
| #include "SkPaint.h" | |
| static bool clip_bounds_quick_reject(const SkIRect& clipBounds, const SkIRect& rect) { | |
| return clipBounds.isEmpty() || rect.isEmpty() || !SkIRect::Intersects(clipBounds, rect); | |
| } | |
| // Draw a mask using the supplied paint. Since the coverage/geometry | |
| // is already burnt into the mask this boils down to a rect draw. | |
| // Return true if the mask was successfully drawn. | |
| static bool draw_mask(GrDrawContext* drawContext, | |
| GrRenderTarget* rt, | |
| const GrClip& clip, | |
| const SkMatrix& viewMatrix, | |
| const SkRect& maskRect, | |
| GrPaint* grp, | |
| GrTexture* mask) { | |
| SkMatrix matrix; | |
| matrix.setTranslate(-maskRect.fLeft, -maskRect.fTop); | |
| matrix.postIDiv(mask->width(), mask->height()); | |
| grp->addCoverageProcessor(GrSimpleTextureEffect::Create(mask, matrix, | |
| kDevice_GrCoordSet))->unref(); | |
| SkMatrix inverse; | |
| if (!viewMatrix.invert(&inverse)) { | |
| return false; | |
| } | |
| drawContext->drawNonAARectWithLocalMatrix(rt, clip, *grp, SkMatrix::I(), maskRect, inverse); | |
| return true; | |
| } | |
| static bool draw_with_mask_filter(GrDrawContext* drawContext, | |
| GrTextureProvider* textureProvider, | |
| GrRenderTarget* rt, | |
| const GrClip& clipData, | |
| const SkMatrix& viewMatrix, | |
| const SkPath& devPath, | |
| SkMaskFilter* filter, | |
| const SkIRect& clipBounds, | |
| GrPaint* grp, | |
| SkPaint::Style style) { | |
| SkMask srcM, dstM; | |
| if (!SkDraw::DrawToMask(devPath, &clipBounds, filter, &viewMatrix, &srcM, | |
| SkMask::kComputeBoundsAndRenderImage_CreateMode, style)) { | |
| return false; | |
| } | |
| SkAutoMaskFreeImage autoSrc(srcM.fImage); | |
| if (!filter->filterMask(&dstM, srcM, viewMatrix, NULL)) { | |
| return false; | |
| } | |
| // this will free-up dstM when we're done (allocated in filterMask()) | |
| SkAutoMaskFreeImage autoDst(dstM.fImage); | |
| if (clip_bounds_quick_reject(clipBounds, dstM.fBounds)) { | |
| return false; | |
| } | |
| // we now have a device-aligned 8bit mask in dstM, ready to be drawn using | |
| // the current clip (and identity matrix) and GrPaint settings | |
| GrSurfaceDesc desc; | |
| desc.fWidth = dstM.fBounds.width(); | |
| desc.fHeight = dstM.fBounds.height(); | |
| desc.fConfig = kAlpha_8_GrPixelConfig; | |
| SkAutoTUnref<GrTexture> texture(textureProvider->refScratchTexture( | |
| desc, GrTextureProvider::kApprox_ScratchTexMatch)); | |
| if (!texture) { | |
| return false; | |
| } | |
| texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, | |
| dstM.fImage, dstM.fRowBytes); | |
| SkRect maskRect = SkRect::Make(dstM.fBounds); | |
| return draw_mask(drawContext, rt, clipData, viewMatrix, maskRect, grp, texture); | |
| } | |
| // Create a mask of 'devPath' and place the result in 'mask'. | |
| static GrTexture* create_mask_GPU(GrContext* context, | |
| const SkRect& maskRect, | |
| const SkPath& devPath, | |
| const GrStrokeInfo& strokeInfo, | |
| bool doAA, | |
| int sampleCnt) { | |
| GrSurfaceDesc desc; | |
| desc.fFlags = kRenderTarget_GrSurfaceFlag; | |
| desc.fWidth = SkScalarCeilToInt(maskRect.width()); | |
| desc.fHeight = SkScalarCeilToInt(maskRect.height()); | |
| desc.fSampleCnt = doAA ? sampleCnt : 0; | |
| // We actually only need A8, but it often isn't supported as a | |
| // render target so default to RGBA_8888 | |
| desc.fConfig = kRGBA_8888_GrPixelConfig; | |
| if (context->caps()->isConfigRenderable(kAlpha_8_GrPixelConfig, desc.fSampleCnt > 0)) { | |
| desc.fConfig = kAlpha_8_GrPixelConfig; | |
| } | |
| GrTexture* mask = context->textureProvider()->refScratchTexture( | |
| desc, GrTextureProvider::kApprox_ScratchTexMatch); | |
| if (NULL == mask) { | |
| return NULL; | |
| } | |
| SkRect clipRect = SkRect::MakeWH(maskRect.width(), maskRect.height()); | |
| GrDrawContext* drawContext = context->drawContext(); | |
| if (!drawContext) { | |
| return NULL; | |
| } | |
| drawContext->clear(mask->asRenderTarget(), NULL, 0x0, true); | |
| GrPaint tempPaint; | |
| tempPaint.setAntiAlias(doAA); | |
| tempPaint.setCoverageSetOpXPFactory(SkRegion::kReplace_Op); | |
| // setup new clip | |
| GrClip clip(clipRect); | |
| // Draw the mask into maskTexture with the path's top-left at the origin using tempPaint. | |
| SkMatrix translate; | |
| translate.setTranslate(-maskRect.fLeft, -maskRect.fTop); | |
| drawContext->drawPath(mask->asRenderTarget(), clip, tempPaint, translate, devPath, strokeInfo); | |
| return mask; | |
| } | |
| void GrBlurUtils::drawPathWithMaskFilter(GrContext* context, | |
| GrDrawContext* drawContext, | |
| GrRenderTarget* renderTarget, | |
| const GrClip& clip, | |
| const SkPath& origSrcPath, | |
| const SkPaint& paint, | |
| const SkMatrix& origViewMatrix, | |
| const SkMatrix* prePathMatrix, | |
| const SkIRect& clipBounds, | |
| bool pathIsMutable) { | |
| SkASSERT(!pathIsMutable || origSrcPath.isVolatile()); | |
| GrStrokeInfo strokeInfo(paint); | |
| // If we have a prematrix, apply it to the path, optimizing for the case | |
| // where the original path can in fact be modified in place (even though | |
| // its parameter type is const). | |
| SkPath* pathPtr = const_cast<SkPath*>(&origSrcPath); | |
| SkTLazy<SkPath> tmpPath; | |
| SkTLazy<SkPath> effectPath; | |
| SkPathEffect* pathEffect = paint.getPathEffect(); | |
| SkMatrix viewMatrix = origViewMatrix; | |
| if (prePathMatrix) { | |
| // stroking, path effects, and blurs are supposed to be applied *after* the prePathMatrix. | |
| // The pre-path-matrix also should not affect shading. | |
| if (NULL == paint.getMaskFilter() && NULL == pathEffect && NULL == paint.getShader() && | |
| (strokeInfo.isFillStyle() || strokeInfo.isHairlineStyle())) { | |
| viewMatrix.preConcat(*prePathMatrix); | |
| } else { | |
| SkPath* result = pathPtr; | |
| if (!pathIsMutable) { | |
| result = tmpPath.init(); | |
| result->setIsVolatile(true); | |
| pathIsMutable = true; | |
| } | |
| // should I push prePathMatrix on our MV stack temporarily, instead | |
| // of applying it here? See SkDraw.cpp | |
| pathPtr->transform(*prePathMatrix, result); | |
| pathPtr = result; | |
| } | |
| } | |
| // at this point we're done with prePathMatrix | |
| SkDEBUGCODE(prePathMatrix = (const SkMatrix*)0x50FF8001;) | |
| GrPaint grPaint; | |
| if (!SkPaint2GrPaint(context, renderTarget, paint, viewMatrix, true, &grPaint)) { | |
| return; | |
| } | |
| const SkRect* cullRect = NULL; // TODO: what is our bounds? | |
| if (!strokeInfo.isDashed() && pathEffect && pathEffect->filterPath(effectPath.init(), *pathPtr, | |
| &strokeInfo, cullRect)) { | |
| pathPtr = effectPath.get(); | |
| pathIsMutable = true; | |
| } | |
| if (paint.getMaskFilter()) { | |
| if (!strokeInfo.isHairlineStyle()) { | |
| SkPath* strokedPath = pathIsMutable ? pathPtr : tmpPath.init(); | |
| if (strokeInfo.isDashed()) { | |
| if (pathEffect->filterPath(strokedPath, *pathPtr, &strokeInfo, cullRect)) { | |
| pathPtr = strokedPath; | |
| pathIsMutable = true; | |
| } | |
| strokeInfo.removeDash(); | |
| } | |
| if (strokeInfo.applyToPath(strokedPath, *pathPtr)) { | |
| pathPtr = strokedPath; | |
| pathIsMutable = true; | |
| strokeInfo.setFillStyle(); | |
| } | |
| } | |
| // avoid possibly allocating a new path in transform if we can | |
| SkPath* devPathPtr = pathIsMutable ? pathPtr : tmpPath.init(); | |
| if (!pathIsMutable) { | |
| devPathPtr->setIsVolatile(true); | |
| } | |
| // transform the path into device space | |
| pathPtr->transform(viewMatrix, devPathPtr); | |
| SkRect maskRect; | |
| if (paint.getMaskFilter()->canFilterMaskGPU(devPathPtr->getBounds(), | |
| clipBounds, | |
| viewMatrix, | |
| &maskRect)) { | |
| SkIRect finalIRect; | |
| maskRect.roundOut(&finalIRect); | |
| if (clip_bounds_quick_reject(clipBounds, finalIRect)) { | |
| // clipped out | |
| return; | |
| } | |
| if (paint.getMaskFilter()->directFilterMaskGPU(context, | |
| renderTarget, | |
| &grPaint, | |
| clip, | |
| viewMatrix, | |
| strokeInfo, | |
| *devPathPtr)) { | |
| // the mask filter was able to draw itself directly, so there's nothing | |
| // left to do. | |
| return; | |
| } | |
| SkAutoTUnref<GrTexture> mask(create_mask_GPU(context, | |
| maskRect, | |
| *devPathPtr, | |
| strokeInfo, | |
| grPaint.isAntiAlias(), | |
| renderTarget->numSamples())); | |
| if (mask) { | |
| GrTexture* filtered; | |
| if (paint.getMaskFilter()->filterMaskGPU(mask, viewMatrix, maskRect, | |
| &filtered, true)) { | |
| // filterMaskGPU gives us ownership of a ref to the result | |
| SkAutoTUnref<GrTexture> atu(filtered); | |
| if (draw_mask(drawContext, | |
| renderTarget, | |
| clip, | |
| viewMatrix, | |
| maskRect, | |
| &grPaint, | |
| filtered)) { | |
| // This path is completely drawn | |
| return; | |
| } | |
| } | |
| } | |
| } | |
| // draw the mask on the CPU - this is a fallthrough path in case the | |
| // GPU path fails | |
| SkPaint::Style style = strokeInfo.isHairlineStyle() ? SkPaint::kStroke_Style : | |
| SkPaint::kFill_Style; | |
| draw_with_mask_filter(drawContext, context->textureProvider(), renderTarget, | |
| clip, viewMatrix, *devPathPtr, | |
| paint.getMaskFilter(), clipBounds, &grPaint, style); | |
| return; | |
| } | |
| drawContext->drawPath(renderTarget, clip, grPaint, viewMatrix, *pathPtr, strokeInfo); | |
| } | |