| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkRecordOpts.h" |
| |
| #include "SkRecordPattern.h" |
| #include "SkRecords.h" |
| #include "SkTDArray.h" |
| |
| using namespace SkRecords; |
| |
| void SkRecordOptimize(SkRecord* record) { |
| // TODO(mtklein): fuse independent optimizations to reduce number of passes? |
| SkRecordNoopSaveRestores(record); |
| // TODO(mtklein): figure out why we draw differently and reenable |
| //SkRecordNoopSaveLayerDrawRestores(record); |
| |
| SkRecordReduceDrawPosTextStrength(record); // Helpful to run this before BoundDrawPosTextH. |
| } |
| |
| // Most of the optimizations in this file are pattern-based. These are all defined as structs with: |
| // - a Pattern typedef |
| // - a bool onMatch(SkRceord*, Pattern*, unsigned begin, unsigned end) method, |
| // which returns true if it made changes and false if not. |
| |
| // Run a pattern-based optimization once across the SkRecord, returning true if it made any changes. |
| // It looks for spans which match Pass::Pattern, and when found calls onMatch() with the pattern, |
| // record, and [begin,end) span of the commands that matched. |
| template <typename Pass> |
| static bool apply(Pass* pass, SkRecord* record) { |
| typename Pass::Pattern pattern; |
| bool changed = false; |
| unsigned begin, end = 0; |
| |
| while (pattern.search(record, &begin, &end)) { |
| changed |= pass->onMatch(record, &pattern, begin, end); |
| } |
| return changed; |
| } |
| |
| // Turns the logical NoOp Save and Restore in Save-Draw*-Restore patterns into actual NoOps. |
| struct SaveOnlyDrawsRestoreNooper { |
| typedef Pattern3<Is<Save>, |
| Star<Or<Is<NoOp>, IsDraw> >, |
| Is<Restore> > |
| Pattern; |
| |
| bool onMatch(SkRecord* record, Pattern* pattern, unsigned begin, unsigned end) { |
| record->replace<NoOp>(begin); // Save |
| record->replace<NoOp>(end-1); // Restore |
| return true; |
| } |
| }; |
| // Turns logical no-op Save-[non-drawing command]*-Restore patterns into actual no-ops. |
| struct SaveNoDrawsRestoreNooper { |
| // Star matches greedily, so we also have to exclude Save and Restore. |
| typedef Pattern3<Is<Save>, |
| Star<Not<Or3<Is<Save>, |
| Is<Restore>, |
| IsDraw> > >, |
| Is<Restore> > |
| Pattern; |
| |
| bool onMatch(SkRecord* record, Pattern* pattern, unsigned begin, unsigned end) { |
| // The entire span between Save and Restore (inclusively) does nothing. |
| for (unsigned i = begin; i < end; i++) { |
| record->replace<NoOp>(i); |
| } |
| return true; |
| } |
| }; |
| void SkRecordNoopSaveRestores(SkRecord* record) { |
| SaveOnlyDrawsRestoreNooper onlyDraws; |
| SaveNoDrawsRestoreNooper noDraws; |
| |
| // Run until they stop changing things. |
| while (apply(&onlyDraws, record) || apply(&noDraws, record)); |
| } |
| |
| // For some SaveLayer-[drawing command]-Restore patterns, merge the SaveLayer's alpha into the |
| // draw, and no-op the SaveLayer and Restore. |
| struct SaveLayerDrawRestoreNooper { |
| typedef Pattern3<Is<SaveLayer>, IsDraw, Is<Restore> > Pattern; |
| |
| bool onMatch(SkRecord* record, Pattern* pattern, unsigned begin, unsigned end) { |
| SaveLayer* saveLayer = pattern->first<SaveLayer>(); |
| if (saveLayer->bounds != NULL) { |
| // SaveLayer with bounds is too tricky for us. |
| return false; |
| } |
| |
| SkPaint* layerPaint = saveLayer->paint; |
| if (NULL == layerPaint) { |
| // There wasn't really any point to this SaveLayer at all. |
| return KillSaveLayerAndRestore(record, begin); |
| } |
| |
| SkPaint* drawPaint = pattern->second<SkPaint>(); |
| if (drawPaint == NULL) { |
| // We can just give the draw the SaveLayer's paint. |
| // TODO(mtklein): figure out how to do this clearly |
| return false; |
| } |
| |
| const uint32_t layerColor = layerPaint->getColor(); |
| const uint32_t drawColor = drawPaint->getColor(); |
| if (!IsOnlyAlpha(layerColor) || !IsOpaque(drawColor) || |
| HasAnyEffect(*layerPaint) || HasAnyEffect(*drawPaint)) { |
| // Too fancy for us. Actually, as long as layerColor is just an alpha |
| // we can blend it into drawColor's alpha; drawColor doesn't strictly have to be opaque. |
| return false; |
| } |
| |
| drawPaint->setColor(SkColorSetA(drawColor, SkColorGetA(layerColor))); |
| return KillSaveLayerAndRestore(record, begin); |
| } |
| |
| static bool KillSaveLayerAndRestore(SkRecord* record, unsigned saveLayerIndex) { |
| record->replace<NoOp>(saveLayerIndex); // SaveLayer |
| record->replace<NoOp>(saveLayerIndex+2); // Restore |
| return true; |
| } |
| |
| static bool HasAnyEffect(const SkPaint& paint) { |
| return paint.getPathEffect() || |
| paint.getShader() || |
| paint.getXfermode() || |
| paint.getMaskFilter() || |
| paint.getColorFilter() || |
| paint.getRasterizer() || |
| paint.getLooper() || |
| paint.getImageFilter(); |
| } |
| |
| static bool IsOpaque(SkColor color) { |
| return SkColorGetA(color) == SK_AlphaOPAQUE; |
| } |
| static bool IsOnlyAlpha(SkColor color) { |
| return SK_ColorTRANSPARENT == SkColorSetA(color, SK_AlphaTRANSPARENT); |
| } |
| }; |
| void SkRecordNoopSaveLayerDrawRestores(SkRecord* record) { |
| SaveLayerDrawRestoreNooper pass; |
| apply(&pass, record); |
| } |
| |
| |
| // Replaces DrawPosText with DrawPosTextH when all Y coordinates are equal. |
| struct StrengthReducer { |
| typedef Pattern1<Is<DrawPosText> > Pattern; |
| |
| bool onMatch(SkRecord* record, Pattern* pattern, unsigned begin, unsigned end) { |
| SkASSERT(end == begin + 1); |
| DrawPosText* draw = pattern->first<DrawPosText>(); |
| |
| const unsigned points = draw->paint.countText(draw->text, draw->byteLength); |
| if (points == 0) { |
| return false; // No point (ha!). |
| } |
| |
| const SkScalar firstY = draw->pos[0].fY; |
| for (unsigned i = 1; i < points; i++) { |
| if (draw->pos[i].fY != firstY) { |
| return false; // Needs full power of DrawPosText. |
| } |
| } |
| // All ys are the same. We can replace DrawPosText with DrawPosTextH. |
| |
| // draw->pos is points SkPoints, [(x,y),(x,y),(x,y),(x,y), ... ]. |
| // We're going to squint and look at that as 2*points SkScalars, [x,y,x,y,x,y,x,y, ...]. |
| // Then we'll rearrange things so all the xs are in order up front, clobbering the ys. |
| SK_COMPILE_ASSERT(sizeof(SkPoint) == 2 * sizeof(SkScalar), SquintingIsNotSafe); |
| SkScalar* scalars = &draw->pos[0].fX; |
| for (unsigned i = 0; i < 2*points; i += 2) { |
| scalars[i/2] = scalars[i]; |
| } |
| |
| // Extend lifetime of draw to the end of the loop so we can copy its paint. |
| Adopted<DrawPosText> adopted(draw); |
| SkNEW_PLACEMENT_ARGS(record->replace<DrawPosTextH>(begin, adopted), |
| DrawPosTextH, |
| (draw->paint, draw->text, draw->byteLength, scalars, firstY)); |
| return true; |
| } |
| }; |
| void SkRecordReduceDrawPosTextStrength(SkRecord* record) { |
| StrengthReducer pass; |
| apply(&pass, record); |
| } |
| |