| /* |
| * 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 "gm/gm.h" |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPathBuilder.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTypeface.h" |
| #include "include/core/SkTypes.h" |
| #include "include/utils/SkTextUtils.h" |
| #include "tools/ToolUtils.h" |
| |
| enum { |
| kXfermodeCount = (int)SkBlendMode::kLastMode + 1 + 1, // extra for arith |
| kShapeSize = 22, |
| kShapeSpacing = 36, |
| kShapeTypeSpacing = 4 * kShapeSpacing / 3, |
| kPaintSpacing = 4 * kShapeTypeSpacing, |
| kLabelSpacing = 3 * kShapeSize, |
| kMargin = kShapeSpacing / 2, |
| kXfermodeTypeSpacing = kLabelSpacing + 2 * kPaintSpacing + kShapeTypeSpacing, |
| kTitleSpacing = 3 * kShapeSpacing / 4, |
| kSubtitleSpacing = 5 * kShapeSpacing / 8 |
| }; |
| |
| constexpr SkColor kBGColor = 0xc8d2b887; |
| |
| constexpr SkColor kShapeColors[2] = { |
| 0x82ff0080, // input color unknown |
| 0xff00ffff, // input color opaque |
| }; |
| |
| enum Shape { |
| kSquare_Shape, |
| kDiamond_Shape, |
| kOval_Shape, |
| kConcave_Shape, |
| |
| kLast_Shape = kConcave_Shape |
| }; |
| |
| /** |
| * Verifies AA works properly on all Xfermodes, including arithmetic, with both opaque and unknown |
| * src colors. |
| */ |
| class AAXfermodesGM : public skiagm::GM { |
| public: |
| AAXfermodesGM() {} |
| |
| protected: |
| enum DrawingPass { |
| kCheckerboard_Pass, |
| kBackground_Pass, |
| kShape_Pass |
| }; |
| |
| SkString onShortName() override { |
| return SkString("aaxfermodes"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(2 * kMargin + 2 * kXfermodeTypeSpacing - |
| (kXfermodeTypeSpacing - (kLabelSpacing + 2 * kPaintSpacing)), |
| 2 * kMargin + kTitleSpacing + kSubtitleSpacing + |
| (1 + (int)SkBlendMode::kLastCoeffMode) * kShapeSpacing); |
| } |
| |
| void onOnceBeforeDraw() override { |
| fLabelFont.setTypeface(ToolUtils::create_portable_typeface()); |
| fLabelFont.setSize(5 * kShapeSize/8); |
| fLabelFont.setSubpixel(true); |
| |
| constexpr SkScalar radius = -1.4f * kShapeSize/2; |
| SkPoint pts[4] = { |
| {-radius, 0}, |
| {0, -1.33f * radius}, |
| {radius, 0}, |
| {0, 1.33f * radius} |
| }; |
| fOval = SkPathBuilder().moveTo(pts[0]) |
| .quadTo(pts[1], pts[2]) |
| .quadTo(pts[3], pts[0]) |
| .detach(); |
| |
| fConcave = SkPathBuilder().moveTo(-radius, 0) |
| .quadTo(0, 0, 0, -radius) |
| .quadTo(0, 0, radius, 0) |
| .quadTo(0, 0, 0, radius) |
| .quadTo(0, 0, -radius, 0) |
| .close() |
| .detach(); |
| } |
| |
| void draw_pass(SkCanvas* canvas, DrawingPass drawingPass) { |
| SkRect clipRect = |
| { -kShapeSize*11/16, -kShapeSize*11/16, kShapeSize*11/16, kShapeSize*11/16 }; |
| |
| canvas->save(); |
| if (kCheckerboard_Pass == drawingPass) { |
| canvas->translate(kMargin, kMargin); |
| } |
| canvas->translate(0, kTitleSpacing); |
| |
| for (size_t xfermodeSet = 0; xfermodeSet < 2; xfermodeSet++) { |
| size_t firstMode = ((size_t)SkBlendMode::kLastCoeffMode + 1) * xfermodeSet; |
| canvas->save(); |
| |
| if (kShape_Pass == drawingPass) { |
| SkTextUtils::DrawString(canvas, "Src Unknown", |
| kLabelSpacing + kShapeTypeSpacing * 1.5f + kShapeSpacing / 2, |
| kSubtitleSpacing / 2 + fLabelFont.getSize() / 3, fLabelFont, SkPaint(), |
| SkTextUtils::kCenter_Align); |
| SkTextUtils::DrawString(canvas, "Src Opaque", |
| kLabelSpacing + kShapeTypeSpacing * 1.5f + kShapeSpacing / 2 + |
| kPaintSpacing, kSubtitleSpacing / 2 + fLabelFont.getSize() / 3, |
| fLabelFont, SkPaint(), SkTextUtils::kCenter_Align); |
| } |
| |
| canvas->translate(0, kSubtitleSpacing + kShapeSpacing/2); |
| |
| for (size_t m = 0; m <= (size_t)SkBlendMode::kLastCoeffMode; m++) { |
| if (firstMode + m > (size_t)SkBlendMode::kLastMode) { |
| break; |
| } |
| SkBlendMode mode = static_cast<SkBlendMode>(firstMode + m); |
| canvas->save(); |
| |
| if (kShape_Pass == drawingPass) { |
| this->drawModeName(canvas, mode); |
| } |
| canvas->translate(kLabelSpacing + kShapeSpacing/2, 0); |
| |
| for (size_t colorIdx = 0; colorIdx < std::size(kShapeColors); colorIdx++) { |
| SkPaint paint; |
| this->setupShapePaint(canvas, kShapeColors[colorIdx], mode, &paint); |
| SkASSERT(colorIdx == 0 || 255 == paint.getAlpha()); |
| canvas->save(); |
| |
| for (size_t shapeIdx = 0; shapeIdx <= kLast_Shape; shapeIdx++) { |
| if (kShape_Pass != drawingPass) { |
| canvas->save(); |
| canvas->clipRect(clipRect); |
| if (kCheckerboard_Pass == drawingPass) { |
| ToolUtils::draw_checkerboard(canvas, 0xffffffff, 0xffc6c3c6, 10); |
| } else { |
| SkASSERT(kBackground_Pass == drawingPass); |
| canvas->drawColor(kBGColor, SkBlendMode::kSrc); |
| } |
| canvas->restore(); |
| } else { |
| this->drawShape(canvas, static_cast<Shape>(shapeIdx), paint, mode); |
| } |
| canvas->translate(kShapeTypeSpacing, 0); |
| } |
| |
| canvas->restore(); |
| canvas->translate(kPaintSpacing, 0); |
| } |
| |
| canvas->restore(); |
| canvas->translate(0, kShapeSpacing); |
| } |
| |
| canvas->restore(); |
| canvas->translate(kXfermodeTypeSpacing, 0); |
| } |
| |
| canvas->restore(); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| draw_pass(canvas, kCheckerboard_Pass); |
| canvas->saveLayer(nullptr, nullptr); |
| |
| canvas->translate(kMargin, kMargin); |
| draw_pass(canvas, kBackground_Pass); |
| |
| SkFont titleFont(fLabelFont); |
| titleFont.setSize(9 * titleFont.getSize() / 8); |
| titleFont.setEmbolden(true); |
| SkTextUtils::DrawString(canvas, "Porter Duff", |
| kLabelSpacing + 4 * kShapeTypeSpacing, |
| kTitleSpacing / 2 + titleFont.getSize() / 3, titleFont, SkPaint(), |
| SkTextUtils::kCenter_Align); |
| SkTextUtils::DrawString(canvas, "Advanced", |
| kXfermodeTypeSpacing + kLabelSpacing + 4 * kShapeTypeSpacing, |
| kTitleSpacing / 2 + titleFont.getSize() / 3, titleFont, SkPaint(), |
| SkTextUtils::kCenter_Align); |
| |
| draw_pass(canvas, kShape_Pass); |
| canvas->restore(); |
| } |
| |
| void drawModeName(SkCanvas* canvas, SkBlendMode mode) { |
| const char* modeName = SkBlendMode_Name(mode); |
| SkTextUtils::DrawString(canvas, modeName, kLabelSpacing - kShapeSize / 4, |
| fLabelFont.getSize() / 4, fLabelFont, SkPaint(), |
| SkTextUtils::kRight_Align); |
| } |
| |
| void setupShapePaint(SkCanvas* canvas, SkColor color, SkBlendMode mode, SkPaint* paint) { |
| paint->setColor(color); |
| |
| if (mode == SkBlendMode::kPlus) { |
| // Check for overflow, otherwise we might get confusing AA artifacts. |
| int maxSum = std::max(std::max(SkColorGetA(kBGColor) + SkColorGetA(color), |
| SkColorGetR(kBGColor) + SkColorGetR(color)), |
| std::max(SkColorGetG(kBGColor) + SkColorGetG(color), |
| SkColorGetB(kBGColor) + SkColorGetB(color))); |
| |
| if (maxSum > 255) { |
| SkPaint dimPaint; |
| dimPaint.setAntiAlias(false); |
| dimPaint.setBlendMode(SkBlendMode::kDstIn); |
| if (255 != paint->getAlpha()) { |
| // Dim the src and dst colors. |
| dimPaint.setARGB(255 * 255 / maxSum, 0, 0, 0); |
| paint->setAlpha(255 * paint->getAlpha() / maxSum); |
| } else { |
| // Just clear the dst, we need to preserve the paint's opacity. |
| dimPaint.setARGB(0, 0, 0, 0); |
| } |
| canvas->drawRect({ -kShapeSpacing/2, -kShapeSpacing/2, |
| kShapeSpacing/2 + 3 * kShapeTypeSpacing, kShapeSpacing/2 }, |
| dimPaint); |
| } |
| } |
| } |
| |
| void drawShape(SkCanvas* canvas, Shape shape, const SkPaint& paint, SkBlendMode mode) { |
| SkASSERT(mode <= SkBlendMode::kLastMode); |
| SkPaint shapePaint(paint); |
| shapePaint.setAntiAlias(kSquare_Shape != shape); |
| shapePaint.setBlendMode(mode); |
| |
| switch (shape) { |
| case kSquare_Shape: |
| canvas->drawRect({ -kShapeSize/2, -kShapeSize/2, kShapeSize/2, kShapeSize/2 }, |
| shapePaint); |
| break; |
| |
| case kDiamond_Shape: |
| canvas->save(); |
| canvas->rotate(45); |
| canvas->drawRect({ -kShapeSize/2, -kShapeSize/2, kShapeSize/2, kShapeSize/2 }, |
| shapePaint); |
| canvas->restore(); |
| break; |
| |
| case kOval_Shape: |
| canvas->save(); |
| canvas->rotate(static_cast<SkScalar>((511 * (int)mode + 257) % 360)); |
| canvas->drawPath(fOval, shapePaint); |
| canvas->restore(); |
| break; |
| |
| case kConcave_Shape: |
| canvas->drawPath(fConcave, shapePaint); |
| break; |
| |
| default: |
| SK_ABORT("Invalid shape."); |
| } |
| } |
| |
| private: |
| SkFont fLabelFont; |
| SkPath fOval; |
| SkPath fConcave; |
| |
| using INHERITED = skiagm::GM; |
| }; |
| DEF_GM( return new AAXfermodesGM; ) |