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- /*
- * 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/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkFont.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPoint.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkSize.h"
- #include "include/core/SkString.h"
- #include "include/core/SkTypeface.h"
- #include "include/core/SkTypes.h"
- #include "tools/ToolUtils.h"
- // This class of GMs test how edges/verts snap near rounding boundaries in device space without
- // anti-aliaing.
- class PixelSnapGM : public skiagm::GM {
- public:
- PixelSnapGM() {}
- protected:
- // kTrans should be even or checkboards wont agree in different test cases.
- static constexpr int kTrans = 14;
- static constexpr int kLabelPad = 4;
- // The inverse of this value should be a perfect SkScalar.
- static constexpr int kSubPixelSteps = 8;
- static constexpr int kLabelTextSize = 9;
- static_assert(kSubPixelSteps < 99, "label_offset_too_small");
- static constexpr int kLabelOffsetX = 2 * kLabelTextSize + kLabelPad;
- static constexpr int kLabelOffsetY = kLabelTextSize + kLabelPad;
- SkISize onISize() override {
- return SkISize::Make((kSubPixelSteps + 1) * kTrans + kLabelOffsetX + kLabelPad,
- (kSubPixelSteps + 1) * kTrans + kLabelOffsetY + kLabelPad);
- }
- void onDraw(SkCanvas* canvas) override {
- SkPaint bgPaint;
- bgPaint.setShader(ToolUtils::create_checkerboard_shader(0xFFAAAAAA, 0xFF777777, 1));
- canvas->drawPaint(bgPaint);
- SkString offset;
- SkPaint labelPaint;
- labelPaint.setColor(SK_ColorWHITE);
- SkFont font(ToolUtils::create_portable_typeface(), SkIntToScalar(kLabelTextSize));
- SkPaint linePaint;
- linePaint.setColor(SK_ColorWHITE);
- // Draw row labels
- canvas->save();
- canvas->translate(0, SkIntToScalar(kLabelOffsetY));
- for (int i = 0; i <= kSubPixelSteps; ++i) {
- offset.printf("%d", i);
- canvas->drawString(offset, 0, i * kTrans + SkIntToScalar(kLabelTextSize),
- font, labelPaint);
- }
- canvas->restore();
- // Draw col labels
- canvas->save();
- canvas->translate(SkIntToScalar(kLabelOffsetX), 0);
- for (int i = 0; i <= kSubPixelSteps; ++i) {
- offset.printf("%d", i);
- canvas->drawString(offset, i * SkIntToScalar(kTrans), SkIntToScalar(kLabelTextSize),
- font, labelPaint);
- }
- canvas->restore();
- canvas->translate(SkIntToScalar(kLabelOffsetX), SkIntToScalar(kLabelOffsetY));
- // Draw test case grid lines (Draw them all at pixel centers to hopefully avoid any
- // snapping issues).
- for (int i = 0; i <= kSubPixelSteps + 1; ++i) {
- canvas->drawLine(0.5f,
- i * SkIntToScalar(kTrans) + 0.5f,
- SkIntToScalar(kTrans) * (kSubPixelSteps + 1) + 0.5f,
- i * SkIntToScalar(kTrans) + 0.5f,
- linePaint);
- canvas->drawLine(i * SkIntToScalar(kTrans) + 0.5f,
- 0.5f,
- i * SkIntToScalar(kTrans) + 0.5f,
- SkIntToScalar(kTrans) * (kSubPixelSteps + 1) + 0.5f,
- linePaint);
- }
- for (int i = 0; i <= kSubPixelSteps; ++i) {
- for (int j = 0; j <= kSubPixelSteps; ++j) {
- canvas->save();
- // +1's account for the grid lines around each test case.
- canvas->translate(j * (kTrans + 1.f/kSubPixelSteps) + 1,
- i * (kTrans + 1.f/kSubPixelSteps) + 1);
- this->drawElement(canvas);
- canvas->restore();
- }
- }
- }
- virtual void drawElement(SkCanvas*) = 0;
- private:
- typedef skiagm::GM INHERITED;
- };
- class PointSnapGM : public PixelSnapGM {
- protected:
- SkString onShortName() override { return SkString("pixel_snap_point"); }
- void drawElement(SkCanvas* canvas) override {
- const SkPoint pt = { 1, 1 };
- SkPaint paint;
- paint.setColor(SK_ColorBLUE);
- canvas->drawPoints(SkCanvas::kPoints_PointMode, 1, &pt, paint);
- }
- private:
- typedef PixelSnapGM INHERITED;
- };
- class LineSnapGM : public PixelSnapGM {
- protected:
- SkString onShortName() override { return SkString("pixel_snap_line"); }
- void drawElement(SkCanvas* canvas) override {
- SkPaint paint;
- paint.setColor(SK_ColorGREEN);
- // Draw a horizontal and vertical line, each length 3.
- canvas->drawLine(1, 1, 4, 1, paint);
- canvas->drawLine(6, 1, 6, 4, paint);
- }
- private:
- typedef PixelSnapGM INHERITED;
- };
- class RectSnapGM : public PixelSnapGM {
- protected:
- SkString onShortName() override { return SkString("pixel_snap_rect"); }
- void drawElement(SkCanvas* canvas) override {
- SkPaint paint;
- paint.setColor(SK_ColorRED);
- canvas->drawRect(SkRect::MakeXYWH(1, 1, 3, 3), paint);
- }
- private:
- typedef PixelSnapGM INHERITED;
- };
- class ComboSnapGM : public PixelSnapGM {
- protected:
- SkString onShortName() override { return SkString("pixel_snap_combo"); }
- void drawElement(SkCanvas* canvas) override {
- SkPaint paint;
- paint.setAntiAlias(false);
- // A rectangle that exactly covers a pixel, a point at each corner, 8 horiz/vert lines
- // at rect corners (two at each corner, extending away from rect). They are drawn in this
- // order lines (green), points (blue), rect(red).
- SkRect rect = SkRect::MakeXYWH(3, 3, 1, 1);
- paint.setColor(SK_ColorGREEN);
- const SkPoint lines[] = {
- { 3, 3 }, { 0, 3 },
- { 3, 3 }, { 3, 0 },
- { 4, 3 }, { 7, 3 },
- { 4, 3 }, { 4, 0 },
- { 3, 4 }, { 0, 4 },
- { 3, 4 }, { 3, 7 },
- { 4, 4 }, { 7, 4 },
- { 4, 4 }, { 4, 7 },
- };
- canvas->drawPoints(SkCanvas::kLines_PointMode, SK_ARRAY_COUNT(lines), lines, paint);
- const SkPoint pts[] = {
- { 4, 3 }, { 4, 4, }, { 3, 3 }, { 3, 4 },
- };
- paint.setColor(SK_ColorBLUE);
- canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(pts), pts, paint);
- paint.setColor(SK_ColorRED);
- canvas->drawRect(rect, paint);
- }
- private:
- typedef PixelSnapGM INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_GM(return new PointSnapGM;)
- DEF_GM(return new LineSnapGM;)
- DEF_GM(return new RectSnapGM;)
- DEF_GM(return new ComboSnapGM;)
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