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- /*
- * Copyright 2018 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/SkRefCnt.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkSize.h"
- #include "include/core/SkString.h"
- #include "include/core/SkTileMode.h"
- #include "include/core/SkTypes.h"
- #include "include/effects/SkGradientShader.h"
- // NOTE: The positions define hardstops for the red and green borders. For the repeating degenerate
- // gradients, that means the red and green are never visible, so the average color used should only
- // be based off of the white, blue, black blend.
- static const SkColor COLORS[] = { SK_ColorRED, SK_ColorWHITE, SK_ColorBLUE,
- SK_ColorBLACK, SK_ColorGREEN };
- static const SkScalar POS[] = { 0.0, 0.0, 0.5, 1.0, 1.0 };
- static const int COLOR_CT = SK_ARRAY_COUNT(COLORS);
- static const SkTileMode TILE_MODES[] = { SkTileMode::kDecal,
- SkTileMode::kRepeat,
- SkTileMode::kMirror,
- SkTileMode::kClamp };
- static const char* TILE_NAMES[] = { "decal", "repeat", "mirror", "clamp" };
- static const int TILE_MODE_CT = SK_ARRAY_COUNT(TILE_MODES);
- static constexpr int TILE_SIZE = 100;
- static constexpr int TILE_GAP = 10;
- static const SkPoint CENTER = SkPoint::Make(TILE_SIZE / 2, TILE_SIZE / 2);
- typedef sk_sp<SkShader> (*GradientFactory)(SkTileMode tm);
- static void draw_tile_header(SkCanvas* canvas) {
- canvas->save();
- for (int i = 0; i < TILE_MODE_CT; ++i) {
- canvas->drawString(TILE_NAMES[i], 0, 0, SkFont(), SkPaint());
- canvas->translate(TILE_SIZE + TILE_GAP, 0);
- }
- canvas->restore();
- // Now adjust to start at rows below the header
- canvas->translate(0, 2 * TILE_GAP);
- }
- static void draw_row(SkCanvas* canvas, const char* desc, GradientFactory factory) {
- canvas->save();
- SkPaint text;
- text.setAntiAlias(true);
- canvas->translate(0, TILE_GAP);
- canvas->drawString(desc, 0, 0, SkFont(), text);
- canvas->translate(0, TILE_GAP);
- SkPaint paint;
- paint.setColor(SK_ColorBLACK);
- paint.setStyle(SkPaint::kStrokeAndFill_Style);
- paint.setStrokeWidth(2.0f);
- for (int i = 0; i < TILE_MODE_CT; ++i) {
- paint.setShader(factory(TILE_MODES[i]));
- canvas->drawRect(SkRect::MakeWH(TILE_SIZE, TILE_SIZE), paint);
- canvas->translate(TILE_SIZE + TILE_GAP, 0);
- }
- canvas->restore();
- // Now adjust to start the next row below this one (1 gap for text and 2 gap for margin)
- canvas->translate(0, 3 * TILE_GAP + TILE_SIZE);
- }
- static sk_sp<SkShader> make_linear(SkTileMode mode) {
- // Same position
- SkPoint pts[2] = {CENTER, CENTER};
- return SkGradientShader::MakeLinear(pts, COLORS, POS, COLOR_CT, mode);
- }
- static sk_sp<SkShader> make_radial(SkTileMode mode) {
- // Radius = 0
- return SkGradientShader::MakeRadial(CENTER, 0.0, COLORS, POS, COLOR_CT, mode);
- }
- static sk_sp<SkShader> make_sweep(SkTileMode mode) {
- // Start and end angles at 45
- static constexpr SkScalar SWEEP_ANG = 45.0;
- return SkGradientShader::MakeSweep(CENTER.fX, CENTER.fY, COLORS, POS, COLOR_CT, mode,
- SWEEP_ANG, SWEEP_ANG, 0, nullptr);
- }
- static sk_sp<SkShader> make_sweep_zero_ang(SkTileMode mode) {
- // Start and end angles at 0
- return SkGradientShader::MakeSweep(CENTER.fX, CENTER.fY, COLORS, POS, COLOR_CT, mode,
- 0.0, 0.0, 0, nullptr);
- }
- static sk_sp<SkShader> make_2pt_conic(SkTileMode mode) {
- // Start and end radius = TILE_SIZE, same position
- return SkGradientShader::MakeTwoPointConical(CENTER, TILE_SIZE / 2, CENTER, TILE_SIZE / 2,
- COLORS, POS, COLOR_CT, mode);
- }
- static sk_sp<SkShader> make_2pt_conic_zero_rad(SkTileMode mode) {
- // Start and end radius = 0, same position
- return SkGradientShader::MakeTwoPointConical(CENTER, 0.0, CENTER, 0.0, COLORS, POS,
- COLOR_CT, mode);
- }
- class DegenerateGradientGM : public skiagm::GM {
- public:
- DegenerateGradientGM() {
- }
- protected:
- SkString onShortName() override {
- return SkString("degenerate_gradients");
- }
- SkISize onISize() override {
- return SkISize::Make(800, 800);
- }
- void onDraw(SkCanvas* canvas) override {
- canvas->translate(3 * TILE_GAP, 3 * TILE_GAP);
- draw_tile_header(canvas);
- draw_row(canvas, "linear: empty, blue, blue, green", make_linear);
- draw_row(canvas, "radial: empty, blue, blue, green", make_radial);
- draw_row(canvas, "sweep-0: empty, blue, blue, green", make_sweep_zero_ang);
- draw_row(canvas, "sweep-45: empty, blue, blue, red 45 degree sector then green",
- make_sweep);
- draw_row(canvas, "2pt-conic-0: empty, blue, blue, green", make_2pt_conic_zero_rad);
- draw_row(canvas, "2pt-conic-1: empty, blue, blue, full red circle on green",
- make_2pt_conic);
- }
- private:
- typedef skiagm::GM INHERITED;
- };
- DEF_GM(return new DegenerateGradientGM;)
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