diff options
author | fmenozzi <fmenozzi@google.com> | 2016-06-22 13:39:25 -0700 |
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committer | Commit bot <commit-bot@chromium.org> | 2016-06-22 13:39:25 -0700 |
commit | 17b64b2fd4df538ec952b128a07dbf6ae0afe990 (patch) | |
tree | 4bee7ddf564df4af27290c7b8f67487be67b56bd | |
parent | 1afb8f8965b0549525c1ad8d8baa885ccdb48f6d (diff) |
Add GM for hard stop gradients
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2087273002
Review-Url: https://codereview.chromium.org/2087273002
-rw-r--r-- | gm/hardstop_gradients.cpp | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/gm/hardstop_gradients.cpp b/gm/hardstop_gradients.cpp new file mode 100644 index 0000000000..c1baa2f1c6 --- /dev/null +++ b/gm/hardstop_gradients.cpp @@ -0,0 +1,145 @@ +/* + * Copyright 2016 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +/* + * This GM presents a variety of different gradients with different + * tile modes. Each entry in the table is a rectangle with a linear + * gradient that spans from its left edge to its right edge. The rows + * in the table represent different color/position configurations, + * while the columns in the table represent different tile modes. In + * order to highlight the differences between tile modes, the gradient + * starts and ends at 30 pixel inset from either side of the rectangle. + * + * | Clamp Repeat Mirror + * _____________________|___________________________________________ + * 2-color | rect00 rect01 rect02 + * 3-color | rect10 rect11 rect12 + * 5-color hard stop | rect20 rect21 rect22 + * 5-color edge case 1 | rect30 rect31 rect32 + * 5-color edge case 2 | rect40 rect41 rect42 + * + * The LAST two t-values in edge case 1 are the same, while the FIRST + * two t-values in edge case 2 are the same. + */ + +#include "gm.h" + +#include "SkGradientShader.h" + +const int WIDTH = 500; +const int HEIGHT = 500; + +const int NUM_ROWS = 5; +const int NUM_COLS = 3; + +const int CELL_WIDTH = WIDTH / NUM_COLS; +const int CELL_HEIGHT = HEIGHT / NUM_ROWS; + +const int PAD_WIDTH = 3; +const int PAD_HEIGHT = 3; + +const int RECT_WIDTH = CELL_WIDTH - (2 * PAD_WIDTH); +const int RECT_HEIGHT = CELL_HEIGHT - (2 * PAD_HEIGHT); + +static void shade_rect(SkCanvas* canvas, sk_sp<SkShader> shader, int cellRow, int cellCol) { + SkPaint paint; + paint.setShader(shader); + + SkRect rect = SkRect::MakeXYWH(SkIntToScalar(cellCol * CELL_WIDTH + PAD_WIDTH), + SkIntToScalar(cellRow * CELL_HEIGHT + PAD_HEIGHT), + SkIntToScalar(RECT_WIDTH), + SkIntToScalar(RECT_HEIGHT)); + + canvas->drawRect(rect, paint); +} + +static void create_gradient_points(int cellRow, int cellCol, SkPoint points[2]) { + const int X_OFFSET = 30; + + auto x0 = SkIntToScalar(cellCol * CELL_WIDTH + PAD_WIDTH + X_OFFSET); + auto x1 = SkIntToScalar((cellCol+1) * CELL_WIDTH - PAD_WIDTH - X_OFFSET); + auto y = SkIntToScalar(cellRow * CELL_HEIGHT + PAD_HEIGHT + RECT_HEIGHT/2); + + points[0] = SkPoint::Make(x0, y); + points[1] = SkPoint::Make(x1, y); +} + +class HardstopGradientShaderGM : public skiagm::GM { +public: + HardstopGradientShaderGM() { + + } + +protected: + SkString onShortName() override { + return SkString("hardstop_gradients"); + } + + SkISize onISize() override { + return SkISize::Make(512, 512); + } + + void onDraw(SkCanvas* canvas) override { + SkPoint points[2]; + + SkColor colors[] = { + SK_ColorRED, + SK_ColorGREEN, + SK_ColorBLUE, + SK_ColorYELLOW, + SK_ColorMAGENTA, + }; + + SkScalar row3[] = {0.00f, 0.25f, 0.50f, 0.50f, 1.00f}; + SkScalar row4[] = {0.00f, 0.25f, 0.50f, 1.00f, 1.00f}; + SkScalar row5[] = {0.00f, 0.00f, 0.50f, 0.50f, 1.00f}; + + SkScalar* positions[] = { + nullptr, + nullptr, + row3, + row4, + row5, + }; + + int numGradientColors[] = { + 2, + 3, + 5, + 5, + 5, + }; + + SkShader::TileMode tilemodes[] = { + SkShader::kClamp_TileMode, + SkShader::kRepeat_TileMode, + SkShader::kMirror_TileMode, + }; + + for (int cellRow = 0; cellRow < NUM_ROWS; cellRow++) { + for (int cellCol = 0; cellCol < NUM_COLS; cellCol++) { + create_gradient_points(cellRow, cellCol, points); + + auto shader = SkGradientShader::MakeLinear( + points, + colors, + positions[cellRow], + numGradientColors[cellRow], + tilemodes[cellCol], + 0, + nullptr); + + shade_rect(canvas, shader, cellRow, cellCol); + } + } + } + +private: + typedef skiagm::GM INHERITED; +}; + +DEF_GM(return new HardstopGradientShaderGM;) |