| /* |
| * Copyright 2018 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 gradients meant to test the correctness of the analytic unrolled |
| * binary gradient colorizer, which can handle arbitrary gradients with 1 to 8 interpolation |
| * intervals. These intervals can be either hardstops or smooth color transitions. |
| * |
| * It produces an image similar to that of GM_hardstop_gradients, but is arranged as follows: |
| * |
| * | Clamp | |
| * |________________| |
| * | M1 M2 M3 M4 | |
| * ___________|________________| |
| * 1 | |
| * 2 | |
| * 3 | |
| * 4 | |
| * 5 | |
| * 6 | |
| * 7 | |
| * 8 | |
| * The M-modes are different ways of interlveaving hardstops with smooth transitions: |
| * - M1 = All smooth transitions |
| * - M2 = All hard stops |
| * - M5 = Alternating smooth then hard |
| * - M6 = Alternating hard then smooth |
| * |
| * Only clamping is tested since this is focused more on within the interpolation region behavior, |
| * compared to overall behavior. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.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" |
| #include "include/private/base/SkTemplates.h" |
| |
| using namespace skia_private; |
| |
| // All positions must be divided by the target interval count, which will produce the expected |
| // normalized position array for that interval number (assuming an appropriate color count is |
| // provided). |
| const int M1_POSITIONS[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 }; |
| const int M2_POSITIONS[] = { 0, 1,1, 2,2, 3,3, 4,4, 5,5, 6,6, 7,7, 8 }; |
| const int M3_POSITIONS[] = { 0, 1, 2,2, 3, 4,4, 5, 6,6, 7, 8 }; |
| const int M4_POSITIONS[] = { 0, 1,1, 2, 3,3, 4, 5,5, 6, 7,7, 8 }; |
| |
| // Color count = index of first occurrence of interval count value in Mx_POSITIONS array. |
| const int INT1_COLOR_COUNTS[] = { 2, 2, 2, 2 }; |
| const int INT2_COLOR_COUNTS[] = { 3, 4, 3, 4 }; |
| const int INT3_COLOR_COUNTS[] = { 4, 6, 5, 5 }; |
| const int INT4_COLOR_COUNTS[] = { 5, 8, 6, 7 }; |
| const int INT5_COLOR_COUNTS[] = { 6, 10, 8, 8 }; |
| const int INT6_COLOR_COUNTS[] = { 7, 12, 9, 10 }; |
| const int INT7_COLOR_COUNTS[] = { 8, 14, 11, 11 }; |
| const int INT8_COLOR_COUNTS[] = { 9, 16, 12, 13 }; |
| |
| // Cycle through defined colors for positions 0 through 8. |
| const SkColor COLORS[] = { |
| SK_ColorDKGRAY, |
| SK_ColorRED, |
| SK_ColorYELLOW, |
| SK_ColorGREEN, |
| SK_ColorCYAN, |
| SK_ColorBLUE, |
| SK_ColorMAGENTA, |
| SK_ColorBLACK, |
| SK_ColorLTGRAY |
| }; |
| |
| const int* INTERVAL_COLOR_COUNTS[] = { |
| INT1_COLOR_COUNTS, |
| INT2_COLOR_COUNTS, |
| INT3_COLOR_COUNTS, |
| INT4_COLOR_COUNTS, |
| INT5_COLOR_COUNTS, |
| INT6_COLOR_COUNTS, |
| INT7_COLOR_COUNTS, |
| INT8_COLOR_COUNTS |
| }; |
| const int COLOR_COUNT = std::size(COLORS); |
| |
| const int* M_POSITIONS[] = { |
| M1_POSITIONS, |
| M2_POSITIONS, |
| M3_POSITIONS, |
| M4_POSITIONS |
| }; |
| |
| const int WIDTH = 500; |
| const int HEIGHT = 500; |
| |
| const int NUM_ROWS = 8; |
| const int NUM_COLS = 4; |
| |
| 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); |
| |
| canvas->save(); |
| canvas->translate(SkIntToScalar(cellCol * CELL_WIDTH + PAD_WIDTH), |
| SkIntToScalar(cellRow * CELL_HEIGHT + PAD_HEIGHT)); |
| |
| const SkRect rect = SkRect::MakeWH(SkIntToScalar(RECT_WIDTH), SkIntToScalar(RECT_HEIGHT)); |
| canvas->drawRect(rect, paint); |
| canvas->restore(); |
| } |
| |
| class AnalyticGradientShaderGM : public skiagm::GM { |
| public: |
| AnalyticGradientShaderGM() { |
| |
| } |
| |
| protected: |
| SkString getName() const override { return SkString("analytic_gradients"); } |
| |
| SkISize getISize() override { return SkISize::Make(1024, 512); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| const SkPoint points[2] = { SkPoint::Make(0, 0), SkPoint::Make(RECT_WIDTH, 0.0) }; |
| |
| for (int cellRow = 0; cellRow < NUM_ROWS; cellRow++) { |
| // Each interval has 4 different color counts, one per mode |
| const int* colorCounts = INTERVAL_COLOR_COUNTS[cellRow]; // Has len = 4 |
| |
| for (int cellCol = 0; cellCol < NUM_COLS; cellCol++) { |
| // create_gradient_points(cellRow, cellCol, points); |
| |
| // Get the color count dependent on interval and mode |
| int colorCount = colorCounts[cellCol]; |
| // Get the positions given the mode |
| const int* layout = M_POSITIONS[cellCol]; |
| |
| // Collect positions and colors specific to the interval+mode normalizing the |
| // position based on the interval count (== cellRow+1) |
| AutoSTMalloc<4, SkColor> colors(colorCount); |
| AutoSTMalloc<4, SkScalar> positions(colorCount); |
| int j = 0; |
| for (int i = 0; i < colorCount; i++) { |
| positions[i] = SkIntToScalar(layout[i]) / (cellRow + 1); |
| colors[i] = COLORS[j % COLOR_COUNT]; |
| j++; |
| } |
| |
| auto shader = SkGradientShader::MakeLinear( |
| points, |
| colors.get(), |
| positions.get(), |
| colorCount, |
| SkTileMode::kClamp, |
| 0, |
| nullptr); |
| |
| shade_rect(canvas, shader, cellRow, cellCol); |
| } |
| } |
| } |
| |
| private: |
| using INHERITED = skiagm::GM; |
| }; |
| |
| DEF_GM(return new AnalyticGradientShaderGM;) |