120 lines
4.1 KiB
C++
120 lines
4.1 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkMatrix.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkTileMode.h"
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#include "include/core/SkTypes.h"
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#include "include/effects/SkGradientShader.h"
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constexpr SkColor gColors[] = {
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SK_ColorRED, SK_ColorYELLOW
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};
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// These annoying defines are necessary, because the only other alternative
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// is to use SkIntToScalar(...) everywhere.
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constexpr SkScalar sZero = 0;
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constexpr SkScalar sHalf = SK_ScalarHalf;
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constexpr SkScalar sOne = SK_Scalar1;
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// These arrays define the gradient stop points
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// as x1, y1, x2, y2 per gradient to draw.
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constexpr SkPoint linearPts[][2] = {
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{{sZero, sZero}, {sOne, sZero}},
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{{sZero, sZero}, {sZero, sOne}},
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{{sOne, sZero}, {sZero, sZero}},
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{{sZero, sOne}, {sZero, sZero}},
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{{sZero, sZero}, {sOne, sOne}},
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{{sOne, sOne}, {sZero, sZero}},
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{{sOne, sZero}, {sZero, sOne}},
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{{sZero, sOne}, {sOne, sZero}}
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};
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constexpr SkPoint radialPts[][2] = {
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{{sZero, sHalf}, {sOne, sHalf}},
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{{sHalf, sZero}, {sHalf, sOne}},
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{{sOne, sHalf}, {sZero, sHalf}},
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{{sHalf, sOne}, {sHalf, sZero}},
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{{sZero, sZero}, {sOne, sOne}},
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{{sOne, sOne}, {sZero, sZero}},
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{{sOne, sZero}, {sZero, sOne}},
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{{sZero, sOne}, {sOne, sZero}}
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};
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// These define the pixels allocated to each gradient image.
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constexpr SkScalar TESTGRID_X = SkIntToScalar(200);
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constexpr SkScalar TESTGRID_Y = SkIntToScalar(200);
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constexpr int IMAGES_X = 4; // number of images per row
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static sk_sp<SkShader> make_linear_gradient(const SkPoint pts[2], const SkMatrix& localMatrix) {
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return SkGradientShader::MakeLinear(pts, gColors, nullptr, SK_ARRAY_COUNT(gColors),
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SkTileMode::kClamp, 0, &localMatrix);
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}
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static sk_sp<SkShader> make_radial_gradient(const SkPoint pts[2], const SkMatrix& localMatrix) {
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SkPoint center;
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center.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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float radius = (center - pts[0]).length();
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return SkGradientShader::MakeRadial(center, radius, gColors, nullptr, SK_ARRAY_COUNT(gColors),
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SkTileMode::kClamp, 0, &localMatrix);
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}
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static void draw_gradients(SkCanvas* canvas,
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sk_sp<SkShader> (*makeShader)(const SkPoint[2], const SkMatrix&),
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const SkPoint ptsArray[][2], int numImages) {
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// Use some nice prime numbers for the rectangle and matrix with
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// different scaling along the x and y axes (which is the bug this
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// test addresses, where incorrect order of operations mixed up the axes)
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SkRect rectGrad = {
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SkIntToScalar(43), SkIntToScalar(61),
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SkIntToScalar(181), SkIntToScalar(167) };
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SkMatrix shaderMat;
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shaderMat.setScale(rectGrad.width(), rectGrad.height());
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shaderMat.postTranslate(rectGrad.left(), rectGrad.top());
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canvas->save();
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for (int i = 0; i < numImages; i++) {
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// Advance line downwards if necessary.
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if (i % IMAGES_X == 0 && i != 0) {
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canvas->restore();
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canvas->translate(0, TESTGRID_Y);
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canvas->save();
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}
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SkPaint paint;
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paint.setShader(makeShader(*ptsArray, shaderMat));
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canvas->drawRect(rectGrad, paint);
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// Advance to next position.
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canvas->translate(TESTGRID_X, 0);
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ptsArray++;
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}
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canvas->restore();
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}
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DEF_SIMPLE_GM_BG(gradient_matrix, canvas, 800, 800, 0xFFDDDDDD) {
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draw_gradients(canvas, &make_linear_gradient,
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linearPts, SK_ARRAY_COUNT(linearPts));
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canvas->translate(0, TESTGRID_Y);
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draw_gradients(canvas, &make_radial_gradient,
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radialPts, SK_ARRAY_COUNT(radialPts));
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}
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