skia2/gm/gradient_matrix.cpp
commit-bot@chromium.org e2b193ca5c Revert of remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/)
Reason for revert:
does not address all legacy callsites in chrome.

e.g.

[13:45:32.091872] ../../ui/native_theme/native_theme_base.cc:608:76: error: no matching function for call to ‘SkGradientShader::CreateLinear(SkPoint [3], SkColor [3], NULL, int, SkShader::TileMode, NULL)’
[13:45:32.091919]            gradient_bounds, colors, NULL, 3, SkShader::kClamp_TileMode, NULL));


Original issue's description:
> remove unused (by clients) SkUnitMapper
>
> BUG=skia:
>
> Committed: http://code.google.com/p/skia/source/detail?r=14761

R=robertphillips@google.com, scroggo@google.com, george@mozilla.com
TBR=george@mozilla.com, robertphillips@google.com, scroggo@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: reed@google.com

Review URL: https://codereview.chromium.org/287063009

git-svn-id: http://skia.googlecode.com/svn/trunk@14763 2bbb7eff-a529-9590-31e7-b0007b416f81
2014-05-16 13:49:08 +00:00

151 lines
4.5 KiB
C++

/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkColor.h"
#include "SkGradientShader.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkPoint.h"
#include "SkRect.h"
#include "SkRefCnt.h"
#include "SkScalar.h"
#include "SkSize.h"
#include "SkString.h"
#include "gm.h"
static const SkColor gColors[] = {
SK_ColorRED, SK_ColorYELLOW
};
// These annoying defines are necessary, because the only other alternative
// is to use SkIntToScalar(...) everywhere.
static const SkScalar sZero = 0;
static const SkScalar sHalf = SK_ScalarHalf;
static const SkScalar sOne = SK_Scalar1;
// These arrays define the gradient stop points
// as x1, y1, x2, y2 per gradient to draw.
static const SkPoint linearPts[][2] = {
{{sZero, sZero}, {sOne, sZero}},
{{sZero, sZero}, {sZero, sOne}},
{{sOne, sZero}, {sZero, sZero}},
{{sZero, sOne}, {sZero, sZero}},
{{sZero, sZero}, {sOne, sOne}},
{{sOne, sOne}, {sZero, sZero}},
{{sOne, sZero}, {sZero, sOne}},
{{sZero, sOne}, {sOne, sZero}}
};
static const SkPoint radialPts[][2] = {
{{sZero, sHalf}, {sOne, sHalf}},
{{sHalf, sZero}, {sHalf, sOne}},
{{sOne, sHalf}, {sZero, sHalf}},
{{sHalf, sOne}, {sHalf, sZero}},
{{sZero, sZero}, {sOne, sOne}},
{{sOne, sOne}, {sZero, sZero}},
{{sOne, sZero}, {sZero, sOne}},
{{sZero, sOne}, {sOne, sZero}}
};
// These define the pixels allocated to each gradient image.
static const SkScalar TESTGRID_X = SkIntToScalar(200);
static const SkScalar TESTGRID_Y = SkIntToScalar(200);
static const int IMAGES_X = 4; // number of images per row
static SkShader* make_linear_gradient(const SkPoint pts[2], const SkMatrix& localMatrix) {
return SkGradientShader::CreateLinear(pts, gColors, NULL, SK_ARRAY_COUNT(gColors),
SkShader::kClamp_TileMode, NULL, 0, &localMatrix);
}
static SkShader* make_radial_gradient(const SkPoint pts[2], const SkMatrix& localMatrix) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
float radius = (center - pts[0]).length();
return SkGradientShader::CreateRadial(center, radius, gColors, NULL, SK_ARRAY_COUNT(gColors),
SkShader::kClamp_TileMode, NULL, 0, &localMatrix);
}
static void draw_gradients(SkCanvas* canvas,
SkShader* (*makeShader)(const SkPoint[2], const SkMatrix&),
const SkPoint ptsArray[][2], int numImages) {
// Use some nice prime numbers for the rectangle and matrix with
// different scaling along the x and y axes (which is the bug this
// test addresses, where incorrect order of operations mixed up the axes)
SkRect rectGrad = {
SkIntToScalar(43), SkIntToScalar(61),
SkIntToScalar(181), SkIntToScalar(167) };
SkMatrix shaderMat;
shaderMat.setScale(rectGrad.width(), rectGrad.height());
shaderMat.postTranslate(rectGrad.left(), rectGrad.top());
canvas->save();
for (int i = 0; i < numImages; i++) {
// Advance line downwards if necessary.
if (i % IMAGES_X == 0 && i != 0) {
canvas->restore();
canvas->translate(0, TESTGRID_Y);
canvas->save();
}
// Setup shader and draw.
SkAutoTUnref<SkShader> shader(makeShader(*ptsArray, shaderMat));
SkPaint paint;
paint.setShader(shader);
canvas->drawRect(rectGrad, paint);
// Advance to next position.
canvas->translate(TESTGRID_X, 0);
ptsArray++;
}
canvas->restore();
}
namespace skiagm {
class GradientMatrixGM : public GM {
public:
GradientMatrixGM() {
this->setBGColor(0xFFDDDDDD);
}
protected:
virtual uint32_t onGetFlags() const SK_OVERRIDE {
return kSkipTiled_Flag;
}
SkString onShortName() SK_OVERRIDE {
return SkString("gradient_matrix");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(800, 800);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
draw_gradients(canvas, &make_linear_gradient,
linearPts, SK_ARRAY_COUNT(linearPts));
canvas->translate(0, TESTGRID_Y);
draw_gradients(canvas, &make_radial_gradient,
radialPts, SK_ARRAY_COUNT(radialPts));
}
private:
typedef GM INHERITED;
};
DEF_GM( return new GradientMatrixGM; )
}