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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkGradientShader.h"
#include "SkImage.h"
#include "SkPatchUtils.h"
#include "SkPath.h"
static sk_sp<SkShader> make_shader() {
const SkColor colors[] = {
SK_ColorRED, SK_ColorCYAN, SK_ColorGREEN, SK_ColorWHITE, SK_ColorMAGENTA, SK_ColorBLUE,
SK_ColorYELLOW,
};
const SkPoint pts[] = { { 100.f / 4.f, 0.f }, { 3.f * 100.f / 4.f, 100.f } };
return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
SkShader::kMirror_TileMode);
}
static void draw_control_points(SkCanvas* canvas, const SkPoint cubics[12]) {
//draw control points
SkPaint paint;
SkPoint bottom[SkPatchUtils::kNumPtsCubic];
SkPatchUtils::GetBottomCubic(cubics, bottom);
SkPoint top[SkPatchUtils::kNumPtsCubic];
SkPatchUtils::GetTopCubic(cubics, top);
SkPoint left[SkPatchUtils::kNumPtsCubic];
SkPatchUtils::GetLeftCubic(cubics, left);
SkPoint right[SkPatchUtils::kNumPtsCubic];
SkPatchUtils::GetRightCubic(cubics, right);
paint.setColor(SK_ColorBLACK);
paint.setStrokeWidth(0.5f);
SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] };
canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom + 1, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top + 1, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left + 1, paint);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right + 1, paint);
paint.setStrokeWidth(2);
paint.setColor(SK_ColorRED);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint);
paint.setColor(SK_ColorBLUE);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom + 1, paint);
paint.setColor(SK_ColorCYAN);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top + 1, paint);
paint.setColor(SK_ColorYELLOW);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left + 1, paint);
paint.setColor(SK_ColorGREEN);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right + 1, paint);
}
// The order of the colors and points is clockwise starting at upper-left corner.
const SkPoint gCubics[SkPatchUtils::kNumCtrlPts] = {
//top points
{100,100},{150,50},{250,150}, {300,100},
//right points
{250, 150},{350,250},
//bottom points
{300,300},{250,250},{150,350},{100,300},
//left points
{50,250},{150,150}
};
const SkPoint gTexCoords[SkPatchUtils::kNumCorners] = {
{0.0f, 0.0f}, {100.0f, 0.0f}, {100.0f,100.0f}, {0.0f, 100.0f}
};
static void dopatch(SkCanvas* canvas, const SkColor colors[], sk_sp<SkImage> img = nullptr) {
SkPaint paint;
const SkBlendMode modes[] = {
SkBlendMode::kSrc,
SkBlendMode::kDst,
SkBlendMode::kModulate,
};
SkPoint texStorage[4];
const SkPoint* tex = gTexCoords;
sk_sp<SkShader> shader;
if (img) {
SkScalar w = img->width();
SkScalar h = img->height();
shader = img->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
texStorage[0].set(0, 0);
texStorage[1].set(w, 0);
texStorage[2].set(w, h);
texStorage[3].set(0, h);
tex = texStorage;
} else {
shader = make_shader();
}
canvas->save();
for (int y = 0; y < 3; y++) {
for (int x = 0; x < 4; x++) {
canvas->save();
canvas->translate(x * 350.0f, y * 350.0f);
switch (x) {
case 0:
canvas->drawPatch(gCubics, nullptr, nullptr, modes[y], paint);
break;
case 1:
canvas->drawPatch(gCubics, colors, nullptr, modes[y], paint);
break;
case 2:
paint.setShader(shader);
canvas->drawPatch(gCubics, nullptr, tex, modes[y], paint);
paint.setShader(nullptr);
break;
case 3:
paint.setShader(shader);
canvas->drawPatch(gCubics, colors, tex, modes[y], paint);
paint.setShader(nullptr);
break;
default:
break;
}
draw_control_points(canvas, gCubics);
canvas->restore();
}
}
canvas->restore();
}
DEF_SIMPLE_GM(patch_primitive, canvas, 1500, 1100) {
const SkColor colors[SkPatchUtils::kNumCorners] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
};
dopatch(canvas, colors);
}
#include "Resources.h"
DEF_SIMPLE_GM(patch_image, canvas, 1500, 1100) {
const SkColor colors[SkPatchUtils::kNumCorners] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
};
dopatch(canvas, colors, GetResourceAsImage("images/mandrill_128.png"));
}
DEF_SIMPLE_GM(patch_alpha, canvas, 1500, 1100) {
const SkColor colors[SkPatchUtils::kNumCorners] = {
SK_ColorRED, 0x0000FF00, SK_ColorBLUE, 0x00FF00FF,
};
dopatch(canvas, colors);
}
// These two should look the same (one patch, one simple path)
DEF_SIMPLE_GM(patch_alpha_test, canvas, 550, 250) {
canvas->translate(-75, -75);
const SkColor colors[SkPatchUtils::kNumCorners] = {
0x80FF0000, 0x80FF0000, 0x80FF0000, 0x80FF0000,
};
SkPaint paint;
canvas->drawPatch(gCubics, colors, nullptr, SkBlendMode::kModulate, paint);
canvas->translate(300, 0);
SkPath path;
path.moveTo(gCubics[0]);
path.cubicTo(gCubics[ 1], gCubics[ 2], gCubics[ 3]);
path.cubicTo(gCubics[ 4], gCubics[ 5], gCubics[ 6]);
path.cubicTo(gCubics[ 7], gCubics[ 8], gCubics[ 9]);
path.cubicTo(gCubics[10], gCubics[11], gCubics[ 0]);
paint.setColor(colors[0]);
canvas->drawPath(path, paint);
}
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