rectangletexture.cpp revision 9d524f22bfde5dc3dc8f48e1be39bdebd3bb0304 
1/*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8// This test only works with the GPU backend.
9
10#include "gm.h"
11
12#if SK_SUPPORT_GPU
13
14#include "GrContext.h"
15#include "GrTest.h"
16#include "SkBitmap.h"
17#include "SkGradientShader.h"
18#include "SkImage.h"
19
20namespace skiagm {
21class RectangleTexture : public GM {
22public:
23    RectangleTexture() {
24        this->setBGColor(0xFFFFFFFF);
25    }
26
27protected:
28    SkString onShortName() override {
29        return SkString("rectangle_texture");
30    }
31
32    SkISize onISize() override {
33        return SkISize::Make(1035, 240);
34    }
35
36    void fillPixels(int width, int height, void *pixels) {
37        SkBitmap bmp;
38        bmp.setInfo(SkImageInfo::MakeN32(width, height, kOpaque_SkAlphaType), width * 4);
39        bmp.setPixels(pixels);
40        SkPaint paint;
41        SkCanvas canvas(bmp);
42        SkPoint pts[] = { {0, 0}, {0, SkIntToScalar(height)} };
43        SkColor colors0[] = { 0xFF1060B0 , 0xFF102030 };
44        paint.setShader(SkGradientShader::MakeLinear(pts, colors0, nullptr, 2,
45                                                     SkShader::kClamp_TileMode));
46        canvas.drawPaint(paint);
47
48        SkColor colors1[] = { 0xFFA07010 , 0xFFA02080 };
49        paint.setAntiAlias(true);
50        paint.setShader(SkGradientShader::MakeLinear(pts, colors1, nullptr, 2,
51                                                     SkShader::kClamp_TileMode));
52        canvas.drawCircle(SkIntToScalar(width) / 2, SkIntToScalar(height) / 2,
53                          SkIntToScalar(width + height) / 5, paint);
54    }
55
56    sk_sp<SkImage> createRectangleTextureImg(GrContext* context, int width, int height,
57                                             void* pixels) {
58        if (!context) {
59            return nullptr;
60        }
61        GrGpu* gpu = context->getGpu();
62        if (!gpu) {
63            return nullptr;
64        }
65        const GrGLContext* glCtx = gpu->glContextForTesting();
66        if (!glCtx) {
67            return nullptr;
68        }
69
70        if (!(kGL_GrGLStandard == glCtx->standard() && glCtx->version() >= GR_GL_VER(3, 1)) &&
71            !glCtx->hasExtension("GL_ARB_texture_rectangle")) {
72            return nullptr;
73        }
74
75        // We will always create the GL texture as GL_RGBA, however the pixels uploaded may be
76        // be RGBA or BGRA, depending on how SkPMColor was compiled.
77        GrGLenum format;
78        if (kSkia8888_GrPixelConfig == kBGRA_8888_GrPixelConfig) {
79            format = GR_GL_BGRA;
80        } else {
81            SkASSERT(kSkia8888_GrPixelConfig == kRGBA_8888_GrPixelConfig);
82            format = GR_GL_RGBA;
83        }
84
85        const GrGLInterface* gl = glCtx->interface();
86// Useful for debugging whether errors result from use of RECTANGLE
87// #define TARGET GR_GL_TEXTURE_2D
88#define TARGET GR_GL_TEXTURE_RECTANGLE
89        GrGLuint id = 0;
90        GR_GL_CALL(gl, GenTextures(1, &id));
91        GR_GL_CALL(gl, BindTexture(TARGET, id));
92        GR_GL_CALL(gl, TexParameteri(TARGET, GR_GL_TEXTURE_MAG_FILTER,
93                                     GR_GL_NEAREST));
94        GR_GL_CALL(gl, TexParameteri(TARGET, GR_GL_TEXTURE_MIN_FILTER,
95                                     GR_GL_NEAREST));
96        GR_GL_CALL(gl, TexParameteri(TARGET, GR_GL_TEXTURE_WRAP_S,
97                                     GR_GL_CLAMP_TO_EDGE));
98        GR_GL_CALL(gl, TexParameteri(TARGET, GR_GL_TEXTURE_WRAP_T,
99                                     GR_GL_CLAMP_TO_EDGE));
100        GR_GL_CALL(gl, TexImage2D(TARGET, 0, GR_GL_RGBA, width, height, 0,
101                                  format, GR_GL_UNSIGNED_BYTE, pixels));
102
103
104        context->resetContext();
105        GrGLTextureInfo info;
106        info.fID = id;
107        info.fTarget = TARGET;
108        GrBackendTextureDesc desc;
109        desc.fConfig = kRGBA_8888_GrPixelConfig;
110        desc.fWidth = width;
111        desc.fHeight = height;
112        desc.fOrigin = kTopLeft_GrSurfaceOrigin;
113        desc.fTextureHandle = reinterpret_cast<GrBackendObject>(&info);
114        if (sk_sp<SkImage> image = SkImage::MakeFromAdoptedTexture(context, desc)) {
115            return image;
116        }
117        GR_GL_CALL(gl, DeleteTextures(1, &id));
118        return nullptr;
119    }
120
121    void onDraw(SkCanvas* canvas) override {
122        GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
123        GrContext* context;
124        if (!rt || !(context = rt->getContext())) {
125            skiagm::GM::DrawGpuOnlyMessage(canvas);
126            return;
127        }
128
129        static const int kWidth = 50;
130        static const int kHeight = 50;
131        static const SkScalar kPad = 5.f;
132
133        SkPMColor pixels[kWidth * kHeight];
134        this->fillPixels(kWidth, kHeight, pixels);
135        sk_sp<SkImage> rectImg(this->createRectangleTextureImg(context, kWidth, kHeight, pixels));
136
137        if (!rectImg) {
138            SkPaint paint;
139            paint.setAntiAlias(true);
140            static const char* kMsg = "Could not create rectangle texture image.";
141            canvas->drawText(kMsg, strlen(kMsg), 10, 100, paint);
142            return;
143        }
144
145        static const SkFilterQuality kQualities[] = {
146            kNone_SkFilterQuality,
147            kLow_SkFilterQuality,
148            kMedium_SkFilterQuality,
149            kHigh_SkFilterQuality,
150        };
151
152        static const SkScalar kScales[] = { 1.0f, 1.2f, 0.75f };
153
154        canvas->translate(kPad, kPad);
155        for (auto s : kScales) {
156            canvas->save();
157            canvas->scale(s, s);
158            for (auto q : kQualities) {
159                SkPaint plainPaint;
160                plainPaint.setFilterQuality(q);
161                canvas->drawImage(rectImg.get(), 0, 0, &plainPaint);
162                canvas->translate(kWidth + kPad, 0);
163
164                SkPaint clampPaint;
165                clampPaint.setFilterQuality(q);
166                clampPaint.setShader(rectImg->makeShader(SkShader::kClamp_TileMode,
167                                                         SkShader::kClamp_TileMode));
168                canvas->drawRect(SkRect::MakeWH(1.5f * kWidth, 1.5f * kHeight), clampPaint);
169                canvas->translate(kWidth * 1.5f + kPad, 0);
170
171                SkPaint repeatPaint;
172                repeatPaint.setFilterQuality(q);
173                repeatPaint.setShader(rectImg->makeShader(SkShader::kRepeat_TileMode,
174                                                          SkShader::kMirror_TileMode));
175                canvas->drawRect(SkRect::MakeWH(1.5f * kWidth, 1.5f * kHeight), repeatPaint);
176                canvas->translate(1.5f * kWidth + kPad, 0);
177            }
178            canvas->restore();
179            canvas->translate(0, kPad + 1.5f * kHeight * s);
180        }
181    }
182
183private:
184    typedef GM INHERITED;
185};
186
187DEF_GM(return new RectangleTexture;)
188}
189
190#endif
191