Beginning of support for texture rectangles.

tests/RectangleTextureTest.cpp

Index: tests/RectangleTextureTest.cpp
diff --git a/tests/RectangleTextureTest.cpp b/tests/RectangleTextureTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a98dd3458be8d2ee44a5763873eaa8886077bb9b
--- /dev/null
+++ b/tests/RectangleTextureTest.cpp
@@ -0,0 +1,206 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Test.h"
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#include "GrDrawContext.h"
+#include "gl/GrGLGpu.h"
+#include "gl/GrGLUtil.h"
+#include "gl/SkGLContext.h"
+
+static void test_read_pixels(skiatest::Reporter* reporter, GrContext* context,
+                             GrTexture* rectangleTexture, uint32_t expectedPixelValues[]) {
+    int pixelCnt = rectangleTexture->width() * rectangleTexture->height();
+    SkAutoTMalloc<uint32_t> pixels(pixelCnt);
+    memset(pixels.get(), 0, sizeof(uint32_t)*pixelCnt);
+    bool read = rectangleTexture->readPixels(0, 0, rectangleTexture->width(),
+                                            rectangleTexture->height(), kRGBA_8888_GrPixelConfig,
+                                            pixels.get());
+    if (!read) {
+        ERRORF(reporter, "Error reading rectangle texture.");
+    }
+    for (int i = 0; i < pixelCnt; ++i) {
+        if (pixels.get()[i] != expectedPixelValues[i]) {
+            ERRORF(reporter, "Error, rectangle texture pixel value %d should be 0x%08x,"
+                             " got 0x%08x.", i, expectedPixelValues[i], pixels.get()[i]);
+            break;
+        }
+    }
+}
+
+static void test_write_pixels(skiatest::Reporter* reporter, GrContext* context,
+                              GrTexture* rectangleTexture) {
+    int pixelCnt = rectangleTexture->width() * rectangleTexture->height();
+    SkAutoTMalloc<uint32_t> pixels(pixelCnt);
+    for (int y = 0; y < rectangleTexture->width(); ++y) {
+        for (int x = 0; x < rectangleTexture->height(); ++x) {
+            pixels.get()[y * rectangleTexture->width() + x] = GrColorPackRGBA(x, y, x + y, x * y);
+        }
+    }
+    bool write = rectangleTexture->writePixels(0, 0, rectangleTexture->width(),
+                                               rectangleTexture->height(), kRGBA_8888_GrPixelConfig,
+                                               pixels.get());
+    if (!write) {
+        ERRORF(reporter, "Error writing to rectangle texture.");
+    }
+    test_read_pixels(reporter, context, rectangleTexture, pixels.get());
+}
+
+static void test_copy_surface_src(skiatest::Reporter* reporter, GrContext* context,
+                                  GrTexture* rectangleTexture, uint32_t expectedPixelValues[]) {
+    GrSurfaceDesc copyDstDesc;
+    copyDstDesc.fConfig = kRGBA_8888_GrPixelConfig;
+    copyDstDesc.fWidth = rectangleTexture->width();
+    copyDstDesc.fHeight = rectangleTexture->height();
+    copyDstDesc.fFlags = kRenderTarget_GrSurfaceFlag;
+    SkAutoTUnref<GrTexture> dst(context->textureProvider()->createTexture(copyDstDesc, true));
+    context->copySurface(dst, rectangleTexture);
+    test_read_pixels(reporter, context, dst, expectedPixelValues);
+}
+
+static void test_copy_surface_dst(skiatest::Reporter* reporter, GrContext* context,
+                                  GrTexture* rectangleTexture) {
+    int pixelCnt = rectangleTexture->width() * rectangleTexture->height();
+    SkAutoTMalloc<uint32_t> pixels(pixelCnt);
+    for (int y = 0; y < rectangleTexture->width(); ++y) {
+        for (int x = 0; x < rectangleTexture->height(); ++x) {
+            pixels.get()[y * rectangleTexture->width() + x] = GrColorPackRGBA(y, x, x * y, x *+ y);
+        }
+    }
+
+    GrSurfaceDesc copySrcDesc;
+    copySrcDesc.fConfig = kRGBA_8888_GrPixelConfig;
+    copySrcDesc.fWidth = rectangleTexture->width();
+    copySrcDesc.fHeight = rectangleTexture->height();
+    copySrcDesc.fFlags = kRenderTarget_GrSurfaceFlag;
+    SkAutoTUnref<GrTexture> src(context->textureProvider()->createTexture(copySrcDesc, true,
+                                                                          pixels.get(), 0));
+
+    context->copySurface(rectangleTexture, src);
+    test_read_pixels(reporter, context, rectangleTexture, pixels.get());
+}
+
+static void test_clear(skiatest::Reporter* reporter, GrContext* context,
+                       GrTexture* rectangleTexture) {
+    if (rectangleTexture->asRenderTarget()) {
+        SkAutoTUnref<GrDrawContext> dc(context->drawContext(rectangleTexture->asRenderTarget()));
+        if (!dc) {
+            ERRORF(reporter, "Could not get GrDrawContext for rectangle texture.");
+            return;
+        }
+
+        // Clear the whole thing.
+        GrColor color0 = GrColorPackRGBA(0xA, 0xB, 0xC, 0xD);
+        dc->clear(nullptr, color0, false);
+
+        int w = rectangleTexture->width();
+        int h = rectangleTexture->height();
+        int pixelCnt = w * h;
+        SkAutoTMalloc<uint32_t> expectedPixels(pixelCnt);
+
+        // The clear color is a GrColor, our readback is to kRGBA_8888, which may be different.
+        uint32_t expectedColor0;
+        uint8_t* expectedBytes0 = SkTCast<uint8_t*>(&expectedColor0);
+        expectedBytes0[0] = GrColorUnpackR(color0);
+        expectedBytes0[1] = GrColorUnpackG(color0);
+        expectedBytes0[2] = GrColorUnpackB(color0);
+        expectedBytes0[3] = GrColorUnpackA(color0);
+        for (int i = 0; i < rectangleTexture->width() * rectangleTexture->height(); ++i) {
+            expectedPixels.get()[i] = expectedColor0;
+        }
+
+        // Clear the the top to a different color.
+        GrColor color1 = GrColorPackRGBA(0x1, 0x2, 0x3, 0x4);
+        SkIRect rect = SkIRect::MakeWH(w, h/2);
+        dc->clear(&rect, color1, false);
+
+        uint32_t expectedColor1;
+        uint8_t* expectedBytes1 = SkTCast<uint8_t*>(&expectedColor1);
+        expectedBytes1[0] = GrColorUnpackR(color1);
+        expectedBytes1[1] = GrColorUnpackG(color1);
+        expectedBytes1[2] = GrColorUnpackB(color1);
+        expectedBytes1[3] = GrColorUnpackA(color1);
+
+        for (int y = 0; y < h/2; ++y) {
+            for (int x = 0; x < w; ++x) {
+                expectedPixels.get()[y * h + x] = expectedColor1;
+            }
+        }
+
+        test_read_pixels(reporter, context, rectangleTexture, expectedPixels.get());
+    }
+}
+
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RectangleTexture, reporter, context, glContext) {    
+    static const int kWidth = 13;
+    static const int kHeight = 13;
+
+    GrColor pixels[kWidth * kHeight];
+    for (int y = 0; y < kHeight; ++y) {
+        for (int x = 0; x < kWidth; ++x) {
+            pixels[y * kWidth + x] = y * kWidth + x;
+        }
+    }
+
+    for (int origin = 0; origin < 2; ++origin) {
+        GrGLuint rectTexID = glContext->createTextureRectangle(kWidth, kHeight, GR_GL_RGBA,
+                                                               GR_GL_RGBA, GR_GL_UNSIGNED_BYTE,
+                                                               pixels);
+
+        if (!rectTexID) {
+            return;
+        }
+
+        // Let GrContext know that we messed with the GL context directly.
+        context->resetContext();
+
+        // Wrap the rectangle texture ID in a GrTexture
+        GrGLTextureInfo rectangleInfo;
+        rectangleInfo.fID = rectTexID;
+        rectangleInfo.fTarget = GR_GL_TEXTURE_RECTANGLE;
+
+        GrBackendTextureDesc rectangleDesc;
+        rectangleDesc.fFlags = kRenderTarget_GrBackendTextureFlag;
+        rectangleDesc.fConfig = kRGBA_8888_GrPixelConfig;
+        rectangleDesc.fWidth = kWidth;
+        rectangleDesc.fHeight = kHeight;
+        rectangleDesc.fOrigin = origin ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;
+        rectangleDesc.fTextureHandle = reinterpret_cast<GrBackendObject>(&rectangleInfo);
+
+        GrColor refPixels[kWidth * kHeight];
+        bool flipRef = rectangleDesc.fOrigin == kBottomLeft_GrSurfaceOrigin;
+        for (int y = 0; y < kHeight; ++y) {
+            for (int x = 0; x < kWidth; ++x) {
+                int y0 = flipRef ? kHeight - y - 1 : y;
+                refPixels[y * kWidth + x] = pixels[y0 * kWidth + x];
+            }
+        }
+
+        SkAutoTUnref<GrTexture> rectangleTexture(
+            context->textureProvider()->wrapBackendTexture(rectangleDesc));
+        if (!rectangleTexture) {
+            ERRORF(reporter, "Error wrapping rectangle texture in GrTexture.");
+            GR_GL_CALL(glContext->gl(), DeleteTextures(1, &rectTexID));
+            continue;
+        }
+
+        test_read_pixels(reporter, context, rectangleTexture, refPixels);
+
+        test_copy_surface_src(reporter, context, rectangleTexture, refPixels);
+
+        test_copy_surface_dst(reporter, context, rectangleTexture);
+
+        test_write_pixels(reporter, context, rectangleTexture);
+
+        test_clear(reporter, context, rectangleTexture);
+
+        GR_GL_CALL(glContext->gl(), DeleteTextures(1, &rectTexID));
+    }
+}
+
+#endif