Store mipmap levels in deferred texture image

gm/deferredtextureimage.cpp

Index: gm/deferredtextureimage.cpp
diff --git a/gm/deferredtextureimage.cpp b/gm/deferredtextureimage.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6c7dd447cc3f02798f374a77973fc948105f800e
--- /dev/null
+++ b/gm/deferredtextureimage.cpp
@@ -0,0 +1,195 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include <vector>
+
+#include "gm.h"
+#include "GrContext.h"
+#include "SkMipMap.h"
+#include "Resources.h"
+
+#if SK_SUPPORT_GPU
+
+// Helper function that uploads the given SkImage using MakdeFromDeferredTextureImageData and then
+// draws the uploaded version at the specified coordinates.
+static void DrawDeferredTextureImageData(SkCanvas* canvas,
+                                         SkImage::DeferredTextureImageUsageParams* params) {
+    GrContext* context = canvas->getGrContext();
+    if (!context) {
+        skiagm::GM::DrawGpuOnlyMessage(canvas);
+        return;
+    }
+    SkAutoTUnref<GrContextThreadSafeProxy> proxy(context->threadSafeProxy());
+
+
+
+    sk_sp<SkImage> encodedImage = GetResourceAsImage("mandrill_512.png");
+    if (!encodedImage) {
+        SkDebugf("\nCould not load resource.\n");
+        return;
+    }
+
+    size_t requiredMemoryInBytes = encodedImage->getDeferredTextureImageData(
+        *proxy, params, 1, nullptr, SkSourceGammaTreatment::kRespect);
+    if (requiredMemoryInBytes == 0) {
+        SkDebugf("\nCould not create DeferredTextureImageData.\n");
+        return;
+    }
+
+    std::vector<uint8_t> memory;
+    memory.resize(requiredMemoryInBytes);
+    encodedImage->getDeferredTextureImageData(
+        *proxy, params, 1, memory.data(), SkSourceGammaTreatment::kRespect);
+    sk_sp<SkImage> uploadedEncodedImage = SkImage::MakeFromDeferredTextureImageData(
+        context, memory.data(), SkBudgeted::kNo);
+
+    canvas->drawImage(uploadedEncodedImage, 10, 10);
+
+
+
+    SkBitmap bitmap;
+    if (!GetResourceAsBitmap("mandrill_512.png", &bitmap)) {
+        SkDebugf("\nCould not decode resource.\n");
+        return;
+    }
+    sk_sp<SkImage> decodedImage = SkImage::MakeFromBitmap(bitmap);
+
+    requiredMemoryInBytes = decodedImage->getDeferredTextureImageData(
+        *proxy, params, 1, nullptr, SkSourceGammaTreatment::kRespect);
+    if (requiredMemoryInBytes == 0) {
+        SkDebugf("\nCould not create DeferredTextureImageData.\n");
+        return;
+    }
+
+    memory.resize(requiredMemoryInBytes);
+    decodedImage->getDeferredTextureImageData(
+        *proxy, params, 1, memory.data(), SkSourceGammaTreatment::kRespect);
+    sk_sp<SkImage> uploadedDecodedImage = SkImage::MakeFromDeferredTextureImageData(
+        context, memory.data(), SkBudgeted::kNo);
+
+    canvas->drawImage(uploadedDecodedImage, 512 + 20, 10);
+}
+
+static void DrawDeferredTextureImageMipMapTree(SkCanvas* canvas, SkImage* image,
+                                               SkImage::DeferredTextureImageUsageParams* params) {
+    GrContext* context = canvas->getGrContext();
+    if (!context) {
+        skiagm::GM::DrawGpuOnlyMessage(canvas);
+        return;
+    }
+    SkAutoTUnref<GrContextThreadSafeProxy> proxy(context->threadSafeProxy());
+
+    SkPaint paint;
+    paint.setFilterQuality(params->fQuality);
+
+    int mipLevelCount = SkMipMap::ComputeLevelCount(512, 512);
+    size_t requiredMemoryInBytes = image->getDeferredTextureImageData(
+        *proxy, params, 1, nullptr, SkSourceGammaTreatment::kRespect);
+    if (requiredMemoryInBytes == 0) {
+        SkDebugf("\nCould not create DeferredTextureImageData.\n");
+        return;
+    }
+
+    std::vector<uint8_t> memory;
+    memory.resize(requiredMemoryInBytes);
+    image->getDeferredTextureImageData(
+        *proxy, params, 1, memory.data(), SkSourceGammaTreatment::kRespect);
+    sk_sp<SkImage> uploadedImage = SkImage::MakeFromDeferredTextureImageData(
+        context, memory.data(), SkBudgeted::kNo);
+
+    // draw a column using deferred texture images
+    SkScalar offsetHeight = 10.f;
+    // handle base mipmap level
+    canvas->save();
+    canvas->translate(10.f, offsetHeight);
+    canvas->drawImage(uploadedImage, 0, 0, &paint);
+    canvas->restore();
+    offsetHeight += 512 + 10;
+    // handle generated mipmap levels
+    for (int i = 0; i < mipLevelCount; i++) {
+        SkISize mipSize = SkMipMap::ComputeLevelSize(512, 512, i);
+        canvas->save();
+        canvas->translate(10.f, offsetHeight);
+        canvas->scale(mipSize.width() / 512.f, mipSize.height() / 512.f);
+        canvas->drawImage(uploadedImage, 0, 0, &paint);
+        canvas->restore();
+        offsetHeight += mipSize.height() + 10;
+    }
+
+    // draw a column using SkImage
+    offsetHeight = 10;
+    // handle base mipmap level
+    canvas->save();
+    canvas->translate(512.f + 20.f, offsetHeight);
+    canvas->drawImage(image, 0, 0, &paint);
+    canvas->restore();
+    offsetHeight += 512 + 10;
+    // handle generated mipmap levels
+    for (int i = 0; i < mipLevelCount; i++) {
+        SkISize mipSize = SkMipMap::ComputeLevelSize(512, 512, i);
+        canvas->save();
+        canvas->translate(512.f + 20.f, offsetHeight);
+        canvas->scale(mipSize.width() / 512.f, mipSize.height() / 512.f);
+        canvas->drawImage(image, 0, 0, &paint);
+        canvas->restore();
+        offsetHeight += mipSize.height() + 10;
+    }
+}
+
+DEF_SIMPLE_GM(deferred_texture_image_default, canvas, 512 + 512 + 30, 512 + 20) {
+    SkImage::DeferredTextureImageUsageParams params;
+    DrawDeferredTextureImageData(canvas, &params);
+}
+
+DEF_SIMPLE_GM(deferred_texture_image_none, canvas, 512 + 512 + 30, 512 + 20) {
+    SkImage::DeferredTextureImageUsageParams params;
+    params.fPreScaleMipLevel = 0;
+    params.fQuality = kNone_SkFilterQuality;
+    DrawDeferredTextureImageData(canvas, &params);
+}
+
+DEF_SIMPLE_GM(deferred_texture_image_low, canvas, 512 + 512 + 30, 512 + 20) {
+    SkImage::DeferredTextureImageUsageParams params;
+    params.fPreScaleMipLevel = 0;
+    params.fQuality = kLow_SkFilterQuality;
+    DrawDeferredTextureImageData(canvas, &params);
+}
+
+DEF_SIMPLE_GM(deferred_texture_image_medium_encoded, canvas, 512 + 512 + 30, 1110) {
+    sk_sp<SkImage> encodedImage = GetResourceAsImage("mandrill_512.png");
+    if (!encodedImage) {
+        SkDebugf("\nCould not load resource.\n");
+        return;
+    }
+
+    SkImage::DeferredTextureImageUsageParams params;
+    params.fMatrix = SkMatrix::MakeScale(0.25f, 0.25f);
+    params.fQuality = kMedium_SkFilterQuality;
+    DrawDeferredTextureImageMipMapTree(canvas, encodedImage.get(), &params);
+}
+
+DEF_SIMPLE_GM(deferred_texture_image_medium_decoded, canvas, 512 + 512 + 30, 1110) {
+    SkBitmap bitmap;
+    if (!GetResourceAsBitmap("mandrill_512.png", &bitmap)) {
+        SkDebugf("\nCould not decode resource.\n");
+        return;
+    }
+    sk_sp<SkImage> decodedImage = SkImage::MakeFromBitmap(bitmap);
+
+    SkImage::DeferredTextureImageUsageParams params;
+    params.fMatrix = SkMatrix::MakeScale(0.25f, 0.25f);
+    params.fQuality = kMedium_SkFilterQuality;
+    DrawDeferredTextureImageMipMapTree(canvas, decodedImage.get(), &params);
+}
+
+DEF_SIMPLE_GM(deferred_texture_image_high, canvas, 512 + 512 + 30, 512 + 20) {
+    SkImage::DeferredTextureImageUsageParams params;
+    params.fPreScaleMipLevel = 0;
+    params.fQuality = kHigh_SkFilterQuality;
+    DrawDeferredTextureImageData(canvas, &params);
+}
+
+#endif