GrTextureRenderTargetProxy.cpp revision c4f0a8245ccf0d14f6a6dffc73ff56b563012b69 
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#include "GrTextureRenderTargetProxy.h"
9
10// Deferred version
11// This class is virtually derived from GrSurfaceProxy (via both GrTextureProxy and
12// GrRenderTargetProxy) so its constructor must be explicitly called.
13GrTextureRenderTargetProxy::GrTextureRenderTargetProxy(const GrCaps& caps,
14                                                       const GrSurfaceDesc& desc,
15                                                       SkBackingFit fit,
16                                                       SkBudgeted budgeted,
17                                                       uint32_t flags)
18    : GrSurfaceProxy(desc, fit, budgeted, flags)
19    // for now textures w/ data are always wrapped
20    , GrTextureProxy(desc, fit, budgeted, nullptr, 0, flags)
21    , GrRenderTargetProxy(caps, desc, fit, budgeted, flags) {
22}
23
24// Wrapped version
25// This class is virtually derived from GrSurfaceProxy (via both GrTextureProxy and
26// GrRenderTargetProxy) so its constructor must be explicitly called.
27GrTextureRenderTargetProxy::GrTextureRenderTargetProxy(sk_sp<GrSurface> surf)
28    : GrSurfaceProxy(surf, SkBackingFit::kExact)
29    , GrTextureProxy(surf)
30    , GrRenderTargetProxy(surf) {
31    SkASSERT(surf->asTexture());
32    SkASSERT(surf->asRenderTarget());
33}
34
35size_t GrTextureRenderTargetProxy::onUninstantiatedGpuMemorySize() const {
36    int colorSamplesPerPixel = this->numColorSamples() + 1;
37
38    static const bool kHasMipMaps = true;
39    // TODO: add tracking of mipmap state to improve the estimate. We track whether we are created
40    // with mip maps but not whether a texture read from the proxy will lazily generate mip maps.
41
42    // TODO: do we have enough information to improve this worst case estimate?
43    return GrSurface::ComputeSize(fConfig, fWidth, fHeight, colorSamplesPerPixel, kHasMipMaps,
44                                  SkBackingFit::kApprox == fFit);
45}
46
47bool GrTextureRenderTargetProxy::instantiate(GrResourceProvider* resourceProvider) {
48    static constexpr GrSurfaceFlags kFlags = kRenderTarget_GrSurfaceFlag;
49
50    if (!this->instantiateImpl(resourceProvider, this->numStencilSamples(), kFlags,
51                               this->isMipMapped(), this->mipColorMode())) {
52        return false;
53    }
54    SkASSERT(fTarget->asRenderTarget());
55    SkASSERT(fTarget->asTexture());
56
57    return true;
58}
59