1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10#include "GrRenderTarget.h"
11
12#include "GrContext.h"
13#include "GrGpu.h"
14#include "GrStencilBuffer.h"
15
16bool GrRenderTarget::readPixels(int left, int top, int width, int height,
17                                GrPixelConfig config, void* buffer,
18                                size_t rowBytes) {
19    // go through context so that all necessary flushing occurs
20    GrContext* context = this->getContext();
21    if (NULL == context) {
22        return false;
23    }
24    return context->readRenderTargetPixels(this,
25                                           left, top,
26                                           width, height,
27                                           config, buffer, rowBytes);
28}
29
30void GrRenderTarget::writePixels(int left, int top, int width, int height,
31                                 GrPixelConfig config, const void* buffer,
32                                 size_t rowBytes) {
33    // go through context so that all necessary flushing occurs
34    GrContext* context = this->getContext();
35    if (NULL == context) {
36        return;
37    }
38    context->writeRenderTargetPixels(this,
39                                     left, top,
40                                     width, height,
41                                     config, buffer, rowBytes);
42}
43
44void GrRenderTarget::resolve() {
45    // go through context so that all necessary flushing occurs
46    GrContext* context = this->getContext();
47    if (NULL == context) {
48        return;
49    }
50    context->resolveRenderTarget(this);
51}
52
53size_t GrRenderTarget::sizeInBytes() const {
54    int colorBits;
55    if (kUnknown_GrPixelConfig == fConfig) {
56        colorBits = 32; // don't know, make a guess
57    } else {
58        colorBits = GrBytesPerPixel(fConfig);
59    }
60    uint64_t size = fWidth;
61    size *= fHeight;
62    size *= colorBits;
63    size *= GrMax(1,fSampleCnt);
64    return (size_t)(size / 8);
65}
66
67void GrRenderTarget::flagAsNeedingResolve(const GrIRect* rect) {
68    if (kCanResolve_ResolveType == getResolveType()) {
69        if (NULL != rect) {
70            fResolveRect.join(*rect);
71            if (!fResolveRect.intersect(0, 0, this->width(), this->height())) {
72                fResolveRect.setEmpty();
73            }
74        } else {
75            fResolveRect.setLTRB(0, 0, this->width(), this->height());
76        }
77    }
78}
79
80void GrRenderTarget::overrideResolveRect(const GrIRect rect) {
81    fResolveRect = rect;
82    if (fResolveRect.isEmpty()) {
83        fResolveRect.setLargestInverted();
84    } else {
85        if (!fResolveRect.intersect(0, 0, this->width(), this->height())) {
86            fResolveRect.setLargestInverted();
87        }
88    }
89}
90
91void GrRenderTarget::setStencilBuffer(GrStencilBuffer* stencilBuffer) {
92    if (NULL != fStencilBuffer) {
93        fStencilBuffer->wasDetachedFromRenderTarget(this);
94        fStencilBuffer->unref();
95    }
96    fStencilBuffer = stencilBuffer;
97    if (NULL != fStencilBuffer) {
98        fStencilBuffer->wasAttachedToRenderTarget(this);
99        fStencilBuffer->ref();
100    }
101}
102