aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/image/SkSurface.cpp
blob: bb807ba7a555ea3bea979f414a8989ee112967a1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkSurface_Base.h"
#include "SkImagePriv.h"
#include "SkCanvas.h"

#include "SkFontLCDConfig.h"
static SkPixelGeometry compute_default_geometry() {
    SkFontLCDConfig::LCDOrder order = SkFontLCDConfig::GetSubpixelOrder();
    if (SkFontLCDConfig::kNONE_LCDOrder == order) {
        return kUnknown_SkPixelGeometry;
    } else {
        // Bit0 is RGB(0), BGR(1)
        // Bit1 is H(0), V(1)
        const SkPixelGeometry gGeo[] = {
            kRGB_H_SkPixelGeometry,
            kBGR_H_SkPixelGeometry,
            kRGB_V_SkPixelGeometry,
            kBGR_V_SkPixelGeometry,
        };
        int index = 0;
        if (SkFontLCDConfig::kBGR_LCDOrder == order) {
            index |= 1;
        }
        if (SkFontLCDConfig::kVertical_LCDOrientation == SkFontLCDConfig::GetSubpixelOrientation()){
            index |= 2;
        }
        return gGeo[index];
    }
}

SkSurfaceProps::SkSurfaceProps() : fFlags(0), fPixelGeometry(kUnknown_SkPixelGeometry) {}

SkSurfaceProps::SkSurfaceProps(InitType) : fFlags(0), fPixelGeometry(compute_default_geometry()) {}

SkSurfaceProps::SkSurfaceProps(uint32_t flags, InitType)
    : fFlags(flags)
    , fPixelGeometry(compute_default_geometry())
{}

SkSurfaceProps::SkSurfaceProps(uint32_t flags, SkPixelGeometry pg)
    : fFlags(flags), fPixelGeometry(pg)
{}

SkSurfaceProps::SkSurfaceProps(const SkSurfaceProps& other)
    : fFlags(other.fFlags)
    , fPixelGeometry(other.fPixelGeometry)
{}

///////////////////////////////////////////////////////////////////////////////

SkSurface_Base::SkSurface_Base(int width, int height, const SkSurfaceProps* props)
    : INHERITED(width, height, props)
{
    fCachedCanvas = nullptr;
    fCachedImage = nullptr;
}

SkSurface_Base::SkSurface_Base(const SkImageInfo& info, const SkSurfaceProps* props)
    : INHERITED(info, props)
{
    fCachedCanvas = nullptr;
    fCachedImage = nullptr;
}

SkSurface_Base::~SkSurface_Base() {
    // in case the canvas outsurvives us, we null the callback
    if (fCachedCanvas) {
        fCachedCanvas->setSurfaceBase(nullptr);
    }

    SkSafeUnref(fCachedImage);
    SkSafeUnref(fCachedCanvas);
}

void SkSurface_Base::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
    auto image = this->makeImageSnapshot(SkBudgeted::kYes);
    if (image) {
        canvas->drawImage(image, x, y, paint);
    }
}

bool SkSurface_Base::outstandingImageSnapshot() const {
    return fCachedImage && !fCachedImage->unique();
}

void SkSurface_Base::aboutToDraw(ContentChangeMode mode) {
    this->dirtyGenerationID();

    SkASSERT(!fCachedCanvas || fCachedCanvas->getSurfaceBase() == this);

    if (fCachedImage) {
        // the surface may need to fork its backend, if its sharing it with
        // the cached image. Note: we only call if there is an outstanding owner
        // on the image (besides us).
        bool unique = fCachedImage->unique();
        if (!unique) {
            this->onCopyOnWrite(mode);
        }

        // regardless of copy-on-write, we must drop our cached image now, so
        // that the next request will get our new contents.
        fCachedImage->unref();
        fCachedImage = nullptr;

        if (unique) {
            // Our content isn't held by any image now, so we can consider that content mutable.
            // Raster surfaces need to be told it's safe to consider its pixels mutable again.
            // We make this call after the ->unref() so the subclass can assert there are no images.
            this->onRestoreBackingMutability();
        }
    } else if (kDiscard_ContentChangeMode == mode) {
        this->onDiscard();
    }
}

uint32_t SkSurface_Base::newGenerationID() {
    SkASSERT(!fCachedCanvas || fCachedCanvas->getSurfaceBase() == this);
    static int32_t gID;
    return sk_atomic_inc(&gID) + 1;
}

static SkSurface_Base* asSB(SkSurface* surface) {
    return static_cast<SkSurface_Base*>(surface);
}

///////////////////////////////////////////////////////////////////////////////

SkSurface::SkSurface(int width, int height, const SkSurfaceProps* props)
    : fProps(SkSurfacePropsCopyOrDefault(props)), fWidth(width), fHeight(height)
{
    SkASSERT(fWidth > 0);
    SkASSERT(fHeight > 0);
    fGenerationID = 0;
}

SkSurface::SkSurface(const SkImageInfo& info, const SkSurfaceProps* props)
    : fProps(SkSurfacePropsCopyOrDefault(props)), fWidth(info.width()), fHeight(info.height())
{
    SkASSERT(fWidth > 0);
    SkASSERT(fHeight > 0);
    fGenerationID = 0;
}

uint32_t SkSurface::generationID() {
    if (0 == fGenerationID) {
        fGenerationID = asSB(this)->newGenerationID();
    }
    return fGenerationID;
}

void SkSurface::notifyContentWillChange(ContentChangeMode mode) {
    asSB(this)->aboutToDraw(mode);
}

SkCanvas* SkSurface::getCanvas() {
    return asSB(this)->getCachedCanvas();
}

sk_sp<SkImage> SkSurface::makeImageSnapshot(SkBudgeted budgeted) {
    // the caller will call unref() to balance this
    return asSB(this)->refCachedImage(budgeted, kNo_ForceUnique);
}

sk_sp<SkImage> SkSurface::makeImageSnapshot(SkBudgeted budgeted, ForceUnique unique) {
    // the caller will call unref() to balance this
    return asSB(this)->refCachedImage(budgeted, unique);
}

SkSurface* SkSurface::newSurface(const SkImageInfo& info) {
    return asSB(this)->onNewSurface(info);
}

void SkSurface::draw(SkCanvas* canvas, SkScalar x, SkScalar y,
                     const SkPaint* paint) {
    return asSB(this)->onDraw(canvas, x, y, paint);
}

bool SkSurface::peekPixels(SkPixmap* pmap) {
    return this->getCanvas()->peekPixels(pmap);
}

#ifdef SK_SUPPORT_LEGACY_PEEKPIXELS_PARMS
const void* SkSurface::peekPixels(SkImageInfo* info, size_t* rowBytes) {
    SkPixmap pm;
    if (this->peekPixels(&pm)) {
        if (info) {
            *info = pm.info();
        }
        if (rowBytes) {
            *rowBytes = pm.rowBytes();
        }
        return pm.addr();
    }
    return nullptr;
}
#endif

bool SkSurface::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
                           int srcX, int srcY) {
    return this->getCanvas()->readPixels(dstInfo, dstPixels, dstRowBytes, srcX, srcY);
}

GrBackendObject SkSurface::getTextureHandle(BackendHandleAccess access) {
    return asSB(this)->onGetTextureHandle(access);
}

bool SkSurface::getRenderTargetHandle(GrBackendObject* obj, BackendHandleAccess access) {
    return asSB(this)->onGetRenderTargetHandle(obj, access);
}

void SkSurface::prepareForExternalIO() {
  asSB(this)->onPrepareForExternalIO();
}

//////////////////////////////////////////////////////////////////////////////////////

#if !SK_SUPPORT_GPU

SkSurface* SkSurface::NewRenderTargetDirect(GrRenderTarget*, const SkSurfaceProps*) {
    return nullptr;
}

SkSurface* SkSurface::NewRenderTarget(GrContext*, SkBudgeted, const SkImageInfo&, int,
                                      const SkSurfaceProps*, GrTextureStorageAllocator) {
    return nullptr;
}

SkSurface* SkSurface::NewFromBackendTexture(GrContext*, const GrBackendTextureDesc&,
                                             const SkSurfaceProps*) {
    return nullptr;
}

SkSurface* SkSurface::NewFromBackendRenderTarget(GrContext*, const GrBackendRenderTargetDesc&,
                                                 const SkSurfaceProps*) {
    return nullptr;
}

SkSurface* NewFromBackendTextureAsRenderTarget(GrContext*, const GrBackendTextureDesc&,
                                               const SkSurfaceProps*) {
    return nullptr;
}

#endif