aboutsummaryrefslogtreecommitdiffhomepage
path: root/include/gpu/GrTexture.h
blob: 047bd18186ef3b135cef6782a821df1bfa49661a (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

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef GrTexture_DEFINED
#define GrTexture_DEFINED

#include "GrSurface.h"
#include "SkPoint.h"
#include "GrRenderTarget.h"

class GrResourceKey;
class GrTextureParams;
class GrTextureImpl;

class GrTexture : public GrSurface {
public:
    /**
     *  Approximate number of bytes used by the texture
     */
    virtual size_t gpuMemorySize() const SK_OVERRIDE;

    // GrSurface overrides
    virtual bool readPixels(int left, int top, int width, int height,
                            GrPixelConfig config,
                            void* buffer,
                            size_t rowBytes = 0,
                            uint32_t pixelOpsFlags = 0) SK_OVERRIDE;

    virtual void writePixels(int left, int top, int width, int height,
                             GrPixelConfig config,
                             const void* buffer,
                             size_t rowBytes = 0,
                             uint32_t pixelOpsFlags = 0) SK_OVERRIDE;

    virtual GrTexture* asTexture() SK_OVERRIDE { return this; }
    virtual const GrTexture* asTexture() const SK_OVERRIDE { return this; }
    virtual GrRenderTarget* asRenderTarget() SK_OVERRIDE { return fRenderTarget.get(); }
    virtual const GrRenderTarget* asRenderTarget() const SK_OVERRIDE { return fRenderTarget.get(); }

    /**
     * Convert from texels to normalized texture coords for POT textures only. Please don't add
     * new callsites for these functions. They are slated for removal.
     */
    SkFixed normalizeFixedX(SkFixed x) const {
        SkASSERT(SkIsPow2(fDesc.fWidth));
        return x >> fShiftFixedX;
    }
    SkFixed normalizeFixedY(SkFixed y) const {
        SkASSERT(SkIsPow2(fDesc.fHeight));
        return y >> fShiftFixedY;
    }

    /**
     *  Return the native ID or handle to the texture, depending on the
     *  platform. e.g. on OpenGL, return the texture ID.
     */
    virtual GrBackendObject getTextureHandle() const = 0;

    /**
     * This function indicates that the texture parameters (wrap mode, filtering, ...) have been
     * changed externally to Skia.
     */
    virtual void textureParamsModified() = 0;
    SK_ATTR_DEPRECATED("Renamed to textureParamsModified.")
    void invalidateCachedState() { this->textureParamsModified(); }

    /**
     * Informational texture flags. This will be moved to the private GrTextureImpl class soon.
     */
    enum FlagBits {
        kFirstBit = (kLastPublic_GrTextureFlagBit << 1),

        /**
         * This texture should be returned to the texture cache when
         * it is no longer reffed
         */
        kReturnToCache_FlagBit        = kFirstBit,
    };

    void resetFlag(GrTextureFlags flags) {
        fDesc.fFlags = fDesc.fFlags & ~flags;
    }

#ifdef SK_DEBUG
    void validate() const {
        this->INHERITED::validate();

        this->validateDesc();
    }
#endif

    GrTextureImpl* impl() { return reinterpret_cast<GrTextureImpl*>(this); }
    const GrTextureImpl* impl() const { return reinterpret_cast<const GrTextureImpl*>(this); }

protected:
    // A texture refs its rt representation but not vice-versa. It is up to
    // the subclass constructor to initialize this pointer.
    SkAutoTUnref<GrRenderTarget> fRenderTarget;

    GrTexture(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc)
    : INHERITED(gpu, isWrapped, desc)
    , fRenderTarget(NULL) {
        // only make sense if alloc size is pow2
        fShiftFixedX = 31 - SkCLZ(fDesc.fWidth);
        fShiftFixedY = 31 - SkCLZ(fDesc.fHeight);
    }

    virtual ~GrTexture();

    // GrResource overrides
    virtual void onRelease() SK_OVERRIDE;
    virtual void onAbandon() SK_OVERRIDE;

    void validateDesc() const;

private:
    virtual void internal_dispose() const SK_OVERRIDE;

    // these two shift a fixed-point value into normalized coordinates
    // for this texture if the texture is power of two sized.
    int                 fShiftFixedX;
    int                 fShiftFixedY;

    typedef GrSurface INHERITED;
};

class GrTextureImpl : public GrTexture {
public:
    SK_DECLARE_INST_COUNT(GrTextureImpl)

    void setFlag(GrTextureFlags flags) {
        fDesc.fFlags = fDesc.fFlags | flags;
    }
    void resetFlag(GrTextureFlags flags) {
        fDesc.fFlags = fDesc.fFlags & ~flags;
    }
    bool isSetFlag(GrTextureFlags flags) const {
        return 0 != (fDesc.fFlags & flags);
    }

    void dirtyMipMaps(bool mipMapsDirty);

    bool mipMapsAreDirty() const {
        return kValid_MipMapsStatus != fMipMapsStatus;
    }

    bool hasMipMaps() const {
        return kNotAllocated_MipMapsStatus != fMipMapsStatus;
    }

    static GrResourceKey ComputeKey(const GrGpu* gpu,
                                    const GrTextureParams* params,
                                    const GrTextureDesc& desc,
                                    const GrCacheID& cacheID);
    static GrResourceKey ComputeScratchKey(const GrTextureDesc& desc);
    static bool NeedsResizing(const GrResourceKey& key);
    static bool NeedsBilerp(const GrResourceKey& key);

protected:
    GrTextureImpl(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc)
    : INHERITED(gpu, isWrapped, desc)
    , fMipMapsStatus(kNotAllocated_MipMapsStatus) {
    }

private:
    enum MipMapsStatus {
        kNotAllocated_MipMapsStatus,
        kAllocated_MipMapsStatus,
        kValid_MipMapsStatus
    };

    MipMapsStatus       fMipMapsStatus;

    typedef GrTexture INHERITED;
};

/**
 * Represents a texture that is intended to be accessed in device coords with an offset.
 */
class GrDeviceCoordTexture {
public:
    GrDeviceCoordTexture() { fOffset.set(0, 0); }

    GrDeviceCoordTexture(const GrDeviceCoordTexture& other) {
        *this = other;
    }

    GrDeviceCoordTexture(GrTexture* texture, const SkIPoint& offset)
        : fTexture(SkSafeRef(texture))
        , fOffset(offset) {
    }

    GrDeviceCoordTexture& operator=(const GrDeviceCoordTexture& other) {
        fTexture.reset(SkSafeRef(other.fTexture.get()));
        fOffset = other.fOffset;
        return *this;
    }

    const SkIPoint& offset() const { return fOffset; }

    void setOffset(const SkIPoint& offset) { fOffset = offset; }
    void setOffset(int ox, int oy) { fOffset.set(ox, oy); }

    GrTexture* texture() const { return fTexture.get(); }

    GrTexture* setTexture(GrTexture* texture) {
        fTexture.reset(SkSafeRef(texture));
        return texture;
    }

private:
    SkAutoTUnref<GrTexture> fTexture;
    SkIPoint                fOffset;
};

#endif