aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/gpu/GrAtlas.cpp
blob: f8586fa0e308f6a3dda5434dbf9651904ddacf57 (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

/*
 * Copyright 2010 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */



#include "GrAtlas.h"
#include "GrContext.h"
#include "GrGpu.h"
#include "GrRectanizer.h"
#include "GrPlotMgr.h"

#if 0
#define GR_PLOT_WIDTH   8
#define GR_PLOT_HEIGHT  4
#define GR_ATLAS_WIDTH  256
#define GR_ATLAS_HEIGHT 256

#define GR_ATLAS_TEXTURE_WIDTH  (GR_PLOT_WIDTH * GR_ATLAS_WIDTH)
#define GR_ATLAS_TEXTURE_HEIGHT (GR_PLOT_HEIGHT * GR_ATLAS_HEIGHT)

#else

#define GR_ATLAS_TEXTURE_WIDTH  1024
#define GR_ATLAS_TEXTURE_HEIGHT 2048

#define GR_ATLAS_WIDTH  341
#define GR_ATLAS_HEIGHT 341

#define GR_PLOT_WIDTH   (GR_ATLAS_TEXTURE_WIDTH / GR_ATLAS_WIDTH)
#define GR_PLOT_HEIGHT  (GR_ATLAS_TEXTURE_HEIGHT / GR_ATLAS_HEIGHT)

#endif

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

#define BORDER      1

#if GR_DEBUG
    static int gCounter;
#endif

GrAtlas::GrAtlas(GrAtlasMgr* mgr, int plotX, int plotY, GrMaskFormat format) {
    fAtlasMgr = mgr;    // just a pointer, not an owner
    fNext = NULL;
    fTexture = mgr->getTexture(format); // we're not an owner, just a pointer
    fPlot.set(plotX, plotY);

    fRects = GrRectanizer::Factory(GR_ATLAS_WIDTH - BORDER,
                                   GR_ATLAS_HEIGHT - BORDER);

    fMaskFormat = format;

#if GR_DEBUG
//    GrPrintf(" GrAtlas %p [%d %d] %d\n", this, plotX, plotY, gCounter);
    gCounter += 1;
#endif
}

GrAtlas::~GrAtlas() {
    fAtlasMgr->freePlot(fPlot.fX, fPlot.fY);

    delete fRects;

#if GR_DEBUG
    --gCounter;
//    GrPrintf("~GrAtlas %p [%d %d] %d\n", this, fPlot.fX, fPlot.fY, gCounter);
#endif
}

static void adjustForPlot(GrIPoint16* loc, const GrIPoint16& plot) {
    loc->fX += plot.fX * GR_ATLAS_WIDTH;
    loc->fY += plot.fY * GR_ATLAS_HEIGHT;
}

static uint8_t* zerofill(uint8_t* ptr, int count) {
    while (--count >= 0) {
        *ptr++ = 0;
    }
    return ptr;
}

bool GrAtlas::addSubImage(int width, int height, const void* image,
                          GrIPoint16* loc) {
    if (!fRects->addRect(width + BORDER, height + BORDER, loc)) {
        return false;
    }

    SkAutoSMalloc<1024> storage;
    int dstW = width + 2*BORDER;
    int dstH = height + 2*BORDER;
    if (BORDER) {
        const int bpp = GrMaskFormatBytesPerPixel(fMaskFormat);
        const size_t dstRB = dstW * bpp;
        uint8_t* dst = (uint8_t*)storage.reset(dstH * dstRB);
        Gr_bzero(dst, dstRB);                // zero top row
        dst += dstRB;
        for (int y = 0; y < height; y++) {
            dst = zerofill(dst, bpp);   // zero left edge
            memcpy(dst, image, width * bpp);
            dst += width * bpp;
            dst = zerofill(dst, bpp);   // zero right edge
            image = (const void*)((const char*)image + width * bpp);
        }
        Gr_bzero(dst, dstRB);                // zero bottom row
        image = storage.get();
    }
    adjustForPlot(loc, fPlot);
    GrContext* context = fTexture->getContext();
    // We call the internal version so that we don't force a flush. We assume
    // our caller is smart and hasn't referenced the part of the texture we're
    // about to update since the last flush.
    context->internalWriteTexturePixels(fTexture, loc->fX, loc->fY,
                                        dstW, dstH, fTexture->config(),
                                        image, 0,
                                        GrContext::kDontFlush_PixelOpsFlag);

    // now tell the caller to skip the top/left BORDER
    loc->fX += BORDER;
    loc->fY += BORDER;
    return true;
}

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

GrAtlasMgr::GrAtlasMgr(GrGpu* gpu) {
    fGpu = gpu;
    gpu->ref();
    Gr_bzero(fTexture, sizeof(fTexture));
    fPlotMgr = new GrPlotMgr(GR_PLOT_WIDTH, GR_PLOT_HEIGHT);
}

GrAtlasMgr::~GrAtlasMgr() {
    for (size_t i = 0; i < GR_ARRAY_COUNT(fTexture); i++) {
        GrSafeUnref(fTexture[i]);
    }
    delete fPlotMgr;
    fGpu->unref();
}

static GrPixelConfig maskformat2pixelconfig(GrMaskFormat format) {
    switch (format) {
        case kA8_GrMaskFormat:
            return kAlpha_8_GrPixelConfig;
        case kA565_GrMaskFormat:
            return kRGB_565_GrPixelConfig;
        case kA888_GrMaskFormat:
            return kSkia8888_PM_GrPixelConfig;
        default:
            GrAssert(!"unknown maskformat");
    }
    return kUnknown_GrPixelConfig;
}

GrAtlas* GrAtlasMgr::addToAtlas(GrAtlas* atlas,
                                int width, int height, const void* image,
                                GrMaskFormat format,
                                GrIPoint16* loc) {
    GrAssert(NULL == atlas || atlas->getMaskFormat() == format);

    if (atlas && atlas->addSubImage(width, height, image, loc)) {
        return atlas;
    }

    // If the above fails, then either we have no starting atlas, or the current
    // one is full. Either way we need to allocate a new atlas

    GrIPoint16 plot;
    if (!fPlotMgr->newPlot(&plot)) {
        return NULL;
    }

    GrAssert(0 == kA8_GrMaskFormat);
    GrAssert(1 == kA565_GrMaskFormat);
    if (NULL == fTexture[format]) {
        GrTextureDesc desc = {
            kDynamicUpdate_GrTextureFlagBit,
            GR_ATLAS_TEXTURE_WIDTH,
            GR_ATLAS_TEXTURE_HEIGHT,
            maskformat2pixelconfig(format),
            0 // samples
        };
        fTexture[format] = fGpu->createTexture(desc, NULL, 0);
        if (NULL == fTexture[format]) {
            return NULL;
        }
    }

    GrAtlas* newAtlas = new GrAtlas(this, plot.fX, plot.fY, format);
    if (!newAtlas->addSubImage(width, height, image, loc)) {
        delete newAtlas;
        return NULL;
    }

    newAtlas->fNext = atlas;
    return newAtlas;
}

void GrAtlasMgr::freePlot(int x, int y) {
    GrAssert(fPlotMgr->isBusy(x, y));
    fPlotMgr->freePlot(x, y);
}