SkImageGenerator.cpp revision 518d83dbc1c899e316e8c896af5defb58b83120f 
1/*
2 * Copyright 2014 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 "SkImageGenerator.h"
9
10#ifndef SK_SUPPORT_LEGACY_IMAGEGENERATORAPI
11bool SkImageGenerator::getInfo(SkImageInfo* info) {
12    SkImageInfo dummy;
13    if (NULL == info) {
14        info = &dummy;
15    }
16    return this->onGetInfo(info);
17}
18
19bool SkImageGenerator::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
20                                 SkPMColor ctable[], int* ctableCount) {
21    if (kUnknown_SkColorType == info.colorType()) {
22        return false;
23    }
24    if (NULL == pixels) {
25        return false;
26    }
27    if (rowBytes < info.minRowBytes()) {
28        return false;
29    }
30
31    if (kIndex_8_SkColorType == info.colorType()) {
32        if (NULL == ctable || NULL == ctableCount) {
33            return false;
34        }
35    } else {
36        if (ctableCount) {
37            *ctableCount = 0;
38        }
39        ctableCount = NULL;
40        ctable = NULL;
41    }
42
43    bool success = this->onGetPixels(info, pixels, rowBytes, ctable, ctableCount);
44
45    if (success && ctableCount) {
46        SkASSERT(*ctableCount >= 0 && *ctableCount <= 256);
47    }
48    return success;
49}
50
51bool SkImageGenerator::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes) {
52    SkASSERT(kIndex_8_SkColorType != info.colorType());
53    if (kIndex_8_SkColorType == info.colorType()) {
54        return false;
55    }
56    return this->getPixels(info, pixels, rowBytes, NULL, NULL);
57}
58#endif
59
60bool SkImageGenerator::getYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]) {
61#ifdef SK_DEBUG
62    // In all cases, we need the sizes array
63    SkASSERT(NULL != sizes);
64
65    bool isValidWithPlanes = (NULL != planes) && (NULL != rowBytes) &&
66        ((NULL != planes[0]) && (NULL != planes[1]) && (NULL != planes[2]) &&
67         (0  != rowBytes[0]) && (0  != rowBytes[1]) && (0  != rowBytes[2]));
68    bool isValidWithoutPlanes =
69        ((NULL == planes) ||
70         ((NULL == planes[0]) && (NULL == planes[1]) && (NULL == planes[2]))) &&
71        ((NULL == rowBytes) ||
72         ((0 == rowBytes[0]) && (0 == rowBytes[1]) && (0 == rowBytes[2])));
73
74    // Either we have all planes and rowBytes information or we have none of it
75    // Having only partial information is not supported
76    SkASSERT(isValidWithPlanes || isValidWithoutPlanes);
77
78    // If we do have planes information, make sure all sizes are non 0
79    // and all rowBytes are valid
80    SkASSERT(!isValidWithPlanes ||
81             ((sizes[0].fWidth  >= 0) &&
82              (sizes[0].fHeight >= 0) &&
83              (sizes[1].fWidth  >= 0) &&
84              (sizes[1].fHeight >= 0) &&
85              (sizes[2].fWidth  >= 0) &&
86              (sizes[2].fHeight >= 0) &&
87              (rowBytes[0] >= (size_t)sizes[0].fWidth) &&
88              (rowBytes[1] >= (size_t)sizes[1].fWidth) &&
89              (rowBytes[2] >= (size_t)sizes[2].fWidth)));
90#endif
91
92    return this->onGetYUV8Planes(sizes, planes, rowBytes);
93}
94
95bool SkImageGenerator::onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]) {
96    return false;
97}
98
99/////////////////////////////////////////////////////////////////////////////////////////////
100
101SkData* SkImageGenerator::onRefEncodedData() {
102    return NULL;
103}
104
105bool SkImageGenerator::onGetInfo(SkImageInfo*) {
106    return false;
107}
108
109bool SkImageGenerator::onGetPixels(const SkImageInfo&, void*, size_t, SkPMColor*, int*) {
110    return false;
111}
112