bitmap.cpp revision f4faeac3525fe1ce3707ab785a1651aec367589d 
1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <android/bitmap.h>
18
19#pragma GCC diagnostic push
20#pragma GCC diagnostic ignored "-Wunused-parameter"
21#include <GraphicsJNI.h>
22#pragma GCC diagnostic pop
23
24int AndroidBitmap_getInfo(JNIEnv* env, jobject jbitmap,
25                          AndroidBitmapInfo* info) {
26    if (NULL == env || NULL == jbitmap) {
27        return ANDROID_BITMAP_RESULT_BAD_PARAMETER;
28    }
29
30    SkBitmap* bm = GraphicsJNI::getSkBitmap(env, jbitmap);
31    if (NULL == bm) {
32        return ANDROID_BITMAP_RESULT_JNI_EXCEPTION;
33    }
34
35    if (info) {
36        info->width     = bm->width();
37        info->height    = bm->height();
38        info->stride    = bm->rowBytes();
39        info->flags     = 0;
40
41        switch (bm->colorType()) {
42            case kN32_SkColorType:
43                info->format = ANDROID_BITMAP_FORMAT_RGBA_8888;
44                break;
45            case kRGB_565_SkColorType:
46                info->format = ANDROID_BITMAP_FORMAT_RGB_565;
47                break;
48            case kARGB_4444_SkColorType:
49                info->format = ANDROID_BITMAP_FORMAT_RGBA_4444;
50                break;
51            case kAlpha_8_SkColorType:
52                info->format = ANDROID_BITMAP_FORMAT_A_8;
53                break;
54            default:
55                info->format = ANDROID_BITMAP_FORMAT_NONE;
56                break;
57        }
58    }
59    return ANDROID_BITMAP_RESULT_SUCCESS;
60}
61
62int AndroidBitmap_lockPixels(JNIEnv* env, jobject jbitmap, void** addrPtr) {
63    if (NULL == env || NULL == jbitmap) {
64        return ANDROID_BITMAP_RESULT_BAD_PARAMETER;
65    }
66
67    SkBitmap* bm = GraphicsJNI::getSkBitmap(env, jbitmap);
68    if (NULL == bm) {
69        return ANDROID_BITMAP_RESULT_JNI_EXCEPTION;
70    }
71
72    bm->lockPixels();
73    void* addr = bm->getPixels();
74    if (NULL == addr) {
75        bm->unlockPixels();
76        return ANDROID_BITMAP_RESULT_ALLOCATION_FAILED;
77    }
78
79    if (addrPtr) {
80        *addrPtr = addr;
81    }
82    return ANDROID_BITMAP_RESULT_SUCCESS;
83}
84
85int AndroidBitmap_unlockPixels(JNIEnv* env, jobject jbitmap) {
86    if (NULL == env || NULL == jbitmap) {
87        return ANDROID_BITMAP_RESULT_BAD_PARAMETER;
88    }
89
90    SkBitmap* bm = GraphicsJNI::getSkBitmap(env, jbitmap);
91    if (NULL == bm) {
92        return ANDROID_BITMAP_RESULT_JNI_EXCEPTION;
93    }
94
95    // notifyPixelsChanged() needs be called to apply writes to GL-backed
96    // bitmaps.  Note that this will slow down read-only accesses to the
97    // bitmaps, but the NDK methods are primarily intended to be used for
98    // writes.
99    bm->notifyPixelsChanged();
100
101    bm->unlockPixels();
102    return ANDROID_BITMAP_RESULT_SUCCESS;
103}
104
105