1
2 /*
3 * Copyright 2012 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9 #include "SkBitmap.h"
10 #include "SkBitmapTransformer.h"
11 #include "SkColorPriv.h"
12 #include "SkTypes.h"
13
isValid(bool logReason) const14 bool SkBitmapTransformer::isValid(bool logReason) const {
15 bool retval = true;
16
17 switch(fPixelFormat) {
18 case kARGB_8888_Premul_PixelFormat:
19 break;
20 default:
21 if (logReason) {
22 SkDEBUGF(("PixelFormat %d not supported\n", fPixelFormat));
23 }
24 retval = false;
25 }
26
27 SkBitmap::Config bitmapConfig = fBitmap.config();
28 switch(bitmapConfig) {
29 case SkBitmap::kARGB_8888_Config:
30 break;
31 default:
32 if (logReason) {
33 SkDEBUGF(("SkBitmap::Config %d not supported\n", bitmapConfig));
34 }
35 retval = false;
36 }
37
38 return retval;
39 }
40
41 /**
42 * Transform from kARGB_8888_Config to kARGB_8888_Premul_PixelFormat.
43 *
44 * Similar to the various scanline transformers in
45 * src/images/transform_scanline.h .
46 */
transform_scanline(const char * SK_RESTRICT src,int width,char * SK_RESTRICT dst)47 static void transform_scanline(const char* SK_RESTRICT src, int width,
48 char* SK_RESTRICT dst) {
49 const SkPMColor* SK_RESTRICT srcP = reinterpret_cast<const SkPMColor*>(src);
50 for (int i = 0; i < width; i++) {
51 SkPMColor c = *srcP++;
52 unsigned a = SkGetPackedA32(c);
53 unsigned r = SkGetPackedR32(c);
54 unsigned g = SkGetPackedG32(c);
55 unsigned b = SkGetPackedB32(c);
56 *dst++ = a;
57 *dst++ = r;
58 *dst++ = g;
59 *dst++ = b;
60 }
61 }
62
copyBitmapToPixelBuffer(void * dstBuffer,size_t dstBufferSize) const63 bool SkBitmapTransformer::copyBitmapToPixelBuffer(void *dstBuffer,
64 size_t dstBufferSize) const {
65 if (!this->isValid(true)) {
66 return false;
67 }
68 size_t bytesNeeded = this->bytesNeededTotal();
69 if (dstBufferSize < bytesNeeded) {
70 SkDEBUGF(("dstBufferSize %d must be >= %d\n", dstBufferSize, bytesNeeded));
71 return false;
72 }
73
74 fBitmap.lockPixels();
75 int width = fBitmap.width();
76 size_t srcRowBytes = fBitmap.rowBytes();
77 size_t dstRowBytes = this->bytesNeededPerRow();
78 const char *srcBytes = const_cast<const char *>(static_cast<char*>(fBitmap.getPixels()));
79 char *dstBytes = static_cast<char *>(dstBuffer);
80 for (int y = 0; y < fBitmap.height(); y++) {
81 transform_scanline(srcBytes, width, dstBytes);
82 srcBytes += srcRowBytes;
83 dstBytes += dstRowBytes;
84 }
85 fBitmap.unlockPixels();
86 return true;
87 }
88