1 /* 2 * Copyright 2015 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 #ifndef SkPixmapPriv_DEFINED 9 #define SkPixmapPriv_DEFINED 10 11 #include "SkPixmap.h" 12 #include "SkEncodedOrigin.h" 13 #include "SkAutoPixmapStorage.h" 14 15 class SkPixmapPriv { 16 public: 17 // These flag are applied in this order (swap is applied last) 18 enum OrientFlags { 19 kMirrorX = 1 << 0, 20 kMirrorY = 1 << 1, 21 kSwapXY = 1 << 2, 22 }; 23 24 static OrientFlags OriginToOrient(SkEncodedOrigin); 25 26 /** 27 * Copy the pixels in this pixmap into dst, applying the orientation transformations specified 28 * by the flags. If the inputs are invalid, this returns false and no copy is made. 29 */ 30 static bool Orient(const SkPixmap& dst, const SkPixmap& src, OrientFlags); 31 32 static bool ShouldSwapWidthHeight(SkEncodedOrigin o); 33 static SkImageInfo SwapWidthHeight(const SkImageInfo& info); 34 35 /** 36 * Decode an image and then copy into dst, applying origin. 37 * 38 * @param dst SkPixmap to write the final image, after 39 * applying the origin. 40 * @param origin SkEncodedOrigin to apply to the raw pixels. 41 * @param decode Function for decoding into a pixmap without 42 * applying the origin. 43 */ 44 static bool Orient(const SkPixmap& dst, SkEncodedOrigin origin, 45 std::function<bool(const SkPixmap&)> decode) { 46 SkAutoPixmapStorage storage; 47 const SkPixmap* tmp = &dst; 48 if (origin != kTopLeft_SkEncodedOrigin) { 49 auto info = dst.info(); 50 if (ShouldSwapWidthHeight(origin)) { 51 info = SwapWidthHeight(info); 52 } 53 if (!storage.tryAlloc(info)) { 54 return false; 55 } 56 tmp = &storage; 57 } 58 if (!decode(*tmp)) { 59 return false; 60 } 61 if (tmp != &dst) { 62 return Orient(dst, *tmp, OriginToOrient(origin)); 63 } 64 return true; 65 } 66 67 static void ResetPixmapKeepInfo(SkPixmap* pm, const void* address, size_t rowBytes) { 68 pm->fRowBytes = rowBytes; 69 pm->fPixels = address; 70 } 71 }; 72 73 #endif 74 75
