Home | History | Annotate | Download | only in core 
      1 /*
      2  * Copyright 2006 The Android Open Source Project
      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 "SkSpriteBlitter.h"
      9 #include "SkArenaAlloc.h"
     10 #include "SkBlitRow.h"
     11 #include "SkColorFilter.h"
     12 #include "SkColorPriv.h"
     13 #include "SkTemplates.h"
     14 #include "SkUtils.h"
     15 #include "SkXfermodePriv.h"
     16 
     17 ///////////////////////////////////////////////////////////////////////////////
     18 
     19 class Sprite_D32_S32 : public SkSpriteBlitter {
     20 public:
     21     Sprite_D32_S32(const SkPixmap& src, U8CPU alpha)  : INHERITED(src) {
     22         SkASSERT(src.colorType() == kN32_SkColorType);
     23 
     24         unsigned flags32 = 0;
     25         if (255 != alpha) {
     26             flags32 |= SkBlitRow::kGlobalAlpha_Flag32;
     27         }
     28         if (!src.isOpaque()) {
     29             flags32 |= SkBlitRow::kSrcPixelAlpha_Flag32;
     30         }
     31 
     32         fProc32 = SkBlitRow::Factory32(flags32);
     33         fAlpha = alpha;
     34     }
     35 
     36     void blitRect(int x, int y, int width, int height) override {
     37         SkASSERT(width > 0 && height > 0);
     38         uint32_t* SK_RESTRICT dst = fDst.writable_addr32(x, y);
     39         const uint32_t* SK_RESTRICT src = fSource.addr32(x - fLeft, y - fTop);
     40         size_t dstRB = fDst.rowBytes();
     41         size_t srcRB = fSource.rowBytes();
     42         SkBlitRow::Proc32 proc = fProc32;
     43         U8CPU             alpha = fAlpha;
     44 
     45         do {
     46             proc(dst, src, width, alpha);
     47             dst = (uint32_t* SK_RESTRICT)((char*)dst + dstRB);
     48             src = (const uint32_t* SK_RESTRICT)((const char*)src + srcRB);
     49         } while (--height != 0);
     50     }
     51 
     52 private:
     53     SkBlitRow::Proc32   fProc32;
     54     U8CPU               fAlpha;
     55 
     56     typedef SkSpriteBlitter INHERITED;
     57 };
     58 
     59 ///////////////////////////////////////////////////////////////////////////////
     60 
     61 class Sprite_D32_S32A_Xfer: public SkSpriteBlitter {
     62 public:
     63     Sprite_D32_S32A_Xfer(const SkPixmap& source, const SkPaint& paint) : SkSpriteBlitter(source) {
     64         fXfermode = SkXfermode::Peek(paint.getBlendMode());
     65         SkASSERT(fXfermode);
     66     }
     67 
     68     void blitRect(int x, int y, int width, int height) override {
     69         SkASSERT(width > 0 && height > 0);
     70         uint32_t* SK_RESTRICT dst = fDst.writable_addr32(x, y);
     71         const uint32_t* SK_RESTRICT src = fSource.addr32(x - fLeft, y - fTop);
     72         size_t dstRB = fDst.rowBytes();
     73         size_t srcRB = fSource.rowBytes();
     74         SkXfermode* xfermode = fXfermode;
     75 
     76         do {
     77             xfermode->xfer32(dst, src, width, nullptr);
     78 
     79             dst = (uint32_t* SK_RESTRICT)((char*)dst + dstRB);
     80             src = (const uint32_t* SK_RESTRICT)((const char*)src + srcRB);
     81         } while (--height != 0);
     82     }
     83 
     84 protected:
     85     SkXfermode* fXfermode;
     86 
     87 private:
     88     typedef SkSpriteBlitter INHERITED;
     89 };
     90 
     91 ///////////////////////////////////////////////////////////////////////////////
     92 
     93 SkSpriteBlitter* SkSpriteBlitter::ChooseL32(const SkPixmap& source, const SkPaint& paint,
     94                                             SkArenaAlloc* allocator) {
     95     SkASSERT(allocator != nullptr);
     96 
     97     if (paint.getColorFilter() != nullptr) {
     98         return nullptr;
     99     }
    100     if (paint.getMaskFilter() != nullptr) {
    101         return nullptr;
    102     }
    103 
    104     U8CPU alpha = paint.getAlpha();
    105 
    106     if (source.colorType() == kN32_SkColorType) {
    107         if (paint.isSrcOver()) {
    108             // this can handle alpha, but not xfermode
    109             return allocator->make<Sprite_D32_S32>(source, alpha);
    110         }
    111         if (255 == alpha) {
    112             // this can handle an xfermode, but not alpha
    113             return allocator->make<Sprite_D32_S32A_Xfer>(source, paint);
    114         }
    115     }
    116     return nullptr;
    117 }
    118