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      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 "SkColorData.h"
     13 #include "SkPaint.h"
     14 #include "SkTemplates.h"
     15 #include "SkUtils.h"
     16 #include "SkXfermodePriv.h"
     17 
     18 ///////////////////////////////////////////////////////////////////////////////
     19 
     20 class Sprite_D32_S32 : public SkSpriteBlitter {
     21 public:
     22     Sprite_D32_S32(const SkPixmap& src, U8CPU alpha)  : INHERITED(src) {
     23         SkASSERT(src.colorType() == kN32_SkColorType);
     24 
     25         unsigned flags32 = 0;
     26         if (255 != alpha) {
     27             flags32 |= SkBlitRow::kGlobalAlpha_Flag32;
     28         }
     29         if (!src.isOpaque()) {
     30             flags32 |= SkBlitRow::kSrcPixelAlpha_Flag32;
     31         }
     32 
     33         fProc32 = SkBlitRow::Factory32(flags32);
     34         fAlpha = alpha;
     35     }
     36 
     37     void blitRect(int x, int y, int width, int height) override {
     38         SkASSERT(width > 0 && height > 0);
     39         uint32_t* SK_RESTRICT dst = fDst.writable_addr32(x, y);
     40         const uint32_t* SK_RESTRICT src = fSource.addr32(x - fLeft, y - fTop);
     41         size_t dstRB = fDst.rowBytes();
     42         size_t srcRB = fSource.rowBytes();
     43         SkBlitRow::Proc32 proc = fProc32;
     44         U8CPU             alpha = fAlpha;
     45 
     46         do {
     47             proc(dst, src, width, alpha);
     48             dst = (uint32_t* SK_RESTRICT)((char*)dst + dstRB);
     49             src = (const uint32_t* SK_RESTRICT)((const char*)src + srcRB);
     50         } while (--height != 0);
     51     }
     52 
     53 private:
     54     SkBlitRow::Proc32   fProc32;
     55     U8CPU               fAlpha;
     56 
     57     typedef SkSpriteBlitter INHERITED;
     58 };
     59 
     60 ///////////////////////////////////////////////////////////////////////////////
     61 
     62 class Sprite_D32_S32A_Xfer: public SkSpriteBlitter {
     63 public:
     64     Sprite_D32_S32A_Xfer(const SkPixmap& source, const SkPaint& paint) : SkSpriteBlitter(source) {
     65         fXfermode = SkXfermode::Peek(paint.getBlendMode());
     66         SkASSERT(fXfermode);
     67     }
     68 
     69     void blitRect(int x, int y, int width, int height) override {
     70         SkASSERT(width > 0 && height > 0);
     71         uint32_t* SK_RESTRICT dst = fDst.writable_addr32(x, y);
     72         const uint32_t* SK_RESTRICT src = fSource.addr32(x - fLeft, y - fTop);
     73         size_t dstRB = fDst.rowBytes();
     74         size_t srcRB = fSource.rowBytes();
     75         SkXfermode* xfermode = fXfermode;
     76 
     77         do {
     78             xfermode->xfer32(dst, src, width, nullptr);
     79 
     80             dst = (uint32_t* SK_RESTRICT)((char*)dst + dstRB);
     81             src = (const uint32_t* SK_RESTRICT)((const char*)src + srcRB);
     82         } while (--height != 0);
     83     }
     84 
     85 protected:
     86     SkXfermode* fXfermode;
     87 
     88 private:
     89     typedef SkSpriteBlitter INHERITED;
     90 };
     91 
     92 ///////////////////////////////////////////////////////////////////////////////
     93 
     94 SkSpriteBlitter* SkSpriteBlitter::ChooseL32(const SkPixmap& source, const SkPaint& paint,
     95                                             SkArenaAlloc* allocator) {
     96     SkASSERT(allocator != nullptr);
     97 
     98     if (paint.getColorFilter() != nullptr) {
     99         return nullptr;
    100     }
    101     if (paint.getMaskFilter() != nullptr) {
    102         return nullptr;
    103     }
    104 
    105     U8CPU alpha = paint.getAlpha();
    106 
    107     if (source.colorType() == kN32_SkColorType) {
    108         if (paint.isSrcOver()) {
    109             // this can handle alpha, but not xfermode
    110             return allocator->make<Sprite_D32_S32>(source, alpha);
    111         }
    112         if (255 == alpha) {
    113             // this can handle an xfermode, but not alpha
    114             return allocator->make<Sprite_D32_S32A_Xfer>(source, paint);
    115         }
    116     }
    117     return nullptr;
    118 }
    119