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      1 /*
      2  * Copyright 2011 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 SkBlitMask_DEFINED
      9 #define SkBlitMask_DEFINED
     10 
     11 #include "SkColor.h"
     12 #include "SkMask.h"
     13 #include "SkPixmap.h"
     14 
     15 class SkBlitMask {
     16 public:
     17     /**
     18      *  Returns true if the device config and mask format were supported.
     19      *  else return false (nothing was drawn)
     20      */
     21     static bool BlitColor(const SkPixmap& device, const SkMask& mask,
     22                           const SkIRect& clip, SkColor color);
     23 
     24     /**
     25      *  Function pointer that blits the mask into a device (dst) colorized
     26      *  by color. The number of pixels to blit is specified by width and height,
     27      *  but each scanline is offset by dstRB (rowbytes) and srcRB respectively.
     28      */
     29     typedef void (*ColorProc)(void* dst, size_t dstRB,
     30                               const void* mask, size_t maskRB,
     31                               SkColor color, int width, int height);
     32 
     33     /**
     34      *  Function pointer that blits a row of mask(lcd16) into a row of dst
     35      *  colorized by a single color. The number of pixels to blit is specified
     36      *  by width.
     37      */
     38     typedef void (*BlitLCD16RowProc)(SkPMColor dst[], const uint16_t src[],
     39                                      SkColor color, int width,
     40                                      SkPMColor opaqueDst);
     41 
     42     /**
     43      *  Function pointer that blits a row of src colors through a row of a mask
     44      *  onto a row of dst colors. The RowFactory that returns this function ptr
     45      *  will have been told the formats for the mask and the dst.
     46      */
     47     typedef void (*RowProc)(SkPMColor* dst, const void* mask,
     48                             const SkPMColor* src, int width);
     49 
     50     /**
     51      *  Public entry-point to return a blitcolor BlitLCD16RowProc.
     52      */
     53     static BlitLCD16RowProc BlitLCD16RowFactory(bool isOpaque);
     54 
     55     /**
     56      *  Return either platform specific optimized blitcolor BlitLCD16RowProc,
     57      *  or nullptr if no optimized routine is available.
     58      */
     59     static BlitLCD16RowProc PlatformBlitRowProcs16(bool isOpaque);
     60 
     61     enum RowFlags {
     62         kSrcIsOpaque_RowFlag    = 1 << 0
     63     };
     64 
     65     /**
     66      *  Public entry-point to return a blitmask RowProc.
     67      *  May return nullptr if config or format are not supported.
     68      */
     69     static RowProc RowFactory(SkColorType, SkMask::Format, RowFlags);
     70 
     71     /**
     72      *  Return either platform specific optimized blitmask RowProc,
     73      *  or nullptr if no optimized routine is available.
     74      */
     75     static RowProc PlatformRowProcs(SkColorType, SkMask::Format, RowFlags);
     76 };
     77 
     78 #endif
     79