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- /*
- * Copyright 2006 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkBitmap.h"
- #include "src/core/SkMask.h"
- #ifndef ClearLow3Bits_DEFINED
- #define ClearLow3Bits_DEFINED
- #define ClearLow3Bits(x) ((unsigned)(x) >> 3 << 3)
- #endif
- /*
- SK_BLITBWMASK_NAME name of function(const SkBitmap& bitmap, const SkMask& mask, const SkIRect& clip, SK_BLITBWMASK_ARGS)
- SK_BLITBWMASK_ARGS list of additional arguments to SK_BLITBWMASK_NAME, beginning with a comma
- SK_BLITBWMASK_BLIT8 name of function(U8CPU byteMask, SK_BLITBWMASK_DEVTYPE* dst, int x, int y)
- SK_BLITBWMASK_GETADDR either writable_addr[8,16,32]
- SK_BLITBWMASK_DEVTYPE either U32 or U16 or U8
- */
- static void SK_BLITBWMASK_NAME(const SkPixmap& dst, const SkMask& srcMask,
- const SkIRect& clip SK_BLITBWMASK_ARGS) {
- SkASSERT(clip.fRight <= srcMask.fBounds.fRight);
- int cx = clip.fLeft;
- int cy = clip.fTop;
- int maskLeft = srcMask.fBounds.fLeft;
- unsigned mask_rowBytes = srcMask.fRowBytes;
- size_t bitmap_rowBytes = dst.rowBytes();
- unsigned height = clip.height();
- SkASSERT(mask_rowBytes != 0);
- SkASSERT(bitmap_rowBytes != 0);
- SkASSERT(height != 0);
- const uint8_t* bits = srcMask.getAddr1(cx, cy);
- SK_BLITBWMASK_DEVTYPE* device = dst.SK_BLITBWMASK_GETADDR(cx, cy);
- if (cx == maskLeft && clip.fRight == srcMask.fBounds.fRight)
- {
- do {
- SK_BLITBWMASK_DEVTYPE* dst = device;
- unsigned rb = mask_rowBytes;
- do {
- U8CPU mask = *bits++;
- SK_BLITBWMASK_BLIT8(mask, dst);
- dst += 8;
- } while (--rb != 0);
- device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
- } while (--height != 0);
- }
- else
- {
- int left_edge = cx - maskLeft;
- SkASSERT(left_edge >= 0);
- int rite_edge = clip.fRight - maskLeft;
- SkASSERT(rite_edge > left_edge);
- int left_mask = 0xFF >> (left_edge & 7);
- int rite_mask = 0xFF << (8 - (rite_edge & 7));
- rite_mask &= 0xFF; // only want low-8 bits of mask
- int full_runs = (rite_edge >> 3) - ((left_edge + 7) >> 3);
- // check for empty right mask, so we don't read off the end (or go slower than we need to)
- if (rite_mask == 0)
- {
- SkASSERT(full_runs >= 0);
- full_runs -= 1;
- rite_mask = 0xFF;
- }
- if (left_mask == 0xFF)
- full_runs -= 1;
- // back up manually so we can keep in sync with our byte-aligned src
- // and not trigger an assert from the getAddr## function
- device -= left_edge & 7;
- if (full_runs < 0)
- {
- left_mask &= rite_mask;
- SkASSERT(left_mask != 0);
- do {
- U8CPU mask = *bits & left_mask;
- SK_BLITBWMASK_BLIT8(mask, device);
- bits += mask_rowBytes;
- device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
- } while (--height != 0);
- }
- else
- {
- do {
- int runs = full_runs;
- SK_BLITBWMASK_DEVTYPE* dst = device;
- const uint8_t* b = bits;
- U8CPU mask;
- mask = *b++ & left_mask;
- SK_BLITBWMASK_BLIT8(mask, dst);
- dst += 8;
- while (--runs >= 0)
- {
- mask = *b++;
- SK_BLITBWMASK_BLIT8(mask, dst);
- dst += 8;
- }
- mask = *b & rite_mask;
- SK_BLITBWMASK_BLIT8(mask, dst);
- bits += mask_rowBytes;
- device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
- } while (--height != 0);
- }
- }
- }
- #undef SK_BLITBWMASK_NAME
- #undef SK_BLITBWMASK_ARGS
- #undef SK_BLITBWMASK_BLIT8
- #undef SK_BLITBWMASK_GETADDR
- #undef SK_BLITBWMASK_DEVTYPE
- #undef SK_BLITBWMASK_DOROWSETUP
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