mirror of https://github.com/axmolengine/axmol.git
138 lines
4.5 KiB
C
138 lines
4.5 KiB
C
/* libs/graphics/sgl/SkBlitBWMaskTemplate.h
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**
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** Copyright 2006, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include "SkBitmap.h"
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#include "SkMask.h"
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#ifndef ClearLow3Bits_DEFINED
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#define ClearLow3Bits_DEFINED
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#define ClearLow3Bits(x) ((unsigned)(x) >> 3 << 3)
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#endif
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/*
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SK_BLITBWMASK_NAME name of function(const SkBitmap& bitmap, const SkMask& mask, const SkIRect& clip, SK_BLITBWMASK_ARGS)
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SK_BLITBWMASK_ARGS list of additional arguments to SK_BLITBWMASK_NAME, beginning with a comma
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SK_BLITBWMASK_BLIT8 name of function(U8CPU byteMask, SK_BLITBWMASK_DEVTYPE* dst, int x, int y)
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SK_BLITBWMASK_GETADDR either getAddr32 or getAddr16 or getAddr8
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SK_BLITBWMASK_DEVTYPE either U32 or U16 or U8
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*/
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static void SK_BLITBWMASK_NAME(const SkBitmap& bitmap, const SkMask& srcMask, const SkIRect& clip SK_BLITBWMASK_ARGS)
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{
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SkASSERT(clip.fRight <= srcMask.fBounds.fRight);
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int cx = clip.fLeft;
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int cy = clip.fTop;
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int maskLeft = srcMask.fBounds.fLeft;
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unsigned mask_rowBytes = srcMask.fRowBytes;
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unsigned bitmap_rowBytes = bitmap.rowBytes();
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unsigned height = clip.height();
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SkASSERT(mask_rowBytes != 0);
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SkASSERT(bitmap_rowBytes != 0);
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SkASSERT(height != 0);
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const uint8_t* bits = srcMask.getAddr1(cx, cy);
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SK_BLITBWMASK_DEVTYPE* device = bitmap.SK_BLITBWMASK_GETADDR(cx, cy);
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if (cx == maskLeft && clip.fRight == srcMask.fBounds.fRight)
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{
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do {
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SK_BLITBWMASK_DEVTYPE* dst = device;
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unsigned rb = mask_rowBytes;
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do {
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U8CPU mask = *bits++;
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SK_BLITBWMASK_BLIT8(mask, dst);
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dst += 8;
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} while (--rb != 0);
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device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
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} while (--height != 0);
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}
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else
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{
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int left_edge = cx - maskLeft;
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SkASSERT(left_edge >= 0);
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int rite_edge = clip.fRight - maskLeft;
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SkASSERT(rite_edge > left_edge);
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int left_mask = 0xFF >> (left_edge & 7);
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int rite_mask = 0xFF << (8 - (rite_edge & 7));
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int full_runs = (rite_edge >> 3) - ((left_edge + 7) >> 3);
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// check for empty right mask, so we don't read off the end (or go slower than we need to)
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if (rite_mask == 0)
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{
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SkASSERT(full_runs >= 0);
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full_runs -= 1;
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rite_mask = 0xFF;
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}
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if (left_mask == 0xFF)
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full_runs -= 1;
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// back up manually so we can keep in sync with our byte-aligned src
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// and not trigger an assert from the getAddr## function
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device -= left_edge & 7;
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// have cx reflect our actual starting x-coord
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cx -= left_edge & 7;
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if (full_runs < 0)
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{
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left_mask &= rite_mask;
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SkASSERT(left_mask != 0);
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do {
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U8CPU mask = *bits & left_mask;
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SK_BLITBWMASK_BLIT8(mask, device);
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bits += mask_rowBytes;
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device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
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} while (--height != 0);
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}
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else
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{
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do {
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int runs = full_runs;
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SK_BLITBWMASK_DEVTYPE* dst = device;
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const uint8_t* b = bits;
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U8CPU mask;
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mask = *b++ & left_mask;
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SK_BLITBWMASK_BLIT8(mask, dst);
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dst += 8;
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while (--runs >= 0)
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{
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mask = *b++;
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SK_BLITBWMASK_BLIT8(mask, dst);
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dst += 8;
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}
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mask = *b & rite_mask;
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SK_BLITBWMASK_BLIT8(mask, dst);
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bits += mask_rowBytes;
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device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
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} while (--height != 0);
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}
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}
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}
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#undef SK_BLITBWMASK_NAME
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#undef SK_BLITBWMASK_ARGS
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#undef SK_BLITBWMASK_BLIT8
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#undef SK_BLITBWMASK_GETADDR
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#undef SK_BLITBWMASK_DEVTYPE
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#undef SK_BLITBWMASK_DOROWSETUP
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