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/* libs/graphics/sgl/SkBlitter_A1.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "SkCoreBlitters.h"
SkA1_Blitter::SkA1_Blitter(const SkBitmap& device, const SkPaint& paint)
: INHERITED(device)
{
fSrcA = SkToU8(SkColorGetA(paint.getColor()));
}
void SkA1_Blitter::blitH(int x, int y, int width)
{
SkASSERT(x >= 0 && y >= 0 && (unsigned)(x + width) <= (unsigned)fDevice.width());
if (fSrcA <= 0x7F)
return;
uint8_t* dst = fDevice.getAddr1(x, y);
int right = x + width;
int left_mask = 0xFF >> (x & 7);
int rite_mask = 0xFF << (8 - (right & 7));
int full_runs = (right >> 3) - ((x + 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;
if (full_runs < 0)
{
SkASSERT((left_mask & rite_mask) != 0);
*dst |= (left_mask & rite_mask);
}
else
{
*dst++ |= left_mask;
memset(dst, 0xFF, full_runs);
dst += full_runs;
*dst |= rite_mask;
}
}
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