blob: 5638477d859c9d6e8eb73a42bdc178cb92c5d6c4 [file] [log] [blame]
/*
* 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 "SkCoreBlitters.h"
SkA1_Blitter::SkA1_Blitter(const SkBitmap& device, const SkPaint& paint)
: INHERITED(device) {
fSrcA = paint.getAlpha();
}
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;
}
}