1 /* libs/graphics/sgl/SkBlitter_A1.cpp 2 ** 3 ** Copyright 2006, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #include "SkCoreBlitters.h" 19 20 SkA1_Blitter::SkA1_Blitter(const SkBitmap& device, const SkPaint& paint) 21 : INHERITED(device) { 22 fSrcA = paint.getAlpha(); 23 } 24 25 void SkA1_Blitter::blitH(int x, int y, int width) { 26 SkASSERT(x >= 0 && y >= 0 && 27 (unsigned)(x + width) <= (unsigned)fDevice.width()); 28 29 if (fSrcA <= 0x7F) { 30 return; 31 } 32 uint8_t* dst = fDevice.getAddr1(x, y); 33 int right = x + width; 34 35 int left_mask = 0xFF >> (x & 7); 36 int rite_mask = 0xFF << (8 - (right & 7)); 37 int full_runs = (right >> 3) - ((x + 7) >> 3); 38 39 // check for empty right mask, so we don't read off the end 40 // (or go slower than we need to) 41 if (rite_mask == 0) { 42 SkASSERT(full_runs >= 0); 43 full_runs -= 1; 44 rite_mask = 0xFF; 45 } 46 if (left_mask == 0xFF) { 47 full_runs -= 1; 48 } 49 if (full_runs < 0) { 50 SkASSERT((left_mask & rite_mask) != 0); 51 *dst |= (left_mask & rite_mask); 52 } else { 53 *dst++ |= left_mask; 54 memset(dst, 0xFF, full_runs); 55 dst += full_runs; 56 *dst |= rite_mask; 57 } 58 } 59 60
