michael@0: 
michael@0: /*
michael@0:  * Copyright 2006 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #include "SkAntiRun.h"
michael@0: #include "SkUtils.h"
michael@0: 
michael@0: void SkAlphaRuns::reset(int width) {
michael@0:     SkASSERT(width > 0);
michael@0: 
michael@0: #ifdef SK_DEBUG
michael@0:     sk_memset16((uint16_t*)fRuns, (uint16_t)(-42), width);
michael@0: #endif
michael@0:     fRuns[0] = SkToS16(width);
michael@0:     fRuns[width] = 0;
michael@0:     fAlpha[0] = 0;
michael@0: 
michael@0:     SkDEBUGCODE(fWidth = width;)
michael@0:     SkDEBUGCODE(this->validate();)
michael@0: }
michael@0: 
michael@0: #ifdef SK_DEBUG
michael@0:     void SkAlphaRuns::assertValid(int y, int maxStep) const {
michael@0:         int max = (y + 1) * maxStep - (y == maxStep - 1);
michael@0: 
michael@0:         const int16_t* runs = fRuns;
michael@0:         const uint8_t*   alpha = fAlpha;
michael@0: 
michael@0:         while (*runs) {
michael@0:             SkASSERT(*alpha <= max);
michael@0:             alpha += *runs;
michael@0:             runs += *runs;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     void SkAlphaRuns::dump() const {
michael@0:         const int16_t* runs = fRuns;
michael@0:         const uint8_t* alpha = fAlpha;
michael@0: 
michael@0:         SkDebugf("Runs");
michael@0:         while (*runs) {
michael@0:             int n = *runs;
michael@0: 
michael@0:             SkDebugf(" %02x", *alpha);
michael@0:             if (n > 1) {
michael@0:                 SkDebugf(",%d", n);
michael@0:             }
michael@0:             alpha += n;
michael@0:             runs += n;
michael@0:         }
michael@0:         SkDebugf("\n");
michael@0:     }
michael@0: 
michael@0:     void SkAlphaRuns::validate() const {
michael@0:         SkASSERT(fWidth > 0);
michael@0: 
michael@0:         int         count = 0;
michael@0:         const int16_t*  runs = fRuns;
michael@0: 
michael@0:         while (*runs) {
michael@0:             SkASSERT(*runs > 0);
michael@0:             count += *runs;
michael@0:             SkASSERT(count <= fWidth);
michael@0:             runs += *runs;
michael@0:         }
michael@0:         SkASSERT(count == fWidth);
michael@0:     }
michael@0: #endif