/*

 * 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 "include/core/SkShader.h"

#include "include/private/SkColorData.h"

#include "src/core/SkCoreBlitters.h"

#include "src/core/SkXfermodePriv.h"

SkA8_Coverage_Blitter::SkA8_Coverage_Blitter(const SkPixmap& device,

                             const SkPaint& paint) : SkRasterBlitter(device) {

    SkASSERT(nullptr == paint.getShader());

    SkASSERT(paint.isSrcOver());

    SkASSERT(nullptr == paint.getColorFilter());

}

void SkA8_Coverage_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],

                                      const int16_t runs[]) {

    uint8_t* device = fDevice.writable_addr8(x, y);

    SkDEBUGCODE(int totalCount = 0;)

    for (;;) {

        int count = runs[0];

        SkASSERT(count >= 0);

        if (count == 0) {

            return;

        }

        if (antialias[0]) {

            memset(device, antialias[0], count);

        }

        runs += count;

        antialias += count;

        device += count;

        SkDEBUGCODE(totalCount += count;)

    }

    SkASSERT(fDevice.width() == totalCount);

}

void SkA8_Coverage_Blitter::blitH(int x, int y, int width) {

    memset(fDevice.writable_addr8(x, y), 0xFF, width);

}

void SkA8_Coverage_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {

    if (0 == alpha) {

        return;

    }

    uint8_t* dst = fDevice.writable_addr8(x, y);

    const size_t dstRB = fDevice.rowBytes();

    while (--height >= 0) {

        *dst = alpha;

        dst += dstRB;

    }

}

void SkA8_Coverage_Blitter::blitRect(int x, int y, int width, int height) {

    uint8_t* dst = fDevice.writable_addr8(x, y);

    const size_t dstRB = fDevice.rowBytes();

    while (--height >= 0) {

        memset(dst, 0xFF, width);

        dst += dstRB;

    }

}

void SkA8_Coverage_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {

    if (SkMask::kA8_Format != mask.fFormat) {

        this->INHERITED::blitMask(mask, clip);

        return;

    }

    int x = clip.fLeft;

    int y = clip.fTop;

    int width = clip.width();

    int height = clip.height();

    uint8_t* dst = fDevice.writable_addr8(x, y);

    const uint8_t* src = mask.getAddr8(x, y);

    const size_t srcRB = mask.fRowBytes;

    const size_t dstRB = fDevice.rowBytes();

    while (--height >= 0) {

        memcpy(dst, src, width);

        dst += dstRB;

        src += srcRB;

    }

}

const SkPixmap* SkA8_Coverage_Blitter::justAnOpaqueColor(uint32_t*) {

    return nullptr;

}