/*
 * Copyright 2005, Stephan Aßmus <superstippi@gmx.de>. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * DrawingMode implementing B_OP_ALPHA in "Constant Overlay" mode on B_RGBA32.
 *
 */

#ifndef DRAWING_MODE_ALPHA_CO_SOLID_H
#define DRAWING_MODE_ALPHA_CO_SOLID_H

#include "DrawingModeAlphaCO.h"

// blend_pixel_alpha_co_solid
void
blend_pixel_alpha_co_solid(int x, int y, const color_type& c, uint8 cover,
                                                   agg_buffer* buffer, const PatternHandler* pattern)
{
        uint8* p = buffer->row_ptr(y) + (x << 2);
        uint16 alpha = pattern->HighColor().alpha * cover;
        if (alpha == 255 * 255) {
                ASSIGN_ALPHA_CO(p, c.r, c.g, c.b);
        } else {
                BLEND_ALPHA_CO(p, c.r, c.g, c.b, alpha);
        }
}

// blend_hline_alpha_co_solid
void
blend_hline_alpha_co_solid(int x, int y, unsigned len, 
                                                   const color_type& c, uint8 cover,
                                                   agg_buffer* buffer, const PatternHandler* pattern)
{
        uint16 alpha = pattern->HighColor().alpha * cover;
        if (alpha == 255 * 255) {
                // cache the color as 32bit values
                uint32 v;
                uint8* p8 = (uint8*)&v;
                p8[0] = c.b;
                p8[1] = c.g;
                p8[2] = c.r;
                p8[3] = 255;
                // row offset as 32bit pointer
                uint32* p32 = (uint32*)(buffer->row_ptr(y)) + x;
                do {
                        *p32 = v;
                        p32++;
                        x++;
                } while(--len);
        } else {
                uint8* p = buffer->row_ptr(y) + (x << 2);
                if (len < 4) {
                        do {
                                BLEND_ALPHA_CO(p, c.r, c.g, c.b, alpha);
                                x++;
                                p += 4;
                        } while(--len);
                } else {
                        alpha = alpha >> 8;
                        blend_line32(p, len, c.r, c.g, c.b, alpha);
                }
        }
}

// blend_solid_hspan_alpha_co_solid
void
blend_solid_hspan_alpha_co_solid(int x, int y, unsigned len, 
                                                                 const color_type& c, const uint8* covers,
                                                                 agg_buffer* buffer, const PatternHandler* pattern)
{
        uint8* p = buffer->row_ptr(y) + (x << 2);
        uint8 hAlpha = pattern->HighColor().alpha;
        do {
                uint16 alpha = hAlpha * *covers;
                if (alpha) {
                        if (alpha == 255 * 255) {
                                ASSIGN_ALPHA_CO(p, c.r, c.g, c.b);
                        } else {
                                BLEND_ALPHA_CO(p, c.r, c.g, c.b, alpha);
                        }
                }
                covers++;
                p += 4;
                x++;
        } while(--len);
}



// blend_solid_vspan_alpha_co_solid
void
blend_solid_vspan_alpha_co_solid(int x, int y, unsigned len, 
                                                                 const color_type& c, const uint8* covers,
                                                                 agg_buffer* buffer, const PatternHandler* pattern)
{
        uint8* p = buffer->row_ptr(y) + (x << 2);
        uint8 hAlpha = pattern->HighColor().alpha;
        do {
                uint16 alpha = hAlpha * *covers;
                if (alpha) {
                        if (alpha == 255 * 255) {
                                ASSIGN_ALPHA_CO(p, c.r, c.g, c.b);
                        } else {
                                BLEND_ALPHA_CO(p, c.r, c.g, c.b, alpha);
                        }
                }
                covers++;
                p += buffer->stride();
                y++;
        } while(--len);
}

#endif // DRAWING_MODE_ALPHA_CO_SOLID_H