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

#ifndef DRAWING_MODE_COPY_H
#define DRAWING_MODE_COPY_H

#include "DrawingMode.h"

// BLEND_COPY
#define BLEND_COPY(d, r2, g2, b2, a, r1, g1, b1) \
{ \
        BLEND_FROM(d, r1, g1, b1, r2, g2, b2, a); \
}

// ASSIGN_COPY
#define ASSIGN_COPY(d, r, g, b, a) \
{ \
        d[0] = (b); \
        d[1] = (g); \
        d[2] = (r); \
        d[3] = (a); \
}


// blend_pixel_copy
void
blend_pixel_copy(int x, int y, const color_type& c, uint8 cover,
                                 agg_buffer* buffer, const PatternHandler* pattern)
{
        uint8* p = buffer->row_ptr(y) + (x << 2);
        rgb_color color = pattern->ColorAt(x, y);
        if (cover == 255) {
                ASSIGN_COPY(p, color.red, color.green, color.blue, color.alpha);
        } else if (cover != 0) {
                rgb_color l = pattern->LowColor();
                BLEND_COPY(p, color.red, color.green, color.blue, cover,
                                   l.red, l.green, l.blue);
        }
}

// blend_hline_copy
void
blend_hline_copy(int x, int y, unsigned len, 
                                                 const color_type& c, uint8 cover,
                                                 agg_buffer* buffer, const PatternHandler* pattern)
{
        if (cover == 255) {
                // cache the low and high color as 32bit values
                // high color
                rgb_color color = pattern->HighColor();
                uint32 vh;
                uint8* p8 = (uint8*)&vh;
                p8[0] = (uint8)color.blue;
                p8[1] = (uint8)color.green;
                p8[2] = (uint8)color.red;
                p8[3] = 255;
                // low color
                color = pattern->LowColor();
                uint32 vl;
                p8 = (uint8*)&vl;
                p8[0] = (uint8)color.blue;
                p8[1] = (uint8)color.green;
                p8[2] = (uint8)color.red;
                p8[3] = 255;
                // row offset as 32bit pointer
                uint32* p32 = (uint32*)(buffer->row_ptr(y)) + x;
                do {
                        if (pattern->IsHighColor(x, y))
                                *p32 = vh;
                        else
                                *p32 = vl;
                        p32++;
                        x++;
                } while(--len);
        } else  if (cover != 0) {
                uint8* p = buffer->row_ptr(y) + (x << 2);
                rgb_color l = pattern->LowColor();
                do {
                        rgb_color color = pattern->ColorAt(x, y);
                        BLEND_COPY(p, color.red, color.green, color.blue, cover,
                                           l.red, l.green, l.blue);
                        x++;
                        p += 4;
                } while(--len);
        }
}

// blend_solid_hspan_copy
void
blend_solid_hspan_copy(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);
        rgb_color l = pattern->LowColor();
        do {
                rgb_color color = pattern->ColorAt(x, y);
                if (*covers) {
                        if (*covers == 255) {
                                ASSIGN_COPY(p, color.red, color.green, color.blue, color.alpha);
                        } else if (*covers != 0) {
                                BLEND_COPY(p, color.red, color.green, color.blue, *covers,
                                                   l.red, l.green, l.blue);
                        }
                }
                covers++;
                p += 4;
                x++;
        } while(--len);
}



// blend_solid_vspan_copy
void
blend_solid_vspan_copy(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);
        rgb_color l = pattern->LowColor();
        do {
                rgb_color color = pattern->ColorAt(x, y);
                if (*covers) {
                        if (*covers == 255) {
                                ASSIGN_COPY(p, color.red, color.green, color.blue, color.alpha);
                        } else if (*covers != 0) {
                                BLEND_COPY(p, color.red, color.green, color.blue, *covers,
                                                   l.red, l.green, l.blue);
                        }
                }
                covers++;
                p += buffer->stride();
                y++;
        } while(--len);
}


// blend_color_hspan_copy
void
blend_color_hspan_copy(int x, int y, unsigned len, const color_type* colors, 
                                           const uint8* covers, uint8 cover,
                                           agg_buffer* buffer, const PatternHandler* pattern)
{
        uint8* p = buffer->row_ptr(y) + (x << 2);
        rgb_color l = pattern->LowColor();
        if (covers) {
                // non-solid opacity
                do {
                        if(*covers) {
                                if(*covers == 255) {
                                        ASSIGN_COPY(p, colors->r, colors->g, colors->b, colors->a);
                                } else if (*covers != 0) {
                                        BLEND_COPY(p, colors->r, colors->g, colors->b, *covers,
                                                           l.red, l.green, l.blue);
                                }
                        }
                        covers++;
                        p += 4;
                        ++colors;
                } while(--len);
        } else {
                // solid full opcacity
                if (cover == 255) {
                        do {
                                ASSIGN_COPY(p, colors->r, colors->g, colors->b, colors->a);
                                p += 4;
                                ++colors;
                        } while(--len);
                // solid partial opacity
                } else if (cover != 0) {
                        do {
                                BLEND_COPY(p, colors->r, colors->g, colors->b, cover,
                                                   l.red, l.green, l.blue);
                                p += 4;
                                ++colors;
                        } while(--len);
                }
        }
}

#endif // DRAWING_MODE_COPY_H