PixelIterator.cpp

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/*
 * Copyright (C) 2004 Ivo Danihelka (ivo@danihelka.net)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */
#include "PixelIterator.h"

#include "SurfaceLock.h"
#include "PixelTool.h"

#include <assert.h>

//-----------------------------------------------------------------
/**
 * Creates new pixel iterator and locks the surface.
 */
PixelIterator::PixelIterator(SDL_Surface *surface)
{
    m_surface = surface;
    m_lock = new SurfaceLock(m_surface);
    m_p = static_cast<Uint8*>(surface->pixels);
    m_end = m_p + m_surface->h * m_surface->pitch;
    m_bpp = surface->format->BytesPerPixel;
}
//-----------------------------------------------------------------
/**
 * Unlocks surface.
 */
PixelIterator::~PixelIterator()
{
    delete m_lock;
}
//-----------------------------------------------------------------
    void
PixelIterator::setPos(const V2 &pos)
{
    int x = pos.getX();
    int y = pos.getY();
    assert((0 <= x && x < m_surface->w) && (0 <= y && y < m_surface->h));

    m_p = static_cast<Uint8*>(m_surface->pixels) +
        y * m_surface->pitch +
        x * m_bpp;
}
//-----------------------------------------------------------------
bool
PixelIterator::isTransparent() const
{
    return getPixel() == m_surface->format->colorkey;
}
//-----------------------------------------------------------------
SDL_Color
PixelIterator::getColor() const
{
    SDL_Color color;
    SDL_GetRGBA(getPixel(), m_surface->format,
            &color.r, &color.g, &color.b, &color.unused);
    return color;
}
//-----------------------------------------------------------------
Uint32
PixelIterator::getPixel() const
{
    return PixelTool::unpackPixel(m_bpp, m_p);
}
//-----------------------------------------------------------------
    void
PixelIterator::putColor(const SDL_Color &color)
{
    Uint32 pixel = SDL_MapRGBA(m_surface->format,
            color.r, color.g, color.b, color.unused);
    putPixel(pixel);
}
//-----------------------------------------------------------------
    void
PixelIterator::putPixel(Uint32 pixel)
{
    PixelTool::packPixel(m_bpp, m_p, pixel);
}

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