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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "titanic/star_control/surface_area.h"
#include "graphics/primitives.h"
namespace Titanic {
CSurfaceArea::CSurfaceArea(CVideoSurface *surface) {
_width = surface->getWidth();
_height = surface->getHeight();
_pitch = surface->getPitch();
_field0 = 0;
_colorMask = _color = 0;
_mode = SA_SOLID;
_surface = nullptr;
// Original supported other pixel depths
_bpp = surface->getPixelDepth();
_pixelsPtr = (byte *)surface->getPixels();
assert(_bpp == 2 && _pixelsPtr);
initialize();
}
void CSurfaceArea::initialize() {
_bounds = Rect(0, 0, _width - 1, _height - 1);
_centroid = FPoint(_width / 2.0, _height / 2.0);
_pixel = 0xffffff;
_field27 = _field26 = _field25 = 0;
_field24 = 0;
_rgb = _field2C = 0;
_mode = SA_SOLID;
}
void CSurfaceArea::setColor(uint rgb) {
switch (_mode) {
case SA_MODE1:
_color = 0;
_colorMask = rgb;
break;
case SA_MODE2:
_color = rgb;
_colorMask = ~rgb;
break;
case SA_XOR:
_color = rgb;
_colorMask = 0xFFFFFFFF;
break;
case SA_MODE4:
_color = 0;
_colorMask = ~rgb;
break;
default:
break;
}
}
SurfaceAreaMode CSurfaceArea::setMode(SurfaceAreaMode mode) {
SurfaceAreaMode oldMode = _mode;
_mode = mode;
setColor(_rgb);
return oldMode;
}
void CSurfaceArea::setColorFromPixel() {
pixelToRGB(_pixel, &_rgb);
setColor(_rgb);
}
void CSurfaceArea::pixelToRGB(uint pixel, uint *rgb) {
switch (_bpp) {
case 0:
*rgb = 0;
break;
case 1:
case 2: {
uint r = pixel & 0xF8;
uint g = (pixel >> 8) & 0xf8;
uint b = ((pixel >> 16) & 0xff) >> 3;
uint value = (((r << 5) | g) << 2) | b;
value &= 0xffff;
*rgb = (value << 16) | value;
break;
}
case 3:
case 4:
*rgb = pixel;
break;
}
}
double CSurfaceArea::drawLine(const FPoint &pt1, const FPoint &pt2) {
if (pt1 == pt2)
return pt1._y;
FPoint p1 = pt1, p2 = pt2;
double xp = pt1._x, yp = pt1._y;
int flags1 = (p1._x < _bounds.left ? 1 : 0)
| (p1._x > _bounds.right ? 2 : 0)
| (p1._y < _bounds.top ? 4 : 0)
| (p1._y > _bounds.bottom ? 8 : 0);
int flags2 = (p2._x < _bounds.left ? 1 : 0)
| (p2._x > _bounds.right ? 2 : 0)
| (p2._y < _bounds.top ? 4 : 0)
| (p2._y > _bounds.bottom ? 8 : 0);
// Handle any clipping
while (flags1 | flags2) {
if (flags1 & flags2)
return p1._y;
int flags = flags1 ? flags1 : flags2;
if ((flags & 1) || (flags & 2)) {
xp = (flags & 1) ? _bounds.left : _bounds.right;
yp = (p2._y - p1._y) * (xp - p1._x) / (p2._x - p1._x) + p1._y;
} else if ((flags & 4) || (flags & 8)) {
yp = (flags & 4) ? _bounds.top : _bounds.bottom;
xp = (p2._x - p1._x) * (yp - p1._y) / (p2._y - p1._y) + p1._x;
}
if (flags == flags1) {
p1._x = xp;
p1._y = yp;
flags1 = 0;
if (xp < _bounds.left)
flags1 |= 1;
if (xp > _bounds.right)
flags1 |= 2;
if (yp < _bounds.top)
flags1 |= 4;
if (yp > _bounds.bottom)
flags1 |= 8;
} else {
p2._x = xp;
p2._y = yp;
flags2 = 0;
if (xp < _bounds.left)
flags2 |= 1;
if (xp > _bounds.right)
flags2 |= 2;
if (yp < _bounds.top)
flags2 |= 4;
if (yp > _bounds.bottom)
flags2 |= 8;
}
}
Common::Point srcPos((int)(p1._x - 0.5), (int)(p1._y - 0.5));
Common::Point destPos((int)(p2._x - 0.5), (int)(p2._y - 0.5));
Graphics::Surface s;
s.setPixels(_pixelsPtr);
s.pitch = _pitch;
s.w = _width;
s.h = _height;
_surface = &s;
switch (_bpp) {
case 0:
s.format = Graphics::PixelFormat::createFormatCLUT8();
if (_mode != SA_SOLID) {
Graphics::drawLine(srcPos.x, srcPos.y, destPos.x, destPos.y, 0, plotPoint<byte>, this);
return p1._y;
}
break;
case 1:
case 2:
s.format = Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0);
if (_mode != SA_SOLID) {
Graphics::drawLine(srcPos.x, srcPos.y, destPos.x, destPos.y, 0, plotPoint<uint16>, this);
return p1._y;
}
break;
case 4:
s.format = Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0);
if (_mode != SA_SOLID) {
Graphics::drawLine(srcPos.x, srcPos.y, destPos.x, destPos.y, 0, plotPoint<uint32>, this);
return p1._y;
}
break;
default:
error("Unknown bpp");
}
s.drawLine(srcPos.x, srcPos.y, destPos.x, destPos.y, _rgb);
return p1._y;
}
} // End of namespace Titanic
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