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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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/stream.h"
#include "common/textconsole.h"
#include "graphics/pixelformat.h"
#include "graphics/surface.h"
#include "image/scr.h"
namespace Image {
ScrDecoder::ScrDecoder() {
_surface = nullptr;
}
ScrDecoder::~ScrDecoder() {
destroy();
}
void ScrDecoder::destroy() {
if (_surface) {
_surface->free();
delete _surface;
_surface = nullptr;
}
}
uint32 ScrDecoder::getPixelAddress(int x, int y) {
uint32 y76 = y & 0xc0;
uint32 y53 = y & 0x38;
uint32 y20 = y & 0x07;
return (y76 << 5) + (y20 << 8) + (y53 << 2) + (x >> 3);
}
uint32 ScrDecoder::getAttributeAddress(int x, int y) {
uint32 y73 = y & 0xf8;
return (y73 << 2) + (x >> 3);
}
bool ScrDecoder::loadStream(Common::SeekableReadStream &stream) {
destroy();
if (stream.size() != 6912)
warning("Header check failed for reading scr image");
byte *data = (byte *)malloc(6144 * sizeof(byte));
byte *attributes = (byte *)malloc(768 * sizeof(byte));
stream.read(data, 6144);
stream.read(attributes, 768);
int width = 256;
int height = 192;
Graphics::PixelFormat format(4, 8, 8, 8, 8, 24, 16, 8, 0);
_surface = new Graphics::Surface();
_surface->create(width, height, format);
for (int y = 0; y < height; y++) {
for (int col = 0; col < width >> 3; col++) {
int x = col << 3;
byte byt = data[getPixelAddress(x, y)];
byte attr = attributes[getAttributeAddress(x, y)];
byte ink = attr & 0x07;
byte paper = (attr >> 3) & 0x07;
byte bright = (attr >> 6) & 1;
byte val = bright ? 0xff : 0xd8;
for (int bit = 0; bit < 8; bit++) {
bool set = (byt >> (7 - bit)) & 1;
int color = set ? ink : paper;
byte r = val * (color >> 1 & 1);
byte g = val * (color >> 2 & 1);
byte b = val * (color >> 0 & 1);
_surface->setPixel(x + bit, y, format.ARGBToColor(0xFF, r, g, b));
}
}
}
free(data);
free(attributes);
return true;
}
} // End of namespace Image
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