116 lines
3.1 KiB
C++
116 lines
3.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/stream.h"
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#include "common/textconsole.h"
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#include "graphics/pixelformat.h"
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#include "graphics/surface.h"
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#include "image/scr.h"
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namespace Image {
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static const byte scrPalette[16 * 3] = {
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0x00, 0x00, 0x00, /* black */
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0x00, 0x00, 0xD8, /* blue */
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0xD8, 0x00, 0x00, /* red */
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0xD8, 0x00, 0xD8, /* magenta */
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0x00, 0xD8, 0x00, /* green */
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0x00, 0xD8, 0xD8, /* cyan */
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0xD8, 0xD8, 0x00, /* yellow */
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0xD8, 0xD8, 0xD8, /* white */
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0x00, 0x00, 0x00, /* bright black */
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0x00, 0x00, 0xFF, /* bright blue */
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0xFF, 0x00, 0x00, /* bright red */
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0xFF, 0x00, 0xFF, /* bright magenta */
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0x00, 0xFF, 0x00, /* bright green */
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0x00, 0xFF, 0xFF, /* bright cyan */
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0xFF, 0xFF, 0x00, /* bright yellow */
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0xFF, 0xFF, 0xFF, /* bright white */
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};
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ScrDecoder::ScrDecoder() : _surface(nullptr), _palette(scrPalette, 16) {
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}
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ScrDecoder::~ScrDecoder() {
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destroy();
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}
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void ScrDecoder::destroy() {
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if (_surface) {
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_surface->free();
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delete _surface;
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_surface = nullptr;
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}
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}
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uint32 ScrDecoder::getPixelAddress(int x, int y) {
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uint32 y76 = y & 0xc0;
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uint32 y53 = y & 0x38;
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uint32 y20 = y & 0x07;
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return (y76 << 5) + (y20 << 8) + (y53 << 2) + (x >> 3);
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}
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uint32 ScrDecoder::getAttributeAddress(int x, int y) {
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uint32 y73 = y & 0xf8;
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return (y73 << 2) + (x >> 3);
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}
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bool ScrDecoder::loadStream(Common::SeekableReadStream &stream) {
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destroy();
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if (stream.size() != 6912)
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warning("Header check failed for reading scr image");
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byte *data = (byte *)malloc(6144 * sizeof(byte));
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byte *attributes = (byte *)malloc(768 * sizeof(byte));
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stream.read(data, 6144);
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stream.read(attributes, 768);
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int width = 256;
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int height = 192;
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_surface = new Graphics::Surface();
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_surface->create(width, height, Graphics::PixelFormat::createFormatCLUT8());
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for (int y = 0; y < height; y++) {
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for (int col = 0; col < width >> 3; col++) {
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int x = col << 3;
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byte byt = data[getPixelAddress(x, y)];
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byte attr = attributes[getAttributeAddress(x, y)];
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byte ink = attr & 0x07;
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byte paper = (attr >> 3) & 0x07;
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byte bright = (attr >> 6) & 1;
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for (int bit = 0; bit < 8; bit++) {
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bool set = (byt >> (7 - bit)) & 1;
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int color = (bright << 3) | (set ? ink : paper);
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_surface->setPixel(x + bit, y, color);
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}
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}
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}
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free(data);
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free(attributes);
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return true;
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}
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} // End of namespace Image
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