mirror of
https://github.com/libretro/scummvm.git
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122 lines
3.0 KiB
C++
122 lines
3.0 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/neo.h"
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namespace Image {
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NeoDecoder::NeoDecoder(byte *palette) {
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_surface = nullptr;
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_paletteDestroy = palette ? false : true;
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_palette = palette;
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_paletteColorCount = 0;
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}
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NeoDecoder::~NeoDecoder() {
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destroy();
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}
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void NeoDecoder::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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if (_paletteDestroy) {
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delete[] _palette;
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_palette = nullptr;
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}
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_paletteColorCount = 0;
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}
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bool NeoDecoder::loadStream(Common::SeekableReadStream &stream) {
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destroy();
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if (!_palette) {
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int start = stream.pos();
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if (stream.readUint16LE() != 0x00)
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warning("Header check failed for reading neo image");
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if (stream.readUint16LE() != 0x00)
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warning("Header check failed for reading neo image");
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_palette = new byte[16 * 3];
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for (int i = 0; i < 16; ++i) {
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byte v1 = stream.readByte();
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byte v2 = stream.readByte();
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_palette[i * 3 + 0] = floor((v1 & 0x07) * 255.0 / 7.0);
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_palette[i * 3 + 1] = floor((v2 & 0x70) * 255.0 / 7.0 / 16.0);
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_palette[i * 3 + 2] = floor((v2 & 0x07) * 255.0 / 7.0);
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}
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stream.seek(start + 128);
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}
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int width = 320;
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int height = 200;
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_surface = new Graphics::Surface();
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_surface->create(width, height, Graphics::PixelFormat::createFormatCLUT8());
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_paletteColorCount = 16;
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// 200 rows of image:
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for (int y = 0; y < 200; y++) {
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// 20 column blocks:
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for (int x = 0; x < 20; x++) {
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// Fetch the 4 words that make up the
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// next 16 pixels across 4 bitplanes:
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uint16 uW0 = stream.readUint16BE();
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uint16 uW1 = stream.readUint16BE();
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uint16 uW2 = stream.readUint16BE();
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uint16 uW3 = stream.readUint16BE();
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// The first pixel is found in the highest bit:
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uint32 uBit = 0x8000;
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// 16 pixels to process:
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for (int z = 0; z < 16; z++) {
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// Work out the colour index:
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int idx = 0;
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if (uW0 & uBit)
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idx += 1;
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if (uW1 & uBit)
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idx += 2;
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if (uW2 & uBit)
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idx += 4;
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if (uW3 & uBit)
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idx += 8;
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_surface->setPixel(x * 16 + z, y, idx);
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uBit >>= 1;
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}
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}
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}
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return true;
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}
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} // End of namespace Image
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