mirror of
https://github.com/libretro/scummvm.git
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133 lines
3.4 KiB
C++
133 lines
3.4 KiB
C++
// Residual - Virtual machine to run LucasArts' 3D adventure games
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// Copyright (C) 2003-2004 The ScummVM-Residual Team (www.scummvm.org)
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include "stdafx.h"
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#include <cstdlib>
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#include <cstring>
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#include "bitmap.h"
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#include "bits.h"
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#include "smush.h"
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#include "debug.h"
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#include "driver_gl.h"
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#define BITMAP_TEXTURE_SIZE 256
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static void decompress_codec3(const char *compressed, char *result);
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Bitmap::Bitmap(const char *filename, const char *data, int len) :
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Resource(filename) {
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if (len < 8 || memcmp(data, "BM F\0\0\0", 8) != 0)
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error("Invalid magic loading bitmap\n");
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int codec = READ_LE_UINT32(data + 8);
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_numImages = READ_LE_UINT32(data + 16);
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_x = READ_LE_UINT32(data + 20);
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_y = READ_LE_UINT32(data + 24);
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_format = READ_LE_UINT32(data + 32);
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_width = READ_LE_UINT32(data + 128);
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_height = READ_LE_UINT32(data + 132);
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_currImage = 1;
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_data = new char *[_numImages];
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int pos = 0x88;
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for (int i = 0; i < _numImages; i++) {
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_data[i] = new char[2 * _width * _height];
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if (codec == 0) {
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memcpy(_data[i], data + pos, 2 * _width * _height);
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pos += 2 * _width * _height + 8;
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} else if (codec == 3) {
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int compressed_len = READ_LE_UINT32(data + pos);
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decompress_codec3(data + pos + 4, _data[i]);
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pos += compressed_len + 12;
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}
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#ifdef SYSTEM_BIG_ENDIAN
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if (_format == 1)
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for (int j = 0; j < _width * _height; ++j) {
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((uint16 *)_data[i])[j] = SWAP_BYTES_16(((uint16 *)_data[i])[j]);
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}
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#endif
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}
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g_driver->createBitmap(this);
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}
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void Bitmap::draw() const {
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if (_currImage == 0)
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return;
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g_driver->drawBitmap(this);
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}
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Bitmap::~Bitmap() {
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for (int i = 0; i < _numImages; i++)
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delete[] _data[i];
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delete[] _data;
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g_driver->destroyBitmap(this);
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}
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#define GET_BIT do { bit = bitstr_value & 1; \
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bitstr_len--; \
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bitstr_value >>= 1; \
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if (bitstr_len == 0) { \
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bitstr_value = READ_LE_UINT16(compressed); \
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bitstr_len = 16; \
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compressed += 2; \
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} \
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} while (0)
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static void decompress_codec3(const char *compressed, char *result) {
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int bitstr_value = READ_LE_UINT16(compressed);
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int bitstr_len = 16;
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compressed += 2;
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bool bit;
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for (;;) {
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GET_BIT;
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if (bit == 1)
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*result++ = *compressed++;
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else {
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GET_BIT;
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int copy_len, copy_offset;
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if (bit == 0) {
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GET_BIT;
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copy_len = 2 * bit;
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GET_BIT;
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copy_len += bit + 3;
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copy_offset = *(uint8 *)(compressed++) - 0x100;
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} else {
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copy_offset = (*(uint8 *)(compressed) | (*(uint8 *)(compressed + 1) & 0xf0) << 4) - 0x1000;
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copy_len = (*(uint8 *)(compressed + 1) & 0xf) + 3;
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compressed += 2;
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if (copy_len == 3) {
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copy_len = *(uint8 *)(compressed++) + 1;
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if (copy_len == 1)
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return;
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}
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}
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while (copy_len > 0) {
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*result = result[copy_offset];
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result++;
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copy_len--;
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}
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}
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}
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}
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