mirror of
https://github.com/libretro/scummvm.git
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269 lines
6.4 KiB
C++
269 lines
6.4 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "graphics/iff.h"
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#include "graphics/surface.h"
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#include "common/endian.h"
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#include "common/func.h"
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#include "common/iff_container.h"
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#include "common/textconsole.h"
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#include "common/util.h"
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namespace Graphics {
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void BMHD::load(Common::ReadStream *stream) {
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assert(stream);
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stream->read(this, sizeof(BMHD));
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width = FROM_BE_16(width);
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height = FROM_BE_16(height);
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x = FROM_BE_16(x);
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y = FROM_BE_16(y);
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transparentColor = FROM_BE_16(transparentColor);
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pageWidth = FROM_BE_16(pageWidth);
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pageHeight = FROM_BE_16(pageHeight);
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}
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void ILBMDecoder::loadHeader(Common::ReadStream *stream) {
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_header.load(stream);
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}
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void ILBMDecoder::loadBitmap(uint32 mode, byte *buffer, Common::ReadStream *stream) {
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assert(stream);
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uint32 numPlanes = MIN(mode & ILBM_UNPACK_PLANES, (uint32)_header.depth);
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assert(numPlanes == 1 || numPlanes == 2 || numPlanes == 3 || numPlanes == 4 || numPlanes == 5 || numPlanes == 8);
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bool packPixels = (mode & ILBM_PACK_PLANES) != 0;
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if (numPlanes != 1 && numPlanes != 2 && numPlanes != 4) {
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packPixels = false;
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}
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uint32 outPitch = _header.width;
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if (packPixels) {
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outPitch /= (8 / numPlanes);
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}
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byte *out = buffer;
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switch (_header.pack) {
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case 1: { // PackBits compressed bitmap
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Graphics::PackBitsReadStream packStream(*stream);
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// setup a buffer to hold enough data to build a line in the output
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uint32 scanlineWidth = ((_header.width + 15) / 16) << 1;
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byte *scanline = new byte[scanlineWidth * _header.depth];
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for (uint i = 0; i < _header.height; ++i) {
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byte *s = scanline;
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for (uint32 j = 0; j < _header.depth; ++j) {
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packStream.read(s, scanlineWidth);
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s += scanlineWidth;
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}
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planarToChunky(out, outPitch, scanline, scanlineWidth, numPlanes, packPixels);
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out += outPitch;
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}
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delete[] scanline;
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break;
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}
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default:
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// implement other compression types here!
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error("only RLE compressed ILBM files are supported");
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break;
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}
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}
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void ILBMDecoder::planarToChunky(byte *out, uint32 outPitch, byte *in, uint32 inWidth, uint32 nPlanes, bool packPlanes) {
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byte pix, ofs, bit;
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byte *s;
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uint32 pixels = outPitch;
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if (packPlanes) {
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pixels *= (8 / nPlanes);
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}
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for (uint32 x = 0; x < pixels; ++x) {
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pix = 0;
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ofs = x >> 3;
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bit = 0x80 >> (x & 7);
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// first build a pixel by scanning all the usable planes in the input
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s = in;
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for (uint32 plane = 0; plane < nPlanes; ++plane) {
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if (s[ofs] & bit) {
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pix |= (1 << plane);
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}
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s += inWidth;
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}
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// then output the pixel according to the requested packing
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if (!packPlanes) {
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out[x] = pix;
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} else if (nPlanes == 1) {
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out[x / 8] |= (pix << (x & 7));
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} else if (nPlanes == 2) {
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out[x / 4] |= (pix << ((x & 3) << 1));
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} else if (nPlanes == 4) {
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out[x / 2] |= (pix << ((x & 1) << 2));
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}
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}
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}
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// handles PBM subtype of IFF FORM files
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//
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struct PBMDecoder {
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/**
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* PBM header data, necessary for loadBitmap()
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*/
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Graphics::BMHD _header;
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/**
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* Fills the _header member from the given stream.
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*/
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void loadHeader(Common::ReadStream *stream);
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/**
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* Loads and unpacks the PBM bitmap data from the stream into the buffer.
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* The functions assumes the buffer is large enough to contain all data.
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*/
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void loadBitmap(byte *buffer, Common::ReadStream *stream);
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};
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void PBMDecoder::loadHeader(Common::ReadStream *stream) {
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_header.load(stream);
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}
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void PBMDecoder::loadBitmap(byte *buffer, Common::ReadStream *stream) {
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uint32 outSize = _header.width * _header.height;
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switch (_header.pack) {
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case 0:
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stream->read(buffer, outSize);
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break;
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case 1: {
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PackBitsReadStream packStream(*stream);
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packStream.read(buffer, outSize);
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break;
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}
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}
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}
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struct PBMLoader {
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PBMDecoder _decoder;
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Surface *_surface;
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byte *_colors;
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void load(Common::ReadStream &input, Surface &surface, byte *&colors) {
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_surface = &surface;
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_colors = colors;
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Common::IFFParser parser(&input);
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Common::Functor1Mem<Common::IFFChunk &, bool, PBMLoader> c(this, &PBMLoader::callback);
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parser.parse(c);
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}
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bool callback(Common::IFFChunk &chunk) {
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switch (chunk._type) {
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case ID_BMHD:
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_decoder.loadHeader(chunk._stream);
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break;
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case ID_CMAP:
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if (_colors) {
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chunk._stream->read(_colors, chunk._size);
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}
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break;
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case ID_BODY:
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if (_surface) {
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_surface->create(_decoder._header.width, _decoder._header.height, PixelFormat::createFormatCLUT8());
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_decoder.loadBitmap((byte *)_surface->pixels, chunk._stream);
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}
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return true; // stop the parser
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}
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return false;
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}
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};
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void decodePBM(Common::ReadStream &input, Surface &surface, byte *colors) {
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PBMLoader loader;
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loader.load(input, surface, colors);
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}
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PackBitsReadStream::PackBitsReadStream(Common::ReadStream &input) : _input(&input) {
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}
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PackBitsReadStream::~PackBitsReadStream() {
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}
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bool PackBitsReadStream::eos() const {
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return _input->eos();
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}
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uint32 PackBitsReadStream::read(void *dataPtr, uint32 dataSize) {
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byte *out = (byte *)dataPtr;
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uint32 left = dataSize;
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uint32 lenR = 0, lenW = 0;
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while (left > 0 && !_input->eos()) {
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lenR = _input->readByte();
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if (lenR == 128) {
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// no-op
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lenW = 0;
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} else if (lenR <= 127) {
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// literal run
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lenR++;
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lenW = MIN(lenR, left);
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for (uint32 j = 0; j < lenW; j++) {
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*out++ = _input->readByte();
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}
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for (; lenR > lenW; lenR--) {
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_input->readByte();
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}
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} else { // len > 128
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// expand run
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lenW = MIN((256 - lenR) + 1, left);
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byte val = _input->readByte();
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memset(out, val, lenW);
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out += lenW;
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}
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left -= lenW;
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}
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return dataSize - left;
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}
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} // End of namespace Graphics
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