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image/bmp.cpp
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254
image/bmp.cpp
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/* 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 "image/bmp.h"
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#include "common/stream.h"
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#include "common/substream.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/codecs/codec.h"
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// NOTE: This decoder understands only so called BMP Win3.x old format
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// In order to produce files suitable for it, use ImageMagick:
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//
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// convert input.file BMP3:output.bmp
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//
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namespace Image {
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BitmapDecoder::BitmapDecoder(): _codec(nullptr), _surface(nullptr), _palette(0) {
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}
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BitmapDecoder::~BitmapDecoder() {
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destroy();
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}
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void BitmapDecoder::destroy() {
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delete _codec;
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_codec = nullptr;
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_surface = nullptr;
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_palette.clear();
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}
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bool BitmapDecoder::loadStream(Common::SeekableReadStream &stream) {
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destroy();
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uint16 fileType = stream.readUint16BE();
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uint32 imageOffset = 0;
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if (fileType == MKTAG16('B', 'M')) {
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// The bitmap file header is present
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/* uint32 fileSize = */ stream.readUint32LE();
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/* uint16 res1 = */ stream.readUint16LE();
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/* uint16 res2 = */ stream.readUint16LE();
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imageOffset = stream.readUint32LE();
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} else {
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// Not present, let's try to parse as a headerless one
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stream.seek(-2, SEEK_CUR);
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}
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uint32 infoSize = stream.readUint32LE();
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if (infoSize != 40 && infoSize != 52 && infoSize != 56 && infoSize != 108 && infoSize != 124) {
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warning("Only Windows v1-v5 bitmaps are supported, unknown header: %d", infoSize);
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return false;
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}
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uint32 width = stream.readUint32LE();
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int32 height = stream.readSint32LE();
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if (width == 0 || height == 0)
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return false;
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if (height < 0) {
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warning("Right-side up bitmaps not supported");
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return false;
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}
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/* uint16 planes = */ stream.readUint16LE();
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uint16 bitsPerPixel = stream.readUint16LE();
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if (bitsPerPixel != 4 && bitsPerPixel != 8 && bitsPerPixel != 16 && bitsPerPixel != 24 && bitsPerPixel != 32) {
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warning("%dbpp bitmaps not supported", bitsPerPixel);
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return false;
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}
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uint32 compression = stream.readUint32BE();
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if (bitsPerPixel == 16 && compression != SWAP_CONSTANT_32(0)) {
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warning("only RGB555 raw mode supported for %dbpp bitmaps", bitsPerPixel);
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return false;
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}
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uint32 imageSize = stream.readUint32LE();
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/* uint32 pixelsPerMeterX = */ stream.readUint32LE();
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/* uint32 pixelsPerMeterY = */ stream.readUint32LE();
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uint32 paletteColorCount = stream.readUint32LE();
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/* uint32 colorsImportant = */ stream.readUint32LE();
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stream.seek(infoSize - 40, SEEK_CUR);
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if (bitsPerPixel == 4 || bitsPerPixel == 8) {
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if (paletteColorCount == 0)
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paletteColorCount = bitsPerPixel == 8 ? 256 : 16;
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// Read the palette
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_palette.resize(paletteColorCount, false);
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for (uint16 i = 0; i < paletteColorCount; i++) {
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byte b = stream.readByte();
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byte g = stream.readByte();
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byte r = stream.readByte();
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stream.readByte();
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_palette.set(i, r, g, b);
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}
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}
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// Create the codec (it will warn about unhandled compression)
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_codec = createBitmapCodec(compression, 0, width, height, bitsPerPixel);
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if (!_codec)
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return false;
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// If the image offset is zero (like in headerless ones), set it to the current
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// position.
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if (imageOffset == 0)
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imageOffset = stream.pos();
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// If the image size is zero, set it to the rest of the stream.
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if (imageSize == 0)
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imageSize = stream.size() - imageOffset;
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// Grab the frame data
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Common::SeekableSubReadStream subStream(&stream, imageOffset, imageOffset + imageSize);
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// We only support raw bitmaps for now
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_surface = _codec->decodeFrame(subStream);
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return true;
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}
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bool writeBMP(Common::WriteStream &out, const Graphics::Surface &input, const byte *palette) {
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const Graphics::PixelFormat requiredFormat_3byte = Graphics::PixelFormat::createFormatBGR24();
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Graphics::Surface *tmp = NULL;
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const Graphics::Surface *surface;
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if (input.format == requiredFormat_3byte) {
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surface = &input;
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} else {
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surface = tmp = input.convertTo(requiredFormat_3byte, palette);
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}
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int dstPitch = surface->w * 3;
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int extraDataLength = (dstPitch % 4) ? 4 - (dstPitch % 4) : 0;
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int padding = 0;
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out.writeByte('B');
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out.writeByte('M');
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out.writeUint32LE(surface->h * dstPitch + 54);
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out.writeUint32LE(0);
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out.writeUint32LE(54);
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out.writeUint32LE(40);
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out.writeUint32LE(surface->w);
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out.writeUint32LE(surface->h);
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out.writeUint16LE(1);
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out.writeUint16LE(24);
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out.writeUint32LE(0);
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out.writeUint32LE(0);
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out.writeUint32LE(0);
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out.writeUint32LE(0);
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out.writeUint32LE(0);
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out.writeUint32LE(0);
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for (uint y = surface->h; y-- > 0;) {
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out.write((const void *)surface->getBasePtr(0, y), dstPitch);
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out.write(&padding, extraDataLength);
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}
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// free tmp surface
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if (tmp) {
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tmp->free();
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delete tmp;
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}
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return true;
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}
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bool writePalettedBMP(Common::WriteStream &out, const Graphics::Surface &surface, const byte *palette) {
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// We assume surface is already 8bpp indexed
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// surface->pitch should be >= surface->w
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const int bytesPerPixel = 1;
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const int rowSize = surface.w * bytesPerPixel;
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const int rowPadding = (4 - (rowSize & 3)) & 3;
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const uint32 paletteSize = 256 * 4;
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const uint32 pixelDataSize = (rowSize + rowPadding) * surface.h;
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const uint32 dataOffset = 14 + 40 + paletteSize;
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const uint32 fileSize = dataOffset + pixelDataSize;
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/* === BITMAPFILEHEADER === */
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out.writeByte('B');
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out.writeByte('M');
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out.writeUint32LE(fileSize);
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out.writeUint16LE(0);
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out.writeUint16LE(0);
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out.writeUint32LE(dataOffset);
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/* === BITMAPINFOHEADER === */
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out.writeUint32LE(40); // biSize
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out.writeUint32LE(surface.w);
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out.writeUint32LE(surface.h);
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out.writeUint16LE(1); // planes
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out.writeUint16LE(8); // bit count
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out.writeUint32LE(0); // BI_RGB
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out.writeUint32LE(pixelDataSize);
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out.writeUint32LE(0); // x ppm
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out.writeUint32LE(0); // y ppm
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out.writeUint32LE(256); // colors used
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out.writeUint32LE(256); // important colors
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/* === PALETTE === */
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// Input palette: RGBRGBRGB...
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// BMP palette: B G R 0
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for (int i = 0; i < 256; i++) {
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out.writeByte(palette[i * 3 + 2]); // B
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out.writeByte(palette[i * 3 + 1]); // G
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out.writeByte(palette[i * 3 + 0]); // R
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out.writeByte(0); // reserved
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}
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/* === PIXEL DATA (bottom-up) === */
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byte pad[3] = { 0, 0, 0 };
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for (int y = surface.h - 1; y >= 0; y--) {
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out.write(surface.getBasePtr(0, y), rowSize);
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if (rowPadding)
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out.write(pad, rowPadding);
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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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