+
−/* $Id$ */
+
−
+
−#include "stdafx.h"
+
−#include "openttd.h"
+
−#include "gfx.h"
+
−#include "bmp.h"
+
−#include "macros.h"
+
−#include "helpers.hpp"
+
−
+
−void BmpInitializeBuffer(BmpBuffer *buffer, FILE *file) {
+
−	buffer->pos      = -1;
+
−	buffer->file     = file;
+
−	buffer->read     = 0;
+
−	buffer->real_pos = ftell(file);
+
−}
+
−
+
−static inline void AdvanceBuffer(BmpBuffer *buffer)
+
−{
+
−	buffer->read = (int)fread(buffer->data, 1, BMP_BUFFER_SIZE, buffer->file);
+
−	buffer->pos  = 0;
+
−}
+
−
+
−static inline bool EndOfBuffer(BmpBuffer *buffer)
+
−{
+
−	if (buffer->pos == buffer->read || buffer->pos < 0) AdvanceBuffer(buffer);
+
−	return buffer->pos == buffer->read;
+
−}
+
−
+
−static inline byte ReadByte(BmpBuffer *buffer)
+
−{
+
−	if (buffer->pos == buffer->read || buffer->pos < 0) AdvanceBuffer(buffer);
+
−	buffer->real_pos++;
+
−	return buffer->data[buffer->pos++];
+
−}
+
−
+
−static inline uint16 ReadWord(BmpBuffer *buffer)
+
−{
+
−	uint16 var = ReadByte(buffer);
+
−	return var | (ReadByte(buffer) << 8);
+
−}
+
−
+
−static inline uint32 ReadDword(BmpBuffer *buffer)
+
−{
+
−	uint32 var = ReadWord(buffer);
+
−	return var | (ReadWord(buffer) << 16);
+
−}
+
−
+
−static inline void SkipBytes(BmpBuffer *buffer, int bytes)
+
−{
+
−	int i;
+
−	for (i = 0; i < bytes; i++) ReadByte(buffer);
+
−}
+
−
+
−static inline void SetStreamOffset(BmpBuffer *buffer, int offset)
+
−{
+
−	fseek(buffer->file, offset, SEEK_SET);
+
−	buffer->pos = -1;
+
−	buffer->real_pos = offset;
+
−	AdvanceBuffer(buffer);
+
−}
+
−
+
−/**
+
− * Reads a 1 bpp uncompressed bitmap
+
− * The bitmap is converted to a 8 bpp bitmap
+
− */
+
−static inline bool BmpRead1(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
+
−{
+
−	uint x, y, i;
+
−	byte pad = GB(4 - info->width / 8, 0, 2);
+
−	byte *pixel_row;
+
−	byte b;
+
−	for (y = info->height; y > 0; y--) {
+
−		x = 0;
+
−		pixel_row = &data->bitmap[(y - 1) * info->width];
+
−		while (x < info->width) {
+
−			if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
+
−			b = ReadByte(buffer);
+
−			for (i = 8; i > 0; i--) {
+
−				if (x < info->width) *pixel_row++ = GB(b, i - 1, 1);
+
−				x++;
+
−			}
+
−		}
+
−		/* Padding for 32 bit align */
+
−		SkipBytes(buffer, pad);
+
−	}
+
−	return true;
+
−}
+
−
+
−/**
+
− * Reads a 4 bpp uncompressed bitmap
+
− * The bitmap is converted to a 8 bpp bitmap
+
− */
+
−static inline bool BmpRead4(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
+
−{
+
−	uint x, y;
+
−	byte pad = GB(4 - info->width / 2, 0, 2);
+
−	byte *pixel_row;
+
−	byte b;
+
−	for (y = info->height; y > 0; y--) {
+
−		x = 0;
+
−		pixel_row = &data->bitmap[(y - 1) * info->width];
+
−		while (x < info->width) {
+
−			if (EndOfBuffer(buffer)) return false;  // the file is shorter than expected
+
−			b = ReadByte(buffer);
+
−			*pixel_row++ = GB(b, 4, 4);
+
−			x++;
+
−			if (x < info->width) {
+
−				*pixel_row++ = GB(b, 0, 4);
+
−				x++;
+
−			}
+
−		}
+
−		/* Padding for 32 bit align */
+
−		SkipBytes(buffer, pad);
+
−	}
+
−	return true;
+
−}
+
−
+
−/**
+
− * Reads a 4-bit RLE compressed bitmap
+
− * The bitmap is converted to a 8 bpp bitmap
+
− */
+
−static inline bool BmpRead4Rle(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
+
−{
+
−	uint i;
+
−	uint x = 0;
+
−	uint y = info->height - 1;
+
−	byte n, c, b;
+
−	byte *pixel = &data->bitmap[y * info->width];
+
−	while (y != 0 || x < info->width) {
+
−		if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
+
−		n = ReadByte(buffer);
+
−		c = ReadByte(buffer);
+
−		if (n == 0) {
+
−			switch (c) {
+
−			case 0: // end of line
+
−				x = 0;
+
−				pixel = &data->bitmap[--y * info->width];
+
−				break;
+
−			case 1: // end of bitmap
+
−				x = info->width;
+
−				y = 0;
+
−				pixel = NULL;
+
−				break;
+
−			case 2: // delta
+
−				x += ReadByte(buffer);
+
−				i = ReadByte(buffer);
+
−				if (x >= info->width || (y == 0 && i > 0)) return false;
+
−				y -= i;
+
−				pixel = &data->bitmap[y * info->width + x];
+
−				break;
+
−			default: // uncompressed
+
−				i = 0;
+
−				while (i++ < c) {
+
−					if (EndOfBuffer(buffer) || x >= info->width) return false;
+
−					b = ReadByte(buffer);
+
−					*pixel++ = GB(b, 4, 4);
+
−					x++;
+
−					if (x < info->width && i++ < c) {
+
−						*pixel++ = GB(b, 0, 4);
+
−						x++;
+
−					}
+
−				}
+
−				/* Padding for 16 bit align */
+
−				SkipBytes(buffer, ((c + 1) / 2) % 2);
+
−				break;
+
−			}
+
−		} else {
+
−			i = 0;
+
−			while (i++ < n) {
+
−				if (EndOfBuffer(buffer) || x >= info->width) return false;
+
−				*pixel++ = GB(c, 4, 4);
+
−				x++;
+
−				if (x < info->width && i++ < n) {
+
−					*pixel++ = GB(c, 0, 4);
+
−					x++;
+
−				}
+
−			}
+
−		}
+
−	}
+
−	return true;
+
−}
+
−
+
−/**
+
− * Reads a 8 bpp bitmap
+
− */
+
−static inline bool BmpRead8(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
+
−{
+
−	uint i;
+
−	uint y;
+
−	byte pad = GB(4 - info->width, 0, 2);
+
−	byte *pixel;
+
−	for (y = info->height; y > 0; y--) {
+
−		if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
+
−		pixel = &data->bitmap[(y - 1) * info->width];
+
−		for (i = 0; i < info->width; i++) *pixel++ = ReadByte(buffer);
+
−		/* Padding for 32 bit align */
+
−		SkipBytes(buffer, pad);
+
−	}
+
−	return true;
+
−}
+
−
+
−/**
+
− * Reads a 8-bit RLE compressed bpp bitmap
+
− */
+
−static inline bool BmpRead8Rle(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
+
−{
+
−	uint i;
+
−	uint x = 0;
+
−	uint y = info->height - 1;
+
−	byte n, c;
+
−	byte *pixel = &data->bitmap[y * info->width];
+
−	while (y != 0 || x < info->width) {
+
−		if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
+
−		n = ReadByte(buffer);
+
−		c = ReadByte(buffer);
+
−		if (n == 0) {
+
−			switch (c) {
+
−			case 0: // end of line
+
−				x = 0;
+
−				pixel = &data->bitmap[--y * info->width];
+
−				break;
+
−			case 1: // end of bitmap
+
−				x = info->width;
+
−				y = 0;
+
−				pixel = NULL;
+
−				break;
+
−			case 2: // delta
+
−				x += ReadByte(buffer);
+
−				i = ReadByte(buffer);
+
−				if (x >= info->width || (y == 0 && i > 0)) return false;
+
−				y -= i;
+
−				pixel = &data->bitmap[y * info->width + x];
+
−				break;
+
−			default: // uncompressed
+
−				if ((x += c) > info->width) return false;
+
−				for (i = 0; i < c; i++) *pixel++ = ReadByte(buffer);
+
−				/* Padding for 16 bit align */
+
−				SkipBytes(buffer, c % 2);
+
−				break;
+
−			}
+
−		} else {
+
−			for (i = 0; i < n; i++) {
+
−				if (x >= info->width) return false;
+
−				*pixel++ = c;
+
−				x++;
+
−			}
+
−		}
+
−	}
+
−	return true;
+
−}
+
−
+
−/**
+
− * Reads a 24 bpp uncompressed bitmap
+
− */
+
−static inline bool BmpRead24(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
+
−{
+
−	uint x, y;
+
−	byte pad = GB(4 - info->width * 3, 0, 2);
+
−	byte *pixel_row;
+
−	for (y = info->height; y > 0; y--) {
+
−		pixel_row = &data->bitmap[(y - 1) * info->width * 3];
+
−		for (x = 0; x < info->width; x++) {
+
−			if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
+
−			*(pixel_row + 2) = ReadByte(buffer); // green
+
−			*(pixel_row + 1) = ReadByte(buffer); // blue
+
−			*pixel_row       = ReadByte(buffer); // red
+
−			pixel_row += 3;
+
−		}
+
−		/* Padding for 32 bit align */
+
−		SkipBytes(buffer, pad);
+
−	}
+
−	return true;
+
−}
+
−
+
−/*
+
− * Reads bitmap headers, and palette (if any)
+
− */
+
−bool BmpReadHeader(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
+
−{
+
−	uint32 header_size;
+
−	assert(info != NULL);
+
−
+
−	/* Reading BMP header */
+
−	if (ReadWord(buffer) != 0x4D42) return false; // signature should be 'BM'
+
−	SkipBytes(buffer, 8); // skip file size and reserved
+
−	info->offset = ReadDword(buffer);
+
−
+
−	/* Reading info header */
+
−	header_size = ReadDword(buffer);
+
−	if (header_size < 12) return false; // info header should be at least 12 bytes long
+
−
+
−	info->os2_bmp = (header_size == 12); // OS/2 1.x or windows 2.x info header is 12 bytes long
+
−
+
−	if (info->os2_bmp) {
+
−		info->width = ReadWord(buffer);
+
−		info->height = ReadWord(buffer);
+
−		header_size -= 8;
+
−	} else {
+
−		info->width = ReadDword(buffer);
+
−		info->height = ReadDword(buffer);
+
−		header_size -= 12;
+
−	}
+
−
+
−	if (ReadWord(buffer) != 1) return false; // BMP can have only 1 plane
+
−
+
−	info->bpp = ReadWord(buffer);
+
−	if (info->bpp != 1 && info->bpp != 4 && info->bpp != 8 && info->bpp != 24) {
+
−		/* Only 1 bpp, 4 bpp, 8bpp and 24 bpp bitmaps are supported */
+
−		return false;
+
−	}
+
−
+
−	/* Reads compression method if available in info header*/
+
−	if ((header_size -= 4) >= 4) {
+
−		info->compression = ReadDword(buffer);
+
−		header_size -= 4;
+
−	}
+
−
+
−	/* Only 4-bit and 8-bit rle compression is supported */
+
−	if (info->compression > 2 || (info->compression > 0 && !(info->bpp == 4 || info->bpp == 8))) return false;
+
−
+
−	if (info->bpp <= 8) {
+
−		uint i;
+
−
+
−		/* Reads number of colors if available in info header */
+
−		if (header_size >= 16) {
+
−			SkipBytes(buffer, 12);                  // skip image size and resolution
+
−			info->palette_size = ReadDword(buffer); // number of colors in palette
+
−			SkipBytes(buffer, header_size - 16);    // skip the end of info header
+
−		}
+
−		if (info->palette_size == 0) info->palette_size = 1 << info->bpp;
+
−
+
−		data->palette = CallocT<Colour>(info->palette_size);
+
−		if (data->palette == NULL) return false;
+
−
+
−		for (i = 0; i < info->palette_size; i++) {
+
−			data->palette[i].b = ReadByte(buffer);
+
−			data->palette[i].g = ReadByte(buffer);
+
−			data->palette[i].r = ReadByte(buffer);
+
−			if (!info->os2_bmp) SkipBytes(buffer, 1); // unused
+
−		}
+
−	}
+
−
+
−	return buffer->real_pos <= info->offset;
+
−}
+
−
+
−/*
+
− * Reads the bitmap
+
− * 1 bpp and 4 bpp bitmaps are converted to 8 bpp bitmaps
+
− */
+
−bool BmpReadBitmap(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
+
−{
+
−	assert(info != NULL && data != NULL);
+
−
+
−	data->bitmap = (byte*)calloc(info->width * info->height, ((info->bpp == 24) ? 3 : 1) * sizeof(byte));
+
−	if (data->bitmap == NULL) return false;
+
−
+
−	/* Load image */
+
−	SetStreamOffset(buffer, info->offset);
+
−	switch (info->compression) {
+
−	case 0: // no compression
+
−		switch (info->bpp) {
+
−		case 1:  return BmpRead1(buffer, info, data);
+
−		case 4:  return BmpRead4(buffer, info, data);
+
−		case 8:  return BmpRead8(buffer, info, data);
+
−		case 24: return BmpRead24(buffer, info, data);
+
−		default: NOT_REACHED(); return false;
+
−		}
+
−	case 1:  return BmpRead8Rle(buffer, info, data); // 8-bit RLE compression
+
−	case 2:  return BmpRead4Rle(buffer, info, data); // 4-bit RLE compression
+
−	default: NOT_REACHED(); return false;
+
−	}
+
−}
+
−
+
−void BmpDestroyData(BmpData *data)
+
−{
+
−	assert(data != NULL);
+
−	free(data->palette);
+
−	free(data->bitmap);
+
−}