mirror of
https://github.com/JGRennison/OpenTTD-patches.git
synced 2024-10-31 15:20:10 +00:00
386 lines
10 KiB
C++
386 lines
10 KiB
C++
/* $Id$ */
|
|
|
|
/*
|
|
* This file is part of OpenTTD.
|
|
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
|
|
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/** @file bmp.cpp Read and write support for bmps. */
|
|
|
|
#include "stdafx.h"
|
|
#include "bmp.h"
|
|
#include "core/bitmath_func.hpp"
|
|
#include "core/alloc_func.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 colours if available in info header */
|
|
if (header_size >= 16) {
|
|
SkipBytes(buffer, 12); // skip image size and resolution
|
|
info->palette_size = ReadDword(buffer); // number of colours 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);
|
|
|
|
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 = CallocT<byte>(info->width * info->height * ((info->bpp == 24) ? 3 : 1));
|
|
|
|
/* 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();
|
|
}
|
|
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();
|
|
}
|
|
}
|
|
|
|
void BmpDestroyData(BmpData *data)
|
|
{
|
|
assert(data != NULL);
|
|
free(data->palette);
|
|
free(data->bitmap);
|
|
}
|