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(svn r23893) -Change: [NewGRF] Extended chunked sprite encoding to work for bigger sprites.

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This commit is contained in:
michi_cc 2012-02-04 19:21:32 +00:00
parent f4b8cee034
commit 4702924f6e
1 changed files with 29 additions and 12 deletions
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41
src/spriteloader/grf.cpp
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@ -61,9 +61,10 @@ static bool WarnCorruptSprite(uint8 file_slot, size_t file_pos, int line)
* @param num Size of the decompressed sprite.
* @param type Type of the encoded sprite.
* @param zoom_lvl Requested zoom level.
* @param container_format Container format of the GRF this sprite is in.
* @return True if the sprite was successfully loaded.
*/
bool DecodeSingleSprite(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t file_pos, SpriteType sprite_type, int64 num, byte type, ZoomLevel zoom_lvl)
bool DecodeSingleSprite(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t file_pos, SpriteType sprite_type, int64 num, byte type, ZoomLevel zoom_lvl, byte container_format)
{
AutoFreePtr<byte> dest_orig(MallocT<byte>(num));
byte *dest = dest_orig;
@ -105,24 +106,40 @@ bool DecodeSingleSprite(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t fi
for (int y = 0; y < sprite->height; y++) {
bool last_item = false;
/* Look up in the header-table where the real data is stored for this row */
int offset = (dest_orig[y * 2 + 1] << 8) | dest_orig[y * 2];
int offset;
if (container_format >= 2 && num > UINT16_MAX) {
offset = (dest_orig[y * 4 + 3] << 24) | (dest_orig[y * 4 + 2] << 16) | (dest_orig[y * 4 + 1] << 8) | dest_orig[y * 4];
} else {
offset = (dest_orig[y * 2 + 1] << 8) | dest_orig[y * 2];
}
/* Go to that row */
dest = dest_orig + offset;
do {
if (dest + 2 > dest_orig + dest_size) {
if (dest + (container_format >= 2 && sprite->width > 256 ? 4 : 2) > dest_orig + dest_size) {
return WarnCorruptSprite(file_slot, file_pos, __LINE__);
}
SpriteLoader::CommonPixel *data;
/* Read the header:
* 0 .. 14 - length
* 15 - last_item
* 16 .. 31 - transparency bytes */
last_item = ((*dest) & 0x80) != 0;
int length = (*dest++) & 0x7F;
int skip = *dest++;
/* Read the header. */
int length, skip;
if (container_format >= 2 && sprite->width > 256) {
/* 0 .. 14 - length
* 15 - last_item
* 16 .. 31 - transparency bytes */
last_item = (dest[1] & 0x80) != 0;
length = ((dest[1] & 0x7F) << 8) | dest[0];
skip = (dest[3] << 8) | dest[2];
dest += 4;
} else {
/* 0 .. 6 - length
* 7 - last_item
* 8 .. 15 - transparency bytes */
last_item = ((*dest) & 0x80) != 0;
length = (*dest++) & 0x7F;
skip = *dest++;
}
data = &sprite->data[y * sprite->width + skip];
@ -194,7 +211,7 @@ uint8 LoadSpriteV1(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t file_po
* In case it is uncompressed, the size is 'num' - 8 (header-size). */
num = (type & 0x02) ? sprite[zoom_lvl].width * sprite[zoom_lvl].height : num - 8;
if (DecodeSingleSprite(&sprite[zoom_lvl], file_slot, file_pos, sprite_type, num, type, zoom_lvl)) return 1 << zoom_lvl;
if (DecodeSingleSprite(&sprite[zoom_lvl], file_slot, file_pos, sprite_type, num, type, zoom_lvl, 1)) return 1 << zoom_lvl;
return 0;
}
@ -245,7 +262,7 @@ uint8 LoadSpriteV2(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t file_po
* otherwise we can calculate it from the image dimensions. */
uint decomp_size = (type & 0x08) ? FioReadDword() : sprite[zoom_lvl].width * sprite[zoom_lvl].height;
bool valid = DecodeSingleSprite(&sprite[zoom_lvl], file_slot, file_pos, sprite_type, decomp_size, type, zoom_lvl);
bool valid = DecodeSingleSprite(&sprite[zoom_lvl], file_slot, file_pos, sprite_type, decomp_size, type, zoom_lvl, 2);
if (FioGetPos() != start_pos + num) {
WarnCorruptSprite(file_slot, file_pos, __LINE__);
return 0;