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/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file grf.cpp Reading graphics data from (New)GRF files. */
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#include "../stdafx.h"
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#include "../gfx_func.h"
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#include "../fileio_func.h"
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#include "../debug.h"
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#include "../strings_func.h"
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#include "table/strings.h"
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#include "../gui.h"
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#include "grf.hpp"
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/**
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* We found a corrupted sprite. This means that the sprite itself
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* contains invalid data or is too small for the given dimensions.
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* @param file_slot the file the errored sprite is in
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* @param file_pos the location in the file of the errored sprite
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* @param line the line where the error occurs.
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* @return always false (to tell loading the sprite failed)
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*/
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static bool WarnCorruptSprite(uint8 file_slot, size_t file_pos, int line)
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{
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static byte warning_level = 0;
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if (warning_level == 0) {
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SetDParamStr(0, FioGetFilename(file_slot));
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ShowErrorMessage(STR_NEWGRF_ERROR_CORRUPT_SPRITE, INVALID_STRING_ID, 0, 0);
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}
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DEBUG(sprite, warning_level, "[%i] Loading corrupted sprite from %s at position %i", line, FioGetFilename(file_slot), (int)file_pos);
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warning_level = 6;
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return false;
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}
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bool SpriteLoaderGrf::LoadSprite(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t file_pos, SpriteType sprite_type)
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{
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/* Open the right file and go to the correct position */
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FioSeekToFile(file_slot, file_pos);
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/* Read the size and type */
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int num = FioReadWord();
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byte type = FioReadByte();
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/* Type 0xFF indicates either a colourmap or some other non-sprite info; we do not handle them here */
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if (type == 0xFF) return false;
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sprite->height = FioReadByte();
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sprite->width = FioReadWord();
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sprite->x_offs = FioReadWord();
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sprite->y_offs = FioReadWord();
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/* 0x02 indicates it is a compressed sprite, so we can't rely on 'num' to be valid.
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* In case it is uncompressed, the size is 'num' - 8 (header-size). */
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num = (type & 0x02) ? sprite->width * sprite->height : num - 8;
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byte *dest_orig = AllocaM(byte, num);
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byte *dest = dest_orig;
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const int dest_size = num;
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/* Read the file, which has some kind of compression */
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while (num > 0) {
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int8 code = FioReadByte();
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if (code >= 0) {
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/* Plain bytes to read */
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int size = (code == 0) ? 0x80 : code;
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num -= size;
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if (num < 0) return WarnCorruptSprite(file_slot, file_pos, __LINE__);
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for (; size > 0; size--) {
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*dest = FioReadByte();
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dest++;
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}
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} else {
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/* Copy bytes from earlier in the sprite */
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const uint data_offset = ((code & 7) << 8) | FioReadByte();
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if (dest - data_offset < dest_orig) return WarnCorruptSprite(file_slot, file_pos, __LINE__);
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int size = -(code >> 3);
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num -= size;
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if (num < 0) return WarnCorruptSprite(file_slot, file_pos, __LINE__);
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for (; size > 0; size--) {
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*dest = *(dest - data_offset);
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dest++;
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}
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}
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}
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if (num != 0) return WarnCorruptSprite(file_slot, file_pos, __LINE__);
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sprite->AllocateData(sprite->width * sprite->height);
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/* When there are transparency pixels, this format has an other trick.. decode it */
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/* When there are transparency pixels, this format has another trick.. decode it */
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if (type & 0x08) {
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for (int y = 0; y < sprite->height; y++) {
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bool last_item = false;
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/* Look up in the header-table where the real data is stored for this row */
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int offset = (dest_orig[y * 2 + 1] << 8) | dest_orig[y * 2];
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/* Go to that row */
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dest = dest_orig + offset;
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do {
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if (dest + 2 > dest_orig + dest_size) {
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free(sprite->data);
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return WarnCorruptSprite(file_slot, file_pos, __LINE__);
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}
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SpriteLoader::CommonPixel *data;
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/* Read the header:
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* 0 .. 14 - length
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* 15 - last_item
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* 16 .. 31 - transparency bytes */
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last_item = ((*dest) & 0x80) != 0;
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int length = (*dest++) & 0x7F;
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int skip = *dest++;
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data = &sprite->data[y * sprite->width + skip];
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if (skip + length > sprite->width || dest + length > dest_orig + dest_size) {
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free(sprite->data);
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return WarnCorruptSprite(file_slot, file_pos, __LINE__);
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}
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for (int x = 0; x < length; x++) {
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switch (sprite_type) {
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case ST_NORMAL: data->m = _palette_remap_grf[file_slot] ? _palette_remap[*dest] : *dest; break;
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case ST_FONT: data->m = min(*dest, 2u); break;
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default: data->m = *dest; break;
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}
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dest++;
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data++;
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}
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} while (!last_item);
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}
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} else {
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if (dest_size < sprite->width * sprite->height) {
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free(sprite->data);
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return WarnCorruptSprite(file_slot, file_pos, __LINE__);
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}
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if (dest_size > sprite->width * sprite->height) {
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static byte warning_level = 0;
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DEBUG(sprite, warning_level, "Ignoring %i unused extra bytes from the sprite from %s at position %i", dest_size - sprite->width * sprite->height, FioGetFilename(file_slot), (int)file_pos);
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warning_level = 6;
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}
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dest = dest_orig;
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for (int i = 0; i < sprite->width * sprite->height; i++) {
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switch (sprite_type) {
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case ST_NORMAL: sprite->data[i].m = _palette_remap_grf[file_slot] ? _palette_remap[dest[i]] : dest[i]; break;
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case ST_FONT: sprite->data[i].m = min(dest[i], 2u); break;
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default: sprite->data[i].m = dest[i]; break;
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}
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}
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}
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/* Make sure to mark all transparent pixels transparent on the alpha channel too */
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for (int i = 0; i < sprite->width * sprite->height; i++)
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if (sprite->data[i].m != 0) sprite->data[i].a = 0xFF;
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return true;
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}
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