Initial commit

engines/m4/platform/tile/tile_read.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "m4/platform/tile/tile_read.h"
+#include "m4/core/errors.h"
+#include "m4/graphics/gr_buff.h"
+#include "m4/mem/memman.h"
+
+namespace M4 {
+
+void tt_read_header(SysFile *ifp, int32 *file_x, int32 *file_y,
+	int32 *num_x_tiles, int32 *num_y_tiles, int32 *tile_x, int32 *tile_y, RGB8 *pal) {
+	int32 value;
+
+	// Initalize return parameters
+	*num_x_tiles = 0;
+	*num_y_tiles = 0;
+	*tile_x = 0;
+	*tile_y = 0;
+	*file_x = 0;
+	*file_y = 0;
+
+	// Open file
+	if (!ifp->exists())
+		error_show(FL, 'FNF!', ".TT file");
+
+	ifp->readUint32LE();	// skip chunk ID
+	ifp->readUint32LE();	// skip chunk size
+
+	*file_x = ifp->readSint32LE();
+	*file_y = ifp->readSint32LE();
+	*num_x_tiles = ifp->readSint32LE();
+	*num_y_tiles = ifp->readSint32LE();
+	*tile_x = ifp->readSint32LE();
+	*tile_y = ifp->readSint32LE();
+
+	// Write color table
+	for (int i = 0; i < 256; i++) {
+		value = ifp->readSint32LE();
+
+		pal[i].r = (value >> 16) & 0x0ff;
+		pal[i].g = (value >> 8) & 0x0ff;
+		pal[i].b = (value) & 0x0ff;
+	}
+}
+
+Buffer *tt_read(SysFile *ifp, int index, int32 tile_x, int32 tile_y) {
+	int32 tile_size;
+	int offset;
+	Buffer *out = (Buffer *)mem_alloc(sizeof(Buffer), "tile buffer");
+
+	if (!out)
+		error_show(FL, 'OOM!', "fail to allocate mem for buffer structure");
+
+	out->data = nullptr;
+	out->w = 0;
+	out->stride = 0;
+	out->h = 0;
+
+	// Check parameters
+	if (index < 0)
+		error_show(FL, 'TILI');
+
+	tile_size = tile_x * tile_y;
+
+	if (index == 0) {
+		// First tile data
+		if (!ifp->exists())
+			error_show(FL, 'FNF!', ".TT file");
+
+		// Read data of tiles to file
+		offset = index * tile_size + 256 * 4 + 32; // Get rid of color table and header stuff
+		ifp->seek((uint32)offset);
+	}
+
+	gr_buffer_init(out, "back tile", tile_x, tile_y);
+	if (out->data == nullptr) {
+		out->w = 0;
+		out->stride = 0;
+		out->h = 0;
+		error_show(FL, 'OOM!', "fail to allocate mem for .TT buffer");
+		return out;
+	}
+
+	out->w = out->stride = tile_x;
+	out->h = tile_y;
+
+	ifp->read(out->data, tile_size);
+
+	return out;
+}
+
+} // End of namespace M4