/* $Id$ */

/*
 * 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 gfx.cpp Handling of drawing text and other gfx related stuff. */

#include "stdafx.h"
#include "gfx_func.h"
#include "variables.h"
#include "fontcache.h"
#include "genworld.h"
#include "zoom_func.h"
#include "blitter/factory.hpp"
#include "video/video_driver.hpp"
#include "strings_func.h"
#include "settings_type.h"
#include "landscape_type.h"
#include "network/network.h"
#include "network/network_func.h"
#include "thread/thread.h"
#include "window_func.h"

#include "table/palettes.h"
#include "table/sprites.h"
#include "table/control_codes.h"

byte _dirkeys;        ///< 1 = left, 2 = up, 4 = right, 8 = down
bool _fullscreen;
CursorVars _cursor;
bool _ctrl_pressed;   ///< Is Ctrl pressed?
bool _shift_pressed;  ///< Is Shift pressed?
byte _fast_forward;
bool _left_button_down;     ///< Is left mouse button pressed?
bool _left_button_clicked;  ///< Is left mouse button clicked?
bool _right_button_down;    ///< Is right mouse button pressed?
bool _right_button_clicked; ///< Is right mouse button clicked?
DrawPixelInfo _screen;
bool _screen_disable_anim = false;   ///< Disable palette animation (important for 32bpp-anim blitter during giant screenshot)
bool _exit_game;
GameMode _game_mode;
SwitchMode _switch_mode;  ///< The next mainloop command.
PauseModeByte _pause_mode;
int _pal_first_dirty;
int _pal_count_dirty;

Colour _cur_palette[256];

static int _max_char_height; ///< Cache of the height of the largest font
static int _max_char_width;  ///< Cache of the width of the largest font
static byte _stringwidth_table[FS_END][224]; ///< Cache containing width of often used characters. @see GetCharacterWidth()
DrawPixelInfo *_cur_dpi;
byte _colour_gradient[COLOUR_END][8];

static void GfxMainBlitter(const Sprite *sprite, int x, int y, BlitterMode mode, const SubSprite *sub = NULL);

FontSize _cur_fontsize;
static FontSize _last_fontsize;
static ReusableBuffer<uint8> _cursor_backup;

/**
 * The rect for repaint.
 *
 * This rectangle defines the area which should be repaint by the video driver.
 *
 * @ingroup dirty
 */
static Rect _invalid_rect;
static const byte *_colour_remap_ptr;
static byte _string_colourremap[3]; ///< Recoloursprite for stringdrawing. The grf loader ensures, that ST_FONT sprites only use colours 0 to 2.

enum {
	DIRTY_BLOCK_HEIGHT   = 8,
	DIRTY_BLOCK_WIDTH    = 64,
};
static uint _dirty_bytes_per_line = 0;
static byte *_dirty_blocks = NULL;

void GfxScroll(int left, int top, int width, int height, int xo, int yo)
{
	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();

	if (xo == 0 && yo == 0) return;

	if (_cursor.visible) UndrawMouseCursor();

#ifdef ENABLE_NETWORK
	if (_networking) NetworkUndrawChatMessage();
#endif /* ENABLE_NETWORK */

	blitter->ScrollBuffer(_screen.dst_ptr, left, top, width, height, xo, yo);
	/* This part of the screen is now dirty. */
	_video_driver->MakeDirty(left, top, width, height);
}


/**
 * Applies a certain FillRectMode-operation to a rectangle [left, right] x [top, bottom] on the screen.
 *
 * @pre dpi->zoom == ZOOM_LVL_NORMAL, right >= left, bottom >= top
 * @param left Minimum X (inclusive)
 * @param top Minimum Y (inclusive)
 * @param right Maximum X (inclusive)
 * @param bottom Maximum Y (inclusive)
 * @param colour A 8 bit palette index (FILLRECT_OPAQUE and FILLRECT_CHECKER) or a recolour spritenumber (FILLRECT_RECOLOUR)
 * @param mode
 *         FILLRECT_OPAQUE:   Fill the rectangle with the specified colour
 *         FILLRECT_CHECKER:  Like FILLRECT_OPAQUE, but only draw every second pixel (used to grey out things)
 *         FILLRECT_RECOLOUR:  Apply a recolour sprite to every pixel in the rectangle currently on screen
 */
void GfxFillRect(int left, int top, int right, int bottom, int colour, FillRectMode mode)
{
	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
	const DrawPixelInfo *dpi = _cur_dpi;
	void *dst;
	const int otop = top;
	const int oleft = left;

	if (dpi->zoom != ZOOM_LVL_NORMAL) return;
	if (left > right || top > bottom) return;
	if (right < dpi->left || left >= dpi->left + dpi->width) return;
	if (bottom < dpi->top || top >= dpi->top + dpi->height) return;

	if ( (left -= dpi->left) < 0) left = 0;
	right = right - dpi->left + 1;
	if (right > dpi->width) right = dpi->width;