/* $Id$ */ /* * 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 base.hpp Base for all blitters. */ #ifndef BLITTER_BASE_HPP #define BLITTER_BASE_HPP #include "../spritecache.h" #include "../spriteloader/spriteloader.hpp" #include "../zoom_type.h" enum BlitterMode { BM_NORMAL, BM_COLOUR_REMAP, BM_TRANSPARENT, }; /** * How all blitters should look like. Extend this class to make your own. */ class Blitter { public: struct BlitterParams { const void *sprite; ///< Pointer to the sprite how ever the encoder stored it const byte *remap; ///< XXX -- Temporary storage for remap array int skip_left, skip_top; ///< How much pixels of the source to skip on the left and top (based on zoom of dst) int width, height; ///< The width and height in pixels that needs to be drawn to dst int sprite_width; ///< Real width of the sprite int sprite_height; ///< Real height of the sprite int left, top; ///< The offset in the 'dst' in pixels to start drawing void *dst; ///< Destination buffer int pitch; ///< The pitch of the destination buffer }; enum PaletteAnimation { PALETTE_ANIMATION_NONE, ///< No palette animation PALETTE_ANIMATION_VIDEO_BACKEND, ///< Palette animation should be done by video backend (8bpp only!) PALETTE_ANIMATION_BLITTER, ///< The blitter takes care of the palette animation }; typedef void *AllocatorProc(size_t size); /** * Get the screen depth this blitter works for. * This is either: 8, 16, 24 or 32. */ virtual uint8 GetScreenDepth() = 0; /** * Draw an image to the screen, given an amount of params defined above. */ virtual void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) = 0; /** * Draw a colourtable to the screen. This is: the colour of the screen is read * and is looked-up in the palette to match a new colour, which then is put * on the screen again. * @param dst the destination pointer (video-buffer). * @param width the width of the buffer. * @param height the height of the buffer. * @param pal the palette to use. */ virtual void DrawColourMappingRect(void *dst, int width, int height, int pal) = 0; /** * Convert a sprite from the loader to our own format. */ virtual Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator) = 0; /** * Move the destination pointer the requested amount x and y, keeping in mind * any pitch and bpp of the renderer. * @param video The destination pointer (video-buffer) to scroll. * @param x How much you want to scroll to the right. * @param y How much you want to scroll to the bottom. * @return A new destination pointer moved the the requested place. */ virtual void *MoveTo(const void *video, int x, int y) = 0; /** * Draw a pixel with a given colour on the video-buffer. * @param video The destination pointer (video-buffer). * @param x The x position within video-buffer. * @param y The y position within video-buffer. * @param colour A 8bpp mapping colour. */ virtual void SetPixel(void *video, int x, int y, uint8 colour) = 0; /** * Draw a pixel with a given colour on the video-buffer if there is currently a black pixel. * @param video The destination pointer (video-buffer). * @param x The x position within video-buffer. * @param y The y position within video-buffer. * @param colour A 8bpp mapping colour. */ virtual void SetPixelIfEmpty(void *video, int x, int y, uint8 colour) = 0; /** * Make a single horizontal line in a single colour on the video-buffer. * @param video The destination pointer (video-buffer). * @param width The length of the line. * @param height The height of the line. * @param colour A 8bpp mapping colour. */ virtual void DrawRect(void *video, int width, int height, uint8 colour) = 0; /** * Draw a line with a given colour. * @param video The destination pointer (video-buffer). * @param x The x coordinate from where the line starts. * @param y The y coordinate from where the line starts. * @param x2 The x coordinate to where the line goes. * @param y2 The y coordinate to where the lines goes. * @param screen_width The width of the screen you are drawing in (to avoid buffer-overflows). * @param screen_height The height of the screen you are drawing in (to avoid buffer-overflows). * @param colour A 8bpp mapping colour. */ virtual void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour) = 0; /** * Copy from a buffer to the screen. * @param video The destionation pointer (video-buffer). * @param src The buffer from which the data will be read. * @param width The width of the buffer. * @param height The height of the buffer. * @note You can not do anything with the content of the buffer, as the blitter can store non-pixel data in it too! */ virtual void CopyFromBuffer(void *video, const void *src, int width, int height) = 0; /** * Copy from the screen to a buffer. * @param video The destination pointer (video-buffer). * @param dst The buffer in which the data will be stored. * @param width The width of the buffer. * @param height The height of the buffer. * @note You can not do anything with the content of the buffer, as the blitter can store non-pixel data in it too! */ virtual void CopyToBuffer(const void *video, void *dst, int width, int height) = 0; /** * Copy from the screen to a buffer in a palette format for 8bpp and RGBA format for 32bpp. * @param video The destination pointer (video-buffer). * @param dst The buffer in which the data will be stored. * @param width The width of the buffer. * @param height The height of the buffer. * @param dst_pitch The pitch (byte per line) of the destination buffer. */ virtual void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) = 0; /** * Scroll the videobuffer some 'x' and 'y' value. * @param video The buffer to scroll into. * @param left The left value of the screen to scroll. * @param top The top value of the screen to scroll. * @param width The width of the screen to scroll. * @param height The height of the screen to scroll. * @param scroll_x How much to scroll in X. * @param scroll_y How much to scroll in Y. */ virtual void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) = 0; /** * Calculate how much memory there is needed for an image of this size in the video-buffer. * @param width The width of the buffer-to-be. * @param height The height of the buffer-to-be. * @return The size needed for the buffer. */ virtual int BufferSize(int width, int height) = 0; /** * Called when the 8bpp palette is changed; you should redraw all pixels on the screen that * are equal to the 8bpp palette indexes 'start' to 'start + count'. * @param start The start index in the 8bpp palette. * @param count The amount of indexes that are (possible) changed. */ virtual void PaletteAnimate(uint start, uint count) = 0; /** * Check if the blitter uses palette animation at all. * @return True if it uses palette animation. */ virtual Blitter::PaletteAnimation UsePaletteAnimation() = 0; /** * Get the name of the blitter, the same as the Factory-instance returns. */ virtual const char *GetName() = 0; /** * Get how many bytes are needed to store a pixel. */ virtual int GetBytesPerPixel() = 0; virtual ~Blitter() { } }; #endif /* BLITTER_BASE_HPP */