(svn r10190) -Codechange: merged renderer and blitter to one single class API: blitter

-Codechange: introduced a hierachy of blitters to avoid a lot of code duplication
 Note: this allows much easier adding other types of video-drivers, like OpenGL

1 files changed, 144 insertions, 0 deletions

diff --git a/src/blitter/base.hpp b/src/blitter/base.hpp
new file mode 100644
index 000000000..66550d42d
--- /dev/null
+++ b/src/blitter/base.hpp
@@ -0,0 +1,144 @@
+/* $Id$ */
+
+#ifndef BLITTER_BASE_HPP
+#define BLITTER_BASE_HPP
+
+#include "../spritecache.h"
+#include "../spriteloader/spriteloader.hpp"
+
+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
+	};
+
+	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 colortable to the screen. This is: the color of the screen is read
+	 *  and is looked-up in the palette to match a new color, 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 DrawColorMappingRect(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 color 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 color A 8bpp mapping color.
+	 */
+	virtual void SetPixel(void *video, int x, int y, uint8 color) = 0;
+
+	/**
+	 * Draw a pixel with a given color 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 color A 8bpp mapping color.
+	 */
+	virtual void SetPixelIfEmpty(void *video, int x, int y, uint8 color) = 0;
+
+	/**
+	 * Make a single horizontal line in a single color on the video-buffer.
+	 * @param video The destination pointer (video-buffer).
+	 * @param width The lenght of the line.
+	 * @param color A 8bpp mapping color.
+	 */
+	virtual void SetHorizontalLine(void *video, int width, uint8 color) = 0;
+
+	/**
+	 * Draw a line in which ever direction.
+	 */
+	virtual void DrawLine(void *video, int x, int y, int x2, int y2, uint8 color) = 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.
+	 * @param src_pitch The pitch (byte per line) of the source buffer.
+	 */
+	virtual void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch) = 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.
+	 * @param dst_pitch The pitch (byte per line) of the destination buffer.
+	 */
+	virtual void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) = 0;
+
+	/**
+	 * Move the videobuffer some places (via memmove).
+	 * @param video_dst The destination pointer (video-buffer).
+	 * @param video_src The source pointer (video-buffer).
+	 * @param width The width of the buffer to move.
+	 * @param height The height of the buffer to move.
+	 */
+	virtual void MoveBuffer(void *video_dst, const void *video_src, int width, int height) = 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;
+
+	virtual ~Blitter() { }
+};
+
+#endif /* BLITTER_BASE_HPP */