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161 lines
3.1 KiB
C
161 lines
3.1 KiB
C
//---
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//
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// gint drawing module: display
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//
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// Handles vram manipulation and drawing for plain monochrome display.
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//
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//---
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#ifndef _DISPLAY_H
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#define _DISPLAY_H 1
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//---
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// Heading declarations.
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//---
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enum Color
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{
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Color_White = 0,
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Color_Light = 1,
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Color_Dark = 2,
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Color_Black = 3,
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Color_None = 4,
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Color_Invert = 5,
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};
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// This header needs enum Color to be defined.
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#include <tales.h>
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/*
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struct Image
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This structure holds information about a bitmap encoded with fxconv.
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Data is accessed using longword operations, which *requires* many
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sizes to be multiples of 4 (structure alignment, data alignment, layer
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size, ...).
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*/
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struct Image
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{
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unsigned char magic;
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unsigned char format;
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unsigned char width;
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unsigned char height;
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const unsigned char __attribute__((aligned(4))) data[];
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} __attribute__((aligned(4)));
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// Useful shorthand for user code.
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typedef struct Image Image;
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// A few other constants.
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#define DISPLAY_WIDTH 128
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#define DISPLAY_HEIGHT 64
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//---
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// Generic functions.
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//---
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/*
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display_getLocalVRAM()
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Returns the local video ram address. This function always return the
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same address.
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The buffer returned by this function should not be used directly when
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running the gray engine.
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*/
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void *display_getLocalVRAM(void);
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/*
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display_getCurrentVRAM()
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Returns the current video ram. This function usually returns the
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parameter of the last call to display_useVRAM(), unless the gray engine
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is running (in which case the result is undefined). Returns the local
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vram address by default.
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*/
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void *display_getCurrentVRAM(void);
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/*
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display_useVRAM()
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Changes the current video ram address. The argument MUST be a 4-
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aligned 1024-byte buffer; otherwise any drawing operation will crash
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the program.
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This function will most likely have no effect when running the gray
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engine.
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*/
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void display_useVRAM(void *vram);
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//---
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// Global drawing functions.
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//---
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/*
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dupdate()
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Displays the vram on the physical screen. Does nothing when the gray
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engine is running.
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*/
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void dupdate(void);
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/*
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dclear()
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Clears the whole video ram.
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*/
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void dclear(void);
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/*
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dclear_area()
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Clears an area of the video ram. Both (x1, y1) and (x2, y2) are
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cleared.
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*/
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void dclear_area(int x1, int y1, int x2, int y2);
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/*
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dreverse_area()
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Reverses an area of the vram. (x1, y1) and (x2, y2) are reversed as
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well.
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*/
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void dreverse_area(int x1, int y1, int x2, int y2);
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//---
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// Local drawing functions.
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//---
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/*
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dpixel()
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Puts a pixel in the vram.
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*/
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void dpixel(int x, int y, enum Color color);
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/*
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dline()
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Draws a line in the vram. Automatically optimizes horizontal and
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vertical lines.
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Uses an algorithm written by PierrotLL for MonochromeLib.
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*/
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void dline(int x1, int y1, int x2, int y2, enum Color color);
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/*
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dimage()
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Displays a monochrome image in the vram. Does a real lot of
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optimization.
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*/
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void dimage(int x, int y, struct Image *image);
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/*
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dimage_part()
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Draws a portion of an image, defined by its bounding rectangle.
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Point (left, top) is included, but (left + width, top + height) is
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excluded.
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*/
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void dimage_part(int x, int y, struct Image *img, int left, int top,
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int width, int height);
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#endif // _DISPLAY_H
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