forked from Lephenixnoir/gint
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
//---
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//
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// gint drawing module: bopti
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//
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// This module is a powerful bitmap renderer. It *heavily* relies on the
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// line-based structure of the video RAM as well as the high density of
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// information. A single CPU access (longword operation) can affect 32
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// pixels at once, which is crucial for performance. The same goes for all
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// other drawing modules, but this one typically has 350 lines of code
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// just to wrap these longword accesses -- and it's blazingly fast.
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//
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//---
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#ifndef _BOPTI_H
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#define _BOPTI_H
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/*
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image_t
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This structure holds meta-data of a bitmap encoded with fxconv. Data is
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accessed using longword operations for performance considerations,
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which requires that the all fields of the structure be properly aligned
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and of a correct size.
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*/
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typedef struct
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{
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uint8_t magic;
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uint8_t format;
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uint8_t width;
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uint8_t height;
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const uint32_t data[];
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} __attribute__((packed, aligned(4))) image_t;
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/*
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dimage()
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Displays a monochrome image in the vram. This function does a real lot
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of optimization.
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*/
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void dimage(int x, int y, image_t *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(
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int x, int y,
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image_t *img,
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int left, int top, int width, int height
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);
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/*
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gimage()
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Displays a gray image in the dual-vram.
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*/
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void gimage(int x, int y, image_t *image);
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/*
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gimage_part()
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Draws a portion of a gray 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 gimage_part(
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int x, int y,
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image_t *image,
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int left, int top, int width, int height
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);
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#endif // _BOPTI_H
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