47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
//---
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// display:fx - Internal definitions for the display module on fx9860g
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//---
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#ifndef DISPLAY_FX
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#define DISPLAY_FX
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#include <gint/defs/types.h>
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#include <gint/display.h>
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/* masks() - compute the vram masks for a given rectangle
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Since the VRAM is line-based with four uin32_t elements per row, we can
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execute any operation on a rectangle by running it on each set of four
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uint32_t elements.
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This function calculates four uint32_t values and stores them in @mask. Each
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of the 128 bits in this array represents a column of the screen, and the bit
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of column c is 1 iff x1 <= c <= x2.
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These masks can then be and-ed/or-ed/anything on the VRAM to draw.
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@x1 @x2 Targeted screen range, horizontally (both included)
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@masks Stores the result of the function (four uint32_t values) */
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void masks(int x1, int x2, uint32_t *masks);
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/* bopti_render_clip() - render a bopti image with clipping
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@x @y Location of the top-left corner
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@img Image encoded by [fxconv]
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@left @top @w @h Bounding box to render */
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void bopti_render_clip(int x, int y, image_t const *img, int left, int top,
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int w, int h);
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/* bopti_render_noclip() - render a bopti image without clipping
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This function is only ever slightly faster than bopti_render_clip(),
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eliminating two types of coordinate checks:
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1. The bounding box does not overflow from the image
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2. The final rendering does not overflow from the screen
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@x @y Location of the top-left corner
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@img Image encoded by [fxconv]
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@left @top @w @h Bounding box to render */
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void bopti_render_noclip(int x, int y, image_t const *img, int left, int top,
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int w, int h);
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#endif /* DISPLAY_FX */
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