72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* Copyright (c) 2014, 2015, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* framebuffer.c
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* Framebuffer functions.
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include "framebuffer.h"
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#include "pixel.h"
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struct framebuffer framebuffer_crop(struct framebuffer fb,
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size_t left,
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size_t top,
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size_t width,
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size_t height)
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{
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// Crop the framebuffer horizontally.
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if ( fb.xres < left )
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left = fb.xres;
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fb.buffer += left;
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fb.xres -= left;
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if ( width < fb.xres )
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fb.xres = width;
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// Crop the framebuffer vertically.
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if ( fb.yres < top )
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top = fb.yres;
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fb.buffer += top * fb.pitch;
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fb.yres -= top;
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if ( height < fb.yres )
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fb.yres = height;
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return fb;
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}
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void framebuffer_copy_to_framebuffer(const struct framebuffer dst,
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const struct framebuffer src)
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{
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for ( size_t y = 0; y < src.yres; y++ )
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for ( size_t x = 0; x < src.xres; x++ )
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framebuffer_set_pixel(dst, x, y, framebuffer_get_pixel(src, x, y));
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}
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void framebuffer_copy_to_framebuffer_blend(const struct framebuffer dst,
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const struct framebuffer src)
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{
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for ( size_t y = 0; y < src.yres; y++ )
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{
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for ( size_t x = 0; x < src.xres; x++ )
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{
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uint32_t bg = framebuffer_get_pixel(dst, x, y);
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uint32_t fg = framebuffer_get_pixel(src, x, y);
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framebuffer_set_pixel(dst, x, y, blend_pixel(bg, fg));
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}
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}
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}
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