mirror of
https://github.com/isometimes/rpi4-osdev
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52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
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#include "wgt.h"
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#include "include/mem.h"
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#define fastcopy memcpy
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void wflipblock (block image, short direction)
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{
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int width,height;
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int ctr,ctr2;
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block temp, temp2;
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unsigned int *pr2;
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width = wgetblockwidth (image); /* Find width and height of block */
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height = wgetblockheight (image);
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temp = malloc (width*4);
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temp2 = malloc (width*4);
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image += 4;
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if (direction == 1) /* Horizontal flip */
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{
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for (ctr = 1; ctr <= height; ctr++)
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/* Use each row */
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{
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fastcopy (temp, image, width);
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/* Copy row to buffer */
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for (ctr2 = 0; ctr2 <= width - 1; ctr2++)
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temp2[width - 1 - ctr2] = temp[ctr2];
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/* Reverse elements
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to another buffer */
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fastcopy (image, temp2, width); /* Copy back to original block */
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image += width; /* Advance pr to next row */
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}
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}
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else if (direction == 0) /* Vertical flip */
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{
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pr2 = image + (height*width) - width; /* pr2 points to last row */
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for (ctr = 1; ctr <= (height / 2); ctr++)
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/* Only flip halfway */
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{
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fastcopy (temp, image, width); /* Get row of image data */
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fastcopy (image, pr2, width); /* Copy last row to first */
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fastcopy (pr2, temp, width); /* Put first row on last */
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image += width; /* Move to next row */
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pr2 -= width; /* Decrement last row */
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}
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}
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free (temp);
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free (temp2);
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}
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