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Coldfire: Fix alpha bitmap drawing from messing up the emac status register.

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It failed to restore macsr to the expected default (FRAC/SAT) which caused DSP
functions like tone control filter calculation to fail (resulting in noise).
The FFT plugin was also affected.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31589 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2012-01-05 23:00:14 +00:00
parent c6dcec4e0d
commit 302937e586
2 changed files with 16 additions and 1 deletions
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13
firmware/drivers/lcd-16bit-common.c
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@ -606,6 +606,7 @@ void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int heig
#define ALPHA_COLOR_PIXEL_PER_WORD (32 >> ALPHA_COLOR_FONT_DEPTH)
#ifdef CPU_ARM
#define BLEND_INIT do {} while (0)
#define BLEND_FINISH do {} while(0)
#define BLEND_START(acc, color, alpha) \
asm volatile("mul %0, %1, %2" : "=&r" (acc) : "r" (color), "r" (alpha))
#define BLEND_CONT(acc, color, alpha) \
@ -613,13 +614,18 @@ void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int heig
#define BLEND_OUT(acc) do {} while (0)
#elif defined(CPU_COLDFIRE)
#define ALPHA_BITMAP_READ_WORDS
#define BLEND_INIT coldfire_set_macsr(EMAC_UNSIGNED)
#define BLEND_INIT \
unsigned long _macsr = coldfire_get_macsr(); \
coldfire_set_macsr(EMAC_UNSIGNED)
#define BLEND_FINISH \
coldfire_set_macsr(_macsr)
#define BLEND_START(acc, color, alpha) \
asm volatile("mac.l %0, %1, %%acc0" :: "%d" (color), "d" (alpha))
#define BLEND_CONT BLEND_START
#define BLEND_OUT(acc) asm volatile("movclr.l %%acc0, %0" : "=d" (acc))
#else
#define BLEND_INIT do {} while (0)
#define BLEND_FINISH do {} while(0)
#define BLEND_START(acc, color, alpha) ((acc) = (color) * (alpha))
#define BLEND_CONT(acc, color, alpha) ((acc) += (color) * (alpha))
#define BLEND_OUT(acc) do {} while (0)
@ -701,7 +707,10 @@ static void ICODE_ATTR lcd_alpha_bitmap_part_mix(const fb_data* image,
/* nothing to draw? */
if ((x >= LCD_WIDTH) || (y >= LCD_HEIGHT)
|| (x + width <= 0) || (y + height <= 0))
{
BLEND_FINISH;
return;
}
/* clip image in viewport in screen */
if (x < 0)
@ -908,6 +917,8 @@ static void ICODE_ATTR lcd_alpha_bitmap_part_mix(const fb_data* image,
}
#endif
} while (--row);
BLEND_FINISH;
}
/* Draw a full native bitmap */