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gdi32: Calculate the min/max color component intensities for 17 glyph levels.

This commit is contained in:
Huw Davies 2011-11-14 12:49:05 +00:00 committed by Alexandre Julliard
parent f284f5970a
commit 18520f2e63
3 changed files with 57 additions and 0 deletions
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1
dlls/gdi32/dibdrv/dc.c
View File

@ -528,6 +528,7 @@ static COLORREF dibdrv_SetTextColor( PHYSDEV dev, COLORREF color )
dibdrv_physdev *pdev = get_dibdrv_pdev(dev);
pdev->text_color = get_pixel_color( pdev, color, TRUE );
update_aa_ranges( pdev );
return next->funcs->pSetTextColor( next, color );
}

9
dlls/gdi32/dibdrv/dibdrv.h
View File

@ -67,6 +67,13 @@ typedef struct
void *xor;
} rop_mask_bits;
struct intensity_range
{
BYTE r_min, r_max;
BYTE g_min, g_max;
BYTE b_min, b_max;
};
typedef struct dibdrv_physdev
{
struct gdi_physdev dev;
@ -100,6 +107,7 @@ typedef struct dibdrv_physdev
/* text */
DWORD text_color;
struct intensity_range glyph_intensities[17];
} dibdrv_physdev;
#define DEFER_FORMAT 1
@ -218,6 +226,7 @@ extern HRGN add_extra_clipping_region( dibdrv_physdev *pdev, HRGN rgn ) DECLSPEC
extern void restore_clipping_region( dibdrv_physdev *pdev, HRGN rgn ) DECLSPEC_HIDDEN;
extern int clip_line(const POINT *start, const POINT *end, const RECT *clip,
const bres_params *params, POINT *pt1, POINT *pt2) DECLSPEC_HIDDEN;
extern void update_aa_ranges( dibdrv_physdev *pdev ) DECLSPEC_HIDDEN;
static inline BOOL defer_pen(dibdrv_physdev *pdev)
{

47
dlls/gdi32/dibdrv/graphics.c
View File

@ -56,6 +56,53 @@ static RECT get_device_rect( HDC hdc, int left, int top, int right, int bottom,
return rect;
}
/* Intensities of the 17 glyph levels when drawn with text component of 0xff on a
black bkgnd. [A log-log plot of these data gives: y = 77.05 * x^0.4315]. */
static const BYTE ramp[17] =
{
0, 0x4d, 0x68, 0x7c,
0x8c, 0x9a, 0xa7, 0xb2,
0xbd, 0xc7, 0xd0, 0xd9,
0xe1, 0xe9, 0xf0, 0xf8,
0xff
};
/* For a give text-color component and a glyph level, calculate the
range of dst intensities, the min/max corresponding to 0/0xff bkgnd
components respectively.
The minimum is a linear interpolation between 0 and the value in
the ramp table.
The maximum is a linear interpolation between the value from the
ramp table read in reverse and 0xff.
To find the resulting pixel intensity, we note that if the text and
bkgnd intensities are the same then the result must be that
intensity. Otherwise we linearly interpolate between either the
min or the max value and this intermediate value depending on which
side of the inequality we lie.
*/
static inline void get_range( BYTE aa, DWORD text_comp, BYTE *min_comp, BYTE *max_comp )
{
*min_comp = (ramp[aa] * text_comp) / 0xff;
*max_comp = ramp[16 - aa] + ((0xff - ramp[16 - aa]) * text_comp) / 0xff;
}
void update_aa_ranges( dibdrv_physdev *pdev )
{
int i;
COLORREF text = pdev->dib.funcs->pixel_to_colorref( &pdev->dib, pdev->text_color );
for (i = 0; i < 17; i++)
{
get_range( i, GetRValue(text), &pdev->glyph_intensities[i].r_min, &pdev->glyph_intensities[i].r_max );
get_range( i, GetGValue(text), &pdev->glyph_intensities[i].g_min, &pdev->glyph_intensities[i].g_max );
get_range( i, GetBValue(text), &pdev->glyph_intensities[i].b_min, &pdev->glyph_intensities[i].b_max );
}
}
/**********************************************************************
* get_text_bkgnd_masks
*