[PATCH v2 1/2] gdi32: Support the subpixel rendering gamma. correction.
Byeongsik Jeon
bsjeon at hanmail.net
Mon Oct 15 08:12:30 CDT 2018
Signed-off-by: Byeongsik Jeon <bsjeon at hanmail.net>
---
v2: Fix the void *, thread safety.
dlls/gdi32/dc.c | 2 ++
dlls/gdi32/dibdrv/dibdrv.h | 8 +++++-
dlls/gdi32/dibdrv/graphics.c | 19 +++++++++----
dlls/gdi32/dibdrv/primitives.c | 49 +++++++++++++++++++++++++---------
dlls/gdi32/font.c | 37 +++++++++++++++++++++++++
dlls/gdi32/gdi_private.h | 9 +++++++
6 files changed, 106 insertions(+), 18 deletions(-)
diff --git a/dlls/gdi32/dc.c b/dlls/gdi32/dc.c
index 892d3e9744..de01bf4d3d 100644
--- a/dlls/gdi32/dc.c
+++ b/dlls/gdi32/dc.c
@@ -86,6 +86,7 @@ static void set_initial_dc_state( DC *dc )
dc->vport_ext.cy = 1;
dc->miterLimit = 10.0f; /* 10.0 is the default, from MSDN */
dc->layout = 0;
+ dc->font_gamma = NULL;
dc->font_code_page = CP_ACP;
dc->ROPmode = R2_COPYPEN;
dc->polyFillMode = ALTERNATE;
@@ -168,6 +169,7 @@ static void free_dc_state( DC *dc )
if (dc->hVisRgn) DeleteObject( dc->hVisRgn );
if (dc->region) DeleteObject( dc->region );
if (dc->path) free_gdi_path( dc->path );
+ HeapFree( GetProcessHeap(), 0, dc->font_gamma );
HeapFree( GetProcessHeap(), 0, dc );
}
diff --git a/dlls/gdi32/dibdrv/dibdrv.h b/dlls/gdi32/dibdrv/dibdrv.h
index f79f5b0867..5776490bd4 100644
--- a/dlls/gdi32/dibdrv/dibdrv.h
+++ b/dlls/gdi32/dibdrv/dibdrv.h
@@ -85,6 +85,12 @@ struct intensity_range
BYTE b_min, b_max;
};
+union font_intensities
+{
+ struct intensity_range *ranges;
+ struct font_gamma_table *gamma;
+};
+
typedef struct dibdrv_physdev
{
struct gdi_physdev dev;
@@ -192,7 +198,7 @@ typedef struct primitive_funcs
void (* draw_glyph)(const dib_info *dst, const RECT *rc, const dib_info *glyph,
const POINT *origin, DWORD text_pixel, const struct intensity_range *ranges);
void (* draw_subpixel_glyph)(const dib_info *dst, const RECT *rc, const dib_info *glyph,
- const POINT *origin, DWORD text_pixel );
+ const POINT *origin, DWORD text_pixel, const struct font_gamma_table *gamma);
DWORD (* get_pixel)(const dib_info *dib, int x, int y);
DWORD (* colorref_to_pixel)(const dib_info *dib, COLORREF color);
COLORREF (* pixel_to_colorref)(const dib_info *dib, DWORD pixel);
diff --git a/dlls/gdi32/dibdrv/graphics.c b/dlls/gdi32/dibdrv/graphics.c
index 08f8c3d6d2..a6d108576f 100644
--- a/dlls/gdi32/dibdrv/graphics.c
+++ b/dlls/gdi32/dibdrv/graphics.c
@@ -683,7 +683,7 @@ static inline void get_text_bkgnd_masks( DC *dc, const dib_info *dib, rop_mask *
static void draw_glyph( dib_info *dib, int x, int y, const GLYPHMETRICS *metrics,
const dib_info *glyph_dib, DWORD text_color,
- const struct intensity_range *ranges, const struct clipped_rects *clipped_rects,
+ const union font_intensities lut, const struct clipped_rects *clipped_rects,
RECT *bounds )
{
int i;
@@ -705,10 +705,10 @@ static void draw_glyph( dib_info *dib, int x, int y, const GLYPHMETRICS *metrics
if (glyph_dib->bit_count == 32)
dib->funcs->draw_subpixel_glyph( dib, &clipped_rect, glyph_dib, &src_origin,
- text_color );
+ text_color, lut.gamma );
else
dib->funcs->draw_glyph( dib, &clipped_rect, glyph_dib, &src_origin,
- text_color, ranges );
+ text_color, lut.ranges );
}
}
}
@@ -817,6 +817,7 @@ static void render_string( DC *dc, dib_info *dib, struct cached_font *font, INT
dib_info glyph_dib;
DWORD text_color;
struct intensity_range ranges[17];
+ union font_intensities lut = { NULL };
glyph_dib.bit_count = get_glyph_depth( font->aa_flags );
glyph_dib.rect.left = 0;
@@ -826,8 +827,16 @@ static void render_string( DC *dc, dib_info *dib, struct cached_font *font, INT
text_color = get_pixel_color( dc, dib, dc->textColor, TRUE );
- if (glyph_dib.bit_count == 8)
+ switch ( glyph_dib.bit_count )
+ {
+ case 8:
get_aa_ranges( dib->funcs->pixel_to_colorref( dib, text_color ), ranges );
+ lut.ranges = ranges;
+ break;
+ case 32:
+ lut.gamma = dc->font_gamma;
+ break;
+ }
for (i = 0; i < count; i++)
{
@@ -841,7 +850,7 @@ static void render_string( DC *dc, dib_info *dib, struct cached_font *font, INT
glyph_dib.stride = get_dib_stride( glyph->metrics.gmBlackBoxX, glyph_dib.bit_count );
glyph_dib.bits.ptr = glyph->bits;
- draw_glyph( dib, x, y, &glyph->metrics, &glyph_dib, text_color, ranges, clipped_rects, bounds );
+ draw_glyph( dib, x, y, &glyph->metrics, &glyph_dib, text_color, lut, clipped_rects, bounds );
if (dx)
{
diff --git a/dlls/gdi32/dibdrv/primitives.c b/dlls/gdi32/dibdrv/primitives.c
index 0d097b2da6..ca80e4d8f6 100644
--- a/dlls/gdi32/dibdrv/primitives.c
+++ b/dlls/gdi32/dibdrv/primitives.c
@@ -6272,16 +6272,35 @@ static void draw_glyph_null( const dib_info *dib, const RECT *rect, const dib_in
{
return;
}
+static inline BYTE blend_color_gamma( BYTE dst, BYTE text, BYTE alpha,
+ const struct font_gamma_table *gamma )
+{
+ if ( alpha == 0 ) return dst;
+ if ( alpha == 255 ) return text;
+ if ( dst == text ) return dst;
+
+ return gamma->encode[ blend_color( gamma->decode[dst],
+ gamma->decode[text],
+ alpha) ];
+}
-static inline DWORD blend_subpixel( BYTE r, BYTE g, BYTE b, DWORD text, DWORD alpha )
+static inline DWORD blend_subpixel( BYTE r, BYTE g, BYTE b, DWORD text, DWORD alpha,
+ const struct font_gamma_table *gamma )
{
+ if ( gamma != NULL && gamma->value != 1000 )
+ {
+ return blend_color_gamma( r, text >> 16, (BYTE)(alpha >> 16), gamma ) << 16 |
+ blend_color_gamma( g, text >> 8, (BYTE)(alpha >> 8), gamma ) << 8 |
+ blend_color_gamma( b, text, (BYTE) alpha, gamma );
+ }
return blend_color( r, text >> 16, (BYTE)(alpha >> 16) ) << 16 |
blend_color( g, text >> 8, (BYTE)(alpha >> 8) ) << 8 |
blend_color( b, text, (BYTE) alpha );
}
static void draw_subpixel_glyph_8888( const dib_info *dib, const RECT *rect, const dib_info *glyph,
- const POINT *origin, DWORD text_pixel )
+ const POINT *origin, DWORD text_pixel,
+ const struct font_gamma_table *gamma )
{
DWORD *dst_ptr = get_pixel_ptr_32( dib, rect->left, rect->top );
const DWORD *glyph_ptr = get_pixel_ptr_32( glyph, origin->x, origin->y );
@@ -6292,7 +6311,8 @@ static void draw_subpixel_glyph_8888( const dib_info *dib, const RECT *rect, con
for (x = 0; x < rect->right - rect->left; x++)
{
if (glyph_ptr[x] == 0) continue;
- dst_ptr[x] = blend_subpixel( dst_ptr[x] >> 16, dst_ptr[x] >> 8, dst_ptr[x], text_pixel, glyph_ptr[x] );
+ dst_ptr[x] = blend_subpixel( dst_ptr[x] >> 16, dst_ptr[x] >> 8, dst_ptr[x],
+ text_pixel, glyph_ptr[x], gamma );
}
dst_ptr += dib->stride / 4;
glyph_ptr += glyph->stride / 4;
@@ -6300,7 +6320,8 @@ static void draw_subpixel_glyph_8888( const dib_info *dib, const RECT *rect, con
}
static void draw_subpixel_glyph_32( const dib_info *dib, const RECT *rect, const dib_info *glyph,
- const POINT *origin, DWORD text_pixel )
+ const POINT *origin, DWORD text_pixel,
+ const struct font_gamma_table *gamma )
{
DWORD *dst_ptr = get_pixel_ptr_32( dib, rect->left, rect->top );
const DWORD *glyph_ptr = get_pixel_ptr_32( glyph, origin->x, origin->y );
@@ -6319,7 +6340,7 @@ static void draw_subpixel_glyph_32( const dib_info *dib, const RECT *rect, const
val = blend_subpixel( get_field(dst_ptr[x], dib->red_shift, dib->red_len),
get_field(dst_ptr[x], dib->green_shift, dib->green_len),
get_field(dst_ptr[x], dib->blue_shift, dib->blue_len),
- text, glyph_ptr[x] );
+ text, glyph_ptr[x], gamma );
dst_ptr[x] = rgb_to_pixel_masks( dib, val >> 16, val >> 8, val );
}
dst_ptr += dib->stride / 4;
@@ -6328,7 +6349,8 @@ static void draw_subpixel_glyph_32( const dib_info *dib, const RECT *rect, const
}
static void draw_subpixel_glyph_24( const dib_info *dib, const RECT *rect, const dib_info *glyph,
- const POINT *origin, DWORD text_pixel )
+ const POINT *origin, DWORD text_pixel,
+ const struct font_gamma_table *gamma )
{
BYTE *dst_ptr = get_pixel_ptr_24( dib, rect->left, rect->top );
const DWORD *glyph_ptr = get_pixel_ptr_32( glyph, origin->x, origin->y );
@@ -6341,7 +6363,7 @@ static void draw_subpixel_glyph_24( const dib_info *dib, const RECT *rect, const
{
if (glyph_ptr[x] == 0) continue;
val = blend_subpixel( dst_ptr[x * 3 + 2], dst_ptr[x * 3 + 1], dst_ptr[x * 3],
- text_pixel, glyph_ptr[x] );
+ text_pixel, glyph_ptr[x], gamma );
dst_ptr[x * 3] = val;
dst_ptr[x * 3 + 1] = val >> 8;
dst_ptr[x * 3 + 2] = val >> 16;
@@ -6352,7 +6374,8 @@ static void draw_subpixel_glyph_24( const dib_info *dib, const RECT *rect, const
}
static void draw_subpixel_glyph_555( const dib_info *dib, const RECT *rect, const dib_info *glyph,
- const POINT *origin, DWORD text_pixel )
+ const POINT *origin, DWORD text_pixel,
+ const struct font_gamma_table *gamma )
{
WORD *dst_ptr = get_pixel_ptr_16( dib, rect->left, rect->top );
const DWORD *glyph_ptr = get_pixel_ptr_32( glyph, origin->x, origin->y );
@@ -6371,7 +6394,7 @@ static void draw_subpixel_glyph_555( const dib_info *dib, const RECT *rect, cons
val = blend_subpixel( ((dst_ptr[x] >> 7) & 0xf8) | ((dst_ptr[x] >> 12) & 0x07),
((dst_ptr[x] >> 2) & 0xf8) | ((dst_ptr[x] >> 7) & 0x07),
((dst_ptr[x] << 3) & 0xf8) | ((dst_ptr[x] >> 2) & 0x07),
- text, glyph_ptr[x] );
+ text, glyph_ptr[x], NULL );
dst_ptr[x] = ((val >> 9) & 0x7c00) | ((val >> 6) & 0x03e0) | ((val >> 3) & 0x001f);
}
dst_ptr += dib->stride / 2;
@@ -6380,7 +6403,8 @@ static void draw_subpixel_glyph_555( const dib_info *dib, const RECT *rect, cons
}
static void draw_subpixel_glyph_16( const dib_info *dib, const RECT *rect, const dib_info *glyph,
- const POINT *origin, DWORD text_pixel )
+ const POINT *origin, DWORD text_pixel,
+ const struct font_gamma_table *gamma )
{
WORD *dst_ptr = get_pixel_ptr_16( dib, rect->left, rect->top );
const DWORD *glyph_ptr = get_pixel_ptr_32( glyph, origin->x, origin->y );
@@ -6399,7 +6423,7 @@ static void draw_subpixel_glyph_16( const dib_info *dib, const RECT *rect, const
val = blend_subpixel( get_field(dst_ptr[x], dib->red_shift, dib->red_len),
get_field(dst_ptr[x], dib->green_shift, dib->green_len),
get_field(dst_ptr[x], dib->blue_shift, dib->blue_len),
- text, glyph_ptr[x] );
+ text, glyph_ptr[x], NULL );
dst_ptr[x] = rgb_to_pixel_masks( dib, val >> 16, val >> 8, val );
}
dst_ptr += dib->stride / 2;
@@ -6408,7 +6432,8 @@ static void draw_subpixel_glyph_16( const dib_info *dib, const RECT *rect, const
}
static void draw_subpixel_glyph_null( const dib_info *dib, const RECT *rect, const dib_info *glyph,
- const POINT *origin, DWORD text_pixel )
+ const POINT *origin, DWORD text_pixel,
+ const struct font_gamma_table *gamma )
{
return;
}
diff --git a/dlls/gdi32/font.c b/dlls/gdi32/font.c
index 5c67d5b518..b943800e1e 100644
--- a/dlls/gdi32/font.c
+++ b/dlls/gdi32/font.c
@@ -729,6 +729,41 @@ static void update_font_code_page( DC *dc, HANDLE font )
TRACE("charset %d => cp %d\n", charset, dc->font_code_page);
}
+static struct font_gamma_table *get_font_gamma_table()
+{
+ static const WCHAR desktopW[] = { 'C','o','n','t','r','o','l',' ','P','a','n','e','l','\\',
+ 'D','e','s','k','t','o','p',0 };
+ static const WCHAR smoothing_gamma[] = {'F','o','n','t','S','m','o','o','t','h','i','n','g',
+ 'G','a','m','m','a',0};
+ struct font_gamma_table *font_gamma;
+ const DWORD gamma_default = 1000; /* FIXME 1400 */
+ DWORD i, gamma;
+ HKEY key;
+
+ font_gamma = HeapAlloc( GetProcessHeap(), 0, sizeof(struct font_gamma_table) );
+ if ( font_gamma == NULL ) return NULL;
+
+ gamma = gamma_default;
+ if (RegOpenKeyW( HKEY_CURRENT_USER, desktopW, &key ) == ERROR_SUCCESS )
+ {
+ if ( get_key_value( key, smoothing_gamma, &gamma ) || gamma == 0 )
+ gamma = gamma_default;
+ RegCloseKey( key );
+
+ gamma = min( max( gamma, 1000), 2200 );
+ }
+
+ for ( i = 0; i < 256; i++ )
+ {
+ font_gamma->encode[i] = pow( i / 255., 1000. / gamma ) * 255. + .5;
+ font_gamma->decode[i] = pow( i / 255., gamma / 1000. ) * 255. + .5;
+ }
+
+ font_gamma->value = gamma;
+
+ TRACE("font_gamma value %d\n", font_gamma->value);
+}
+
/***********************************************************************
* FONT_SelectObject
*/
@@ -754,6 +789,8 @@ static HGDIOBJ FONT_SelectObject( HGDIOBJ handle, HDC hdc )
dc->hFont = handle;
dc->aa_flags = aa_flags ? aa_flags : GGO_BITMAP;
update_font_code_page( dc, handle );
+ if ( dc->font_gamma == NULL )
+ dc->font_gamma = get_font_gamma_table();
GDI_dec_ref_count( ret );
}
else GDI_dec_ref_count( handle );
diff --git a/dlls/gdi32/gdi_private.h b/dlls/gdi32/gdi_private.h
index 5b09b84846..e5ff467b20 100644
--- a/dlls/gdi32/gdi_private.h
+++ b/dlls/gdi32/gdi_private.h
@@ -48,6 +48,13 @@ typedef struct {
/* extra stock object: default 1x1 bitmap for memory DCs */
#define DEFAULT_BITMAP (STOCK_LAST+1)
+struct font_gamma_table
+{
+ DWORD value;
+ BYTE encode[256];
+ BYTE decode[256];
+};
+
struct gdi_obj_funcs
{
HGDIOBJ (*pSelectObject)( HGDIOBJ handle, HDC hdc );
@@ -99,6 +106,8 @@ typedef struct tagDC
struct gdi_path *path;
+ struct font_gamma_table *font_gamma;
+
UINT font_code_page;
WORD ROPmode;
WORD polyFillMode;
--
2.19.1
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