[PATCH v4] gdi32: Support the gamma correction for the subpixel rendering.
By setting the appropriate gamma value, the subpixel rendering color fringing reduced. Signed-off-by: Byeongsik Jeon <bsjeon(a)hanmail.net> --- https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#FT... v2: Fix the void *, thread safety. v3: Fix the wrong patch send. v4: Fix the memory leaks (dc->font_gamma = NULL; removed ). Use the 'struct font_intensities' instead of 'union font_intensities'. Move the 'struct font_gamma_ramp' to the dibdrv.h. Add the '1000 * gamma / 1400' line. dlls/gdi32/dc.c | 1 + dlls/gdi32/dibdrv/dibdrv.h | 15 ++++++++++- dlls/gdi32/dibdrv/graphics.c | 40 ++++++++++++++++++++++----- dlls/gdi32/dibdrv/primitives.c | 49 +++++++++++++++++++++++++--------- dlls/gdi32/font.c | 30 +++++++++++++++++++++ dlls/gdi32/gdi_private.h | 3 +++ 6 files changed, 118 insertions(+), 20 deletions(-) diff --git a/dlls/gdi32/dc.c b/dlls/gdi32/dc.c index 892d3e9744..8ee8a52d94 100644 --- a/dlls/gdi32/dc.c +++ b/dlls/gdi32/dc.c @@ -168,6 +168,7 @@ 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_ramp ); HeapFree( GetProcessHeap(), 0, dc ); } diff --git a/dlls/gdi32/dibdrv/dibdrv.h b/dlls/gdi32/dibdrv/dibdrv.h index f79f5b0867..65305e5394 100644 --- a/dlls/gdi32/dibdrv/dibdrv.h +++ b/dlls/gdi32/dibdrv/dibdrv.h @@ -85,6 +85,19 @@ struct intensity_range BYTE b_min, b_max; }; +struct font_gamma_ramp +{ + DWORD gamma; + BYTE encode[256]; + BYTE decode[256]; +}; + +struct font_intensities +{ + struct intensity_range aa_ranges[17]; + struct font_gamma_ramp *gamma_ramp; +}; + typedef struct dibdrv_physdev { struct gdi_physdev dev; @@ -192,7 +205,7 @@ 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_ramp *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..0070dae75a 100644 --- a/dlls/gdi32/dibdrv/graphics.c +++ b/dlls/gdi32/dibdrv/graphics.c @@ -520,6 +520,26 @@ static inline void get_aa_ranges( COLORREF col, struct intensity_range intensiti } } +static void update_font_gamma_ramp( DC *dc ) +{ + const DWORD gamma = dc->font_gamma; + struct font_gamma_ramp *ramp = dc->font_gamma_ramp; + int i; + + if ( ramp == NULL ) + ramp = HeapAlloc( GetProcessHeap(), 0, sizeof( struct font_gamma_ramp ) ); + if ( ramp == NULL ) return; + + for ( i = 0; i < 256; i++ ) + { + ramp->encode[i] = pow( i / 255., 1000. / gamma ) * 255. + .5; + ramp->decode[i] = pow( i / 255., gamma / 1000. ) * 255. + .5; + } + ramp->gamma = gamma; + + dc->font_gamma_ramp = ramp; +} + static DWORD font_cache_hash( struct cached_font *font ) { DWORD hash = 0, *ptr, two_chars; @@ -683,7 +703,7 @@ 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 struct font_intensities *lut, const struct clipped_rects *clipped_rects, RECT *bounds ) { int i; @@ -705,10 +725,10 @@ 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_ramp ); else dib->funcs->draw_glyph( dib, &clipped_rect, glyph_dib, &src_origin, - text_color, ranges ); + text_color, lut->aa_ranges ); } } } @@ -816,7 +836,7 @@ static void render_string( DC *dc, dib_info *dib, struct cached_font *font, INT struct cached_glyph *glyph; dib_info glyph_dib; DWORD text_color; - struct intensity_range ranges[17]; + struct font_intensities lut; glyph_dib.bit_count = get_glyph_depth( font->aa_flags ); glyph_dib.rect.left = 0; @@ -826,8 +846,14 @@ 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) - get_aa_ranges( dib->funcs->pixel_to_colorref( dib, text_color ), ranges ); + if ( glyph_dib.bit_count == 32 ) + { + if ( !dc->font_gamma_ramp || dc->font_gamma != dc->font_gamma_ramp->gamma ) + update_font_gamma_ramp( dc ); + lut.gamma_ramp = dc->font_gamma_ramp; + } + else + get_aa_ranges( dib->funcs->pixel_to_colorref( dib, text_color ), lut.aa_ranges ); for (i = 0; i < count; i++) { @@ -841,7 +867,7 @@ 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..91b60538f7 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_ramp *gamma_ramp ) +{ + if ( alpha == 0 ) return dst; + if ( alpha == 255 ) return text; + if ( dst == text ) return dst; + + return gamma_ramp->encode[ blend_color( gamma_ramp->decode[dst], + gamma_ramp->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_ramp *gamma_ramp ) { + if ( gamma_ramp != NULL && gamma_ramp->gamma != 1000 ) + { + return blend_color_gamma( r, text >> 16, (BYTE)(alpha >> 16), gamma_ramp ) << 16 | + blend_color_gamma( g, text >> 8, (BYTE)(alpha >> 8), gamma_ramp ) << 8 | + blend_color_gamma( b, text, (BYTE) alpha, gamma_ramp ); + } 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_ramp *gamma_ramp ) { 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_ramp ); } 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_ramp *gamma_ramp ) { 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_ramp ); 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_ramp *gamma_ramp ) { 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_ramp ); 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_ramp *gamma_ramp ) { 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_ramp *gamma_ramp ) { 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_ramp *gamma_ramp ) { return; } diff --git a/dlls/gdi32/font.c b/dlls/gdi32/font.c index 5c67d5b518..238eb51717 100644 --- a/dlls/gdi32/font.c +++ b/dlls/gdi32/font.c @@ -729,6 +729,34 @@ static void update_font_code_page( DC *dc, HANDLE font ) TRACE("charset %d => cp %d\n", charset, dc->font_code_page); } +static DWORD get_font_gamma_value( void ) +{ + 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}; + const DWORD gamma_default = 1400; + DWORD gamma; + HKEY key; + + 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 ); + TRACE( "font_gamma %d\n", gamma ); + } + + /* Calibration the difference between the registry value and the Wine gamma value. + This shows a similar looks to the Windows Native for the same registry value.*/ + gamma = 1000 * gamma / 1400; + + return gamma; +} + /*********************************************************************** * FONT_SelectObject */ @@ -754,6 +782,8 @@ 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 == 0 ) + dc->font_gamma = get_font_gamma_value(); 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..fe88c66a2b 100644 --- a/dlls/gdi32/gdi_private.h +++ b/dlls/gdi32/gdi_private.h @@ -99,6 +99,9 @@ typedef struct tagDC struct gdi_path *path; + DWORD font_gamma; + struct font_gamma_ramp *font_gamma_ramp; + UINT font_code_page; WORD ROPmode; WORD polyFillMode; -- 2.19.1
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Byeongsik Jeon