forked from minhngoc25a/freetype2
[smooth] Separate LCD paths from gray rendering.
This makes `ft_smooth_render' a lot smaller and easier to follow. It also cleanly separates Harmony and ClearType-style LCD rendering algorithms. Now I only wish to move LCD filtering and geometry from FT_Library to FT_Renderer. * src/smooth/ftsmooth.c (ft_smooth_render): Move LCD code from here... (ft_smooth_raster_lcd, ft_smooth_raster_lcdv): ... to here. [FT_CONFIG_OPTION_SUBPIXEL_RENDERING]: Reorganize #ifdef's.
This commit is contained in:
Alexei Podtelezhnikov
parent
a443474755
commit
2d67511a14
13
ChangeLog
13
ChangeLog
|
|
@ -1,3 +1,16 @@
|
|||
2020-07-03 Alexei Podtelezhnikov <apodtele@gmail.com>
|
||||
|
||||
[smooth] Separate LCD paths from gray rendering.
|
||||
|
||||
This makes `ft_smooth_render' a lot smaller and easier to follow. It
|
||||
also cleanly separates Harmony and ClearType-style LCD rendering
|
||||
algorithms. Now I only wish to move LCD filtering and geometry from
|
||||
FT_Library to FT_Renderer.
|
||||
|
||||
* src/smooth/ftsmooth.c (ft_smooth_render): Move LCD code from here...
|
||||
(ft_smooth_raster_lcd, ft_smooth_raster_lcdv): ... to here.
|
||||
[FT_CONFIG_OPTION_SUBPIXEL_RENDERING]: Reorganize #ifdef's.
|
||||
|
||||
2020-06-20 Sebastian Rasmussen <sebras@gmail.com>
|
||||
|
||||
[cff] Fix handling of `style_name == NULL' (#58630).
|
||||
|
|
|
|||
|
|
@ -25,36 +25,6 @@
|
|||
#include "ftsmerrs.h"
|
||||
|
||||
|
||||
/* initialize renderer -- init its raster */
|
||||
static FT_Error
|
||||
ft_smooth_init( FT_Renderer render )
|
||||
{
|
||||
|
||||
#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
|
||||
|
||||
FT_Vector* sub = render->root.library->lcd_geometry;
|
||||
|
||||
|
||||
/* set up default subpixel geometry for striped RGB panels. */
|
||||
sub[0].x = -21;
|
||||
sub[0].y = 0;
|
||||
sub[1].x = 0;
|
||||
sub[1].y = 0;
|
||||
sub[2].x = 21;
|
||||
sub[2].y = 0;
|
||||
|
||||
#else /* set up default LCD filtering */
|
||||
|
||||
FT_Library_SetLcdFilter( render->root.library, FT_LCD_FILTER_DEFAULT );
|
||||
|
||||
#endif
|
||||
|
||||
render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* sets render-specific mode */
|
||||
static FT_Error
|
||||
ft_smooth_set_mode( FT_Renderer render,
|
||||
|
|
@ -106,6 +76,255 @@
|
|||
FT_Outline_Get_CBox( &slot->outline, cbox );
|
||||
}
|
||||
|
||||
#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
|
||||
|
||||
/* initialize renderer -- init its raster */
|
||||
static FT_Error
|
||||
ft_smooth_init( FT_Renderer render )
|
||||
{
|
||||
FT_Vector* sub = render->root.library->lcd_geometry;
|
||||
|
||||
|
||||
/* set up default subpixel geometry for striped RGB panels. */
|
||||
sub[0].x = -21;
|
||||
sub[0].y = 0;
|
||||
sub[1].x = 0;
|
||||
sub[1].y = 0;
|
||||
sub[2].x = 21;
|
||||
sub[2].y = 0;
|
||||
|
||||
render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static FT_Error
|
||||
ft_smooth_raster_lcd( FT_Renderer render,
|
||||
FT_Outline* outline,
|
||||
FT_Bitmap* bitmap )
|
||||
{
|
||||
FT_Error error = FT_Err_Ok;
|
||||
unsigned int width = bitmap->width / 3;
|
||||
FT_Vector* sub = render->root.library->lcd_geometry;
|
||||
FT_Pos x, y;
|
||||
|
||||
FT_Raster_Params params;
|
||||
|
||||
|
||||
params.target = bitmap;
|
||||
params.source = outline;
|
||||
params.flags = FT_RASTER_FLAG_AA;
|
||||
|
||||
/* Render 3 separate coverage bitmaps, shifting the outline. */
|
||||
FT_Outline_Translate( outline,
|
||||
-sub[0].x,
|
||||
-sub[0].y );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
x = sub[0].x;
|
||||
y = sub[0].y;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
bitmap->buffer += width;
|
||||
FT_Outline_Translate( outline,
|
||||
sub[0].x - sub[1].x,
|
||||
sub[0].y - sub[1].y );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
x = sub[1].x;
|
||||
y = sub[1].y;
|
||||
bitmap->buffer -= width;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
bitmap->buffer += 2 * width;
|
||||
FT_Outline_Translate( outline,
|
||||
sub[1].x - sub[2].x,
|
||||
sub[1].y - sub[2].y );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
x = sub[2].x;
|
||||
y = sub[2].y;
|
||||
bitmap->buffer -= 2 * width;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
/* XXX: Rearrange the bytes according to FT_PIXEL_MODE_LCD. */
|
||||
/* XXX: It is more efficient to render every third byte above. */
|
||||
{
|
||||
FT_Memory memory = render->root.memory;
|
||||
FT_Byte* line;
|
||||
FT_Byte* temp = NULL;
|
||||
FT_UInt i, j;
|
||||
|
||||
unsigned int height = bitmap->rows;
|
||||
int pitch = bitmap->pitch;
|
||||
|
||||
|
||||
if ( FT_ALLOC( temp, (FT_ULong)pitch ) )
|
||||
goto Exit;
|
||||
|
||||
for ( i = 0; i < height; i++ )
|
||||
{
|
||||
line = bitmap->buffer + i * (FT_ULong)pitch;
|
||||
for ( j = 0; j < width; j++ )
|
||||
{
|
||||
temp[3 * j ] = line[j];
|
||||
temp[3 * j + 1] = line[j + width];
|
||||
temp[3 * j + 2] = line[j + width + width];
|
||||
}
|
||||
FT_MEM_COPY( line, temp, pitch );
|
||||
}
|
||||
|
||||
FT_FREE( temp );
|
||||
}
|
||||
|
||||
Exit:
|
||||
FT_Outline_Translate( outline, x, y );
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
static FT_Error
|
||||
ft_smooth_raster_lcdv( FT_Renderer render,
|
||||
FT_Outline* outline,
|
||||
FT_Bitmap* bitmap )
|
||||
{
|
||||
FT_Error error = FT_Err_Ok;
|
||||
int pitch = bitmap->pitch;
|
||||
FT_Vector* sub = render->root.library->lcd_geometry;
|
||||
FT_Pos x, y;
|
||||
|
||||
FT_Raster_Params params;
|
||||
|
||||
|
||||
params.target = bitmap;
|
||||
params.source = outline;
|
||||
params.flags = FT_RASTER_FLAG_AA;
|
||||
|
||||
/* Render 3 separate coverage bitmaps, shifting the outline. */
|
||||
/* Notice that the subpixel geometry vectors are rotated. */
|
||||
/* Triple the pitch to render on each third row. */
|
||||
bitmap->pitch *= 3;
|
||||
bitmap->rows /= 3;
|
||||
|
||||
FT_Outline_Translate( outline,
|
||||
-sub[0].y,
|
||||
sub[0].x );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
x = sub[0].y;
|
||||
y = -sub[0].x;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
bitmap->buffer += pitch;
|
||||
FT_Outline_Translate( outline,
|
||||
sub[0].y - sub[1].y,
|
||||
sub[1].x - sub[0].x );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
x = sub[1].y;
|
||||
y = -sub[1].x;
|
||||
bitmap->buffer -= pitch;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
bitmap->buffer += 2 * pitch;
|
||||
FT_Outline_Translate( outline,
|
||||
sub[1].y - sub[2].y,
|
||||
sub[2].x - sub[1].x );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
x = sub[2].y;
|
||||
y = -sub[2].x;
|
||||
bitmap->buffer -= 2 * pitch;
|
||||
|
||||
Exit:
|
||||
FT_Outline_Translate( outline, x, y );
|
||||
|
||||
bitmap->pitch /= 3;
|
||||
bitmap->rows *= 3;
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
#else /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
|
||||
|
||||
/* initialize renderer -- init its raster */
|
||||
static FT_Error
|
||||
ft_smooth_init( FT_Renderer render )
|
||||
{
|
||||
/* set up default LCD filtering */
|
||||
FT_Library_SetLcdFilter( render->root.library, FT_LCD_FILTER_DEFAULT );
|
||||
|
||||
render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static FT_Error
|
||||
ft_smooth_raster_lcd( FT_Renderer render,
|
||||
FT_Outline* outline,
|
||||
FT_Bitmap* bitmap )
|
||||
{
|
||||
FT_Error error = FT_Err_Ok;
|
||||
FT_Vector* points = outline->points;
|
||||
FT_Vector* points_end = FT_OFFSET( points, outline->n_points );
|
||||
FT_Vector* vec;
|
||||
|
||||
FT_Raster_Params params;
|
||||
|
||||
|
||||
params.target = bitmap;
|
||||
params.source = outline;
|
||||
params.flags = FT_RASTER_FLAG_AA;
|
||||
|
||||
/* implode outline */
|
||||
for ( vec = points; vec < points_end; vec++ )
|
||||
vec->x *= 3;
|
||||
|
||||
/* render outline into the bitmap */
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
|
||||
/* deflate outline */
|
||||
for ( vec = points; vec < points_end; vec++ )
|
||||
vec->x /= 3;
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
static FT_Error
|
||||
ft_smooth_raster_lcdv( FT_Renderer render,
|
||||
FT_Outline* outline,
|
||||
FT_Bitmap* bitmap )
|
||||
{
|
||||
FT_Error error = FT_Err_Ok;
|
||||
FT_Vector* points = outline->points;
|
||||
FT_Vector* points_end = FT_OFFSET( points, outline->n_points );
|
||||
FT_Vector* vec;
|
||||
|
||||
FT_Raster_Params params;
|
||||
|
||||
|
||||
params.target = bitmap;
|
||||
params.source = outline;
|
||||
params.flags = FT_RASTER_FLAG_AA;
|
||||
|
||||
/* implode outline */
|
||||
for ( vec = points; vec < points_end; vec++ )
|
||||
vec->y *= 3;
|
||||
|
||||
/* render outline into the bitmap */
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
|
||||
/* deflate outline */
|
||||
for ( vec = points; vec < points_end; vec++ )
|
||||
vec->y /= 3;
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
#endif /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
|
||||
|
||||
/* convert a slot's glyph image into a bitmap */
|
||||
static FT_Error
|
||||
|
|
@ -120,10 +339,6 @@
|
|||
FT_Memory memory = render->root.memory;
|
||||
FT_Pos x_shift = 0;
|
||||
FT_Pos y_shift = 0;
|
||||
FT_Int hmul = ( mode == FT_RENDER_MODE_LCD );
|
||||
FT_Int vmul = ( mode == FT_RENDER_MODE_LCD_V );
|
||||
|
||||
FT_Raster_Params params;
|
||||
|
||||
|
||||
/* check glyph image format */
|
||||
|
|
@ -136,7 +351,8 @@
|
|||
/* check mode */
|
||||
if ( mode != FT_RENDER_MODE_NORMAL &&
|
||||
mode != FT_RENDER_MODE_LIGHT &&
|
||||
!hmul && !vmul )
|
||||
mode != FT_RENDER_MODE_LCD &&
|
||||
mode != FT_RENDER_MODE_LCD_V )
|
||||
{
|
||||
error = FT_THROW( Cannot_Render_Glyph );
|
||||
goto Exit;
|
||||
|
|
@ -181,188 +397,52 @@
|
|||
if ( x_shift || y_shift )
|
||||
FT_Outline_Translate( outline, x_shift, y_shift );
|
||||
|
||||
/* set up parameters */
|
||||
params.target = bitmap;
|
||||
params.source = outline;
|
||||
params.flags = FT_RASTER_FLAG_AA;
|
||||
if ( mode == FT_RENDER_MODE_NORMAL ||
|
||||
mode == FT_RENDER_MODE_LIGHT )
|
||||
{
|
||||
FT_Raster_Params params;
|
||||
|
||||
|
||||
params.target = bitmap;
|
||||
params.source = outline;
|
||||
params.flags = FT_RASTER_FLAG_AA;
|
||||
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
}
|
||||
else
|
||||
{
|
||||
if ( mode == FT_RENDER_MODE_LCD )
|
||||
error = ft_smooth_raster_lcd ( render, outline, bitmap );
|
||||
else if ( mode == FT_RENDER_MODE_LCD_V )
|
||||
error = ft_smooth_raster_lcdv( render, outline, bitmap );
|
||||
|
||||
#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
|
||||
|
||||
/* implode outline if needed */
|
||||
{
|
||||
FT_Vector* points = outline->points;
|
||||
FT_Vector* points_end = FT_OFFSET( points, outline->n_points );
|
||||
FT_Vector* vec;
|
||||
|
||||
|
||||
if ( hmul )
|
||||
for ( vec = points; vec < points_end; vec++ )
|
||||
vec->x *= 3;
|
||||
|
||||
if ( vmul )
|
||||
for ( vec = points; vec < points_end; vec++ )
|
||||
vec->y *= 3;
|
||||
}
|
||||
|
||||
/* render outline into the bitmap */
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
|
||||
/* deflate outline if needed */
|
||||
{
|
||||
FT_Vector* points = outline->points;
|
||||
FT_Vector* points_end = FT_OFFSET( points, outline->n_points );
|
||||
FT_Vector* vec;
|
||||
|
||||
|
||||
if ( hmul )
|
||||
for ( vec = points; vec < points_end; vec++ )
|
||||
vec->x /= 3;
|
||||
|
||||
if ( vmul )
|
||||
for ( vec = points; vec < points_end; vec++ )
|
||||
vec->y /= 3;
|
||||
}
|
||||
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
/* finally apply filtering */
|
||||
if ( hmul || vmul )
|
||||
{
|
||||
FT_Byte* lcd_weights;
|
||||
FT_Bitmap_LcdFilterFunc lcd_filter_func;
|
||||
|
||||
|
||||
/* Per-face LCD filtering takes priority if set up. */
|
||||
if ( slot->face && slot->face->internal->lcd_filter_func )
|
||||
/* finally apply filtering */
|
||||
{
|
||||
lcd_weights = slot->face->internal->lcd_weights;
|
||||
lcd_filter_func = slot->face->internal->lcd_filter_func;
|
||||
}
|
||||
else
|
||||
{
|
||||
lcd_weights = slot->library->lcd_weights;
|
||||
lcd_filter_func = slot->library->lcd_filter_func;
|
||||
}
|
||||
|
||||
if ( lcd_filter_func )
|
||||
lcd_filter_func( bitmap, lcd_weights );
|
||||
}
|
||||
|
||||
#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
|
||||
|
||||
if ( hmul ) /* lcd */
|
||||
{
|
||||
FT_Byte* line;
|
||||
FT_Byte* temp = NULL;
|
||||
FT_UInt i, j;
|
||||
|
||||
unsigned int height = bitmap->rows;
|
||||
unsigned int width = bitmap->width;
|
||||
int pitch = bitmap->pitch;
|
||||
|
||||
FT_Vector* sub = slot->library->lcd_geometry;
|
||||
FT_Byte* lcd_weights;
|
||||
FT_Bitmap_LcdFilterFunc lcd_filter_func;
|
||||
|
||||
|
||||
/* Render 3 separate monochrome bitmaps, shifting the outline. */
|
||||
width /= 3;
|
||||
|
||||
FT_Outline_Translate( outline,
|
||||
-sub[0].x,
|
||||
-sub[0].y );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
bitmap->buffer += width;
|
||||
FT_Outline_Translate( outline,
|
||||
sub[0].x - sub[1].x,
|
||||
sub[0].y - sub[1].y );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
bitmap->buffer -= width;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
bitmap->buffer += 2 * width;
|
||||
FT_Outline_Translate( outline,
|
||||
sub[1].x - sub[2].x,
|
||||
sub[1].y - sub[2].y );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
bitmap->buffer -= 2 * width;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
x_shift -= sub[2].x;
|
||||
y_shift -= sub[2].y;
|
||||
|
||||
/* XXX: Rearrange the bytes according to FT_PIXEL_MODE_LCD. */
|
||||
/* XXX: It is more efficient to render every third byte above. */
|
||||
|
||||
if ( FT_ALLOC( temp, (FT_ULong)pitch ) )
|
||||
goto Exit;
|
||||
|
||||
for ( i = 0; i < height; i++ )
|
||||
{
|
||||
line = bitmap->buffer + i * (FT_ULong)pitch;
|
||||
for ( j = 0; j < width; j++ )
|
||||
/* Per-face LCD filtering takes priority if set up. */
|
||||
if ( slot->face && slot->face->internal->lcd_filter_func )
|
||||
{
|
||||
temp[3 * j ] = line[j];
|
||||
temp[3 * j + 1] = line[j + width];
|
||||
temp[3 * j + 2] = line[j + width + width];
|
||||
lcd_weights = slot->face->internal->lcd_weights;
|
||||
lcd_filter_func = slot->face->internal->lcd_filter_func;
|
||||
}
|
||||
FT_MEM_COPY( line, temp, pitch );
|
||||
else
|
||||
{
|
||||
lcd_weights = slot->library->lcd_weights;
|
||||
lcd_filter_func = slot->library->lcd_filter_func;
|
||||
}
|
||||
|
||||
if ( lcd_filter_func )
|
||||
lcd_filter_func( bitmap, lcd_weights );
|
||||
}
|
||||
|
||||
FT_FREE( temp );
|
||||
#endif /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
|
||||
|
||||
}
|
||||
else if ( vmul ) /* lcd_v */
|
||||
{
|
||||
int pitch = bitmap->pitch;
|
||||
|
||||
FT_Vector* sub = slot->library->lcd_geometry;
|
||||
|
||||
|
||||
/* Render 3 separate monochrome bitmaps, shifting the outline. */
|
||||
/* Notice that the subpixel geometry vectors are rotated. */
|
||||
/* Triple the pitch to render on each third row. */
|
||||
bitmap->pitch *= 3;
|
||||
bitmap->rows /= 3;
|
||||
|
||||
FT_Outline_Translate( outline,
|
||||
-sub[0].y,
|
||||
sub[0].x );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
bitmap->buffer += pitch;
|
||||
FT_Outline_Translate( outline,
|
||||
sub[0].y - sub[1].y,
|
||||
sub[1].x - sub[0].x );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
bitmap->buffer -= pitch;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
bitmap->buffer += 2 * pitch;
|
||||
FT_Outline_Translate( outline,
|
||||
sub[1].y - sub[2].y,
|
||||
sub[2].x - sub[1].x );
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
bitmap->buffer -= 2 * pitch;
|
||||
if ( error )
|
||||
goto Exit;
|
||||
|
||||
x_shift -= sub[2].y;
|
||||
y_shift += sub[2].x;
|
||||
|
||||
bitmap->pitch /= 3;
|
||||
bitmap->rows *= 3;
|
||||
}
|
||||
else /* grayscale */
|
||||
error = render->raster_render( render->raster, ¶ms );
|
||||
|
||||
#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
|
||||
|
||||
Exit:
|
||||
if ( !error )
|
||||
|
|
|
|||
Loading…
Reference in New Issue