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[base] Clean up the bitmap flow control.

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* src/base/ftbitmap.c (FT_Bitmap_Copy): Flip the copy if its pitch
is trully opposite, zero is not a positive value.
(FT_Bitmap_Convert): Set negative pitch as needed, accept negative
alignment values.
This commit is contained in:
Alexei Podtelezhnikov 2022-09-22 20:40:21 -04:00
parent c456eeb47a
commit c9c326312f
1 changed files with 20 additions and 20 deletions
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40
src/base/ftbitmap.c
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@ -67,8 +67,7 @@
FT_Memory memory;
FT_Error error = FT_Err_Ok;
FT_Int pitch;
FT_Int source_pitch_sign, target_pitch_sign;
FT_Int flip;
if ( !library )
@ -80,15 +79,15 @@
if ( source == target )
return FT_Err_Ok;
source_pitch_sign = source->pitch < 0 ? -1 : 1;
target_pitch_sign = target->pitch < 0 ? -1 : 1;
flip = ( source->pitch < 0 && target->pitch > 0 ) ||
( source->pitch > 0 && target->pitch < 0 );
memory = library->memory;
FT_FREE( target->buffer );
*target = *source;
if ( source_pitch_sign != target_pitch_sign )
if ( flip )
target->pitch = -target->pitch;
if ( !source->buffer )
@ -102,10 +101,7 @@
if ( !error )
{
if ( source_pitch_sign == target_pitch_sign )
FT_MEM_COPY( target->buffer, source->buffer,
(FT_Long)source->rows * pitch );
else
if ( flip )
{
/* take care of bitmap flow */
FT_UInt i;
@ -123,6 +119,9 @@
t -= pitch;
}
}
else
FT_MEM_COPY( target->buffer, source->buffer,
(FT_Long)source->rows * pitch );
}
return error;
@ -519,8 +518,9 @@
case FT_PIXEL_MODE_LCD_V:
case FT_PIXEL_MODE_BGRA:
{
FT_Int pad, target_pitch;
FT_Int old_target_pitch = target->pitch;
FT_Int width = (FT_Int)source->width;
FT_Int neg = ( target->pitch == 0 && source->pitch < 0 ) ||
target->pitch < 0;
FT_Bitmap_Done( library, target );
@ -529,20 +529,20 @@
target->rows = source->rows;
target->width = source->width;
pad = 0;
if ( alignment > 0 )
if ( alignment )
{
pad = (FT_Int)source->width % alignment;
if ( pad != 0 )
pad = alignment - pad;
FT_Int rem = width % alignment;
if ( rem )
width = alignment > 0 ? width - rem + alignment
: width - rem - alignment;
}
target_pitch = (FT_Int)source->width + pad;
if ( FT_QALLOC_MULT( target->buffer, target->rows, target_pitch ) )
if ( FT_QALLOC_MULT( target->buffer, target->rows, width ) )
return error;
target->pitch = old_target_pitch < 0 ? -target_pitch : target_pitch;
target->pitch = neg ? -width : width;
}
break;