[bsdf] Added function to copy source bitmap to the distance map.
* src/sdf/ftbsdf.c (bsdf_init_distance_map): The function copies the source bitmap to the intermediate distance map which is present within the `worker'.
This commit is contained in:
Anuj Verma
parent
e883c6dc50
commit
461d693c29
190
src/sdf/ftbsdf.c
190
src/sdf/ftbsdf.c
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@ -480,4 +480,194 @@
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return error;
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}
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/**************************************************************************
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*
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* @Function:
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* bsdf_init_distance_map
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*
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* @Description:
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* This function initialize the distance map according to
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* algorithm `8-point sequential Euclidean distance mapping' (8SED).
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* Basically it copy the `source' bitmap alpha values to the
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* `distance_map->alpha' parameter of the `worker'.
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*
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* @Input:
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* source ::
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* Source bitmap to copy the data from.
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*
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* @Return:
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* worker ::
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* Target distance map to copy the data to.
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*
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* FT_Error ::
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* FreeType error, 0 means success.
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*
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*/
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static FT_Error
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bsdf_init_distance_map( const FT_Bitmap* source,
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BSDF_Worker* worker )
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{
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FT_Error error = FT_Err_Ok;
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FT_Int x_diff, y_diff;
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FT_Int t_i, t_j, s_i, s_j;
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FT_Byte* s;
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ED* t;
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/* again check the parameters (probably unnecessary) */
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if ( !source || !worker )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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/* Because of the way we convert bitmap to SDF */
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/* i.e. aligning the source to the center of the */
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/* target, the target's width/rows must be checked */
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/* before copying. */
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if ( worker->width < source->width ||
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worker->rows < source->rows )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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/* check pixel mode */
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if ( source->pixel_mode == FT_PIXEL_MODE_NONE )
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{
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FT_ERROR(( "[bsdf] bsdf_copy_source_to_target: "
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"Invalid pixel mode of source bitmap" ));
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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if ( source->pixel_mode == FT_PIXEL_MODE_MONO )
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{
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FT_TRACE0(( "[bsdf] bsdf_copy_source_to_target:\n"
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"The `bsdf' renderer can convert monochrome bitmap\n"
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"to SDF, but the results are not perfect because there\n"
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"is no way to approximate actual outline from monochrome\n"
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"bitmap. Consider using anti-aliased bitmap instead.\n" ));
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}
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#endif
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/* Calculate the difference in width and rows */
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/* of the target and source. */
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x_diff = worker->width - source->width;
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y_diff = worker->rows - source->rows;
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x_diff /= 2;
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y_diff /= 2;
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t = (ED*)worker->distance_map;
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s = source->buffer;
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/* For now we only support pixel mode `FT_PIXEL_MODE_MONO' */
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/* and `FT_PIXEL_MODE_GRAY'. More will be added later. */
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/* [NOTE]: We can also use `FT_Bitmap_Convert' to convert */
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/* bitmap to 8bpp. To avoid extra allocation and */
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/* since the target bitmap can be 16bpp we manually */
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/* convert the source bitmap to desired bpp. */
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switch ( source->pixel_mode ) {
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case FT_PIXEL_MODE_MONO:
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{
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FT_Int t_width = worker->width;
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FT_Int t_rows = worker->rows;
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FT_Int s_width = source->width;
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FT_Int s_rows = source->rows;
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for ( t_j = 0; t_j < t_rows; t_j++ )
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{
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for ( t_i = 0; t_i < t_width; t_i++ )
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{
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FT_Int t_index = t_j * t_width + t_i;
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FT_Int s_index;
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FT_Int div, mod;
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FT_Byte pixel, byte;
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t[t_index] = zero_ed;
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s_i = t_i - x_diff;
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s_j = t_j - y_diff;
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/* Assign 0 to padding similar to */
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/* the source bitmap. */
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if ( s_i < 0 || s_i >= s_width ||
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s_j < 0 || s_j >= s_rows )
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continue;
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if ( worker->params.flip_y )
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s_index = ( s_rows - s_j - 1 ) * source->pitch;
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else
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s_index = s_j * source->pitch;
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div = s_index + s_i / 8;
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mod = 7 - s_i % 8;
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pixel = s[div];
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byte = 1 << mod;
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t[t_index].alpha = pixel & byte ? 255 : 0;
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pixel = 0;
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}
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}
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break;
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}
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case FT_PIXEL_MODE_GRAY:
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{
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FT_Int t_width = worker->width;
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FT_Int t_rows = worker->rows;
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FT_Int s_width = source->width;
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FT_Int s_rows = source->rows;
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/* loop through all the pixels and */
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/* assign pixel values from source */
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for ( t_j = 0; t_j < t_rows; t_j++ )
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{
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for ( t_i = 0; t_i < t_width; t_i++ )
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{
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FT_Int t_index = t_j * t_width + t_i;
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FT_Int s_index;
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t[t_index] = zero_ed;
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s_i = t_i - x_diff;
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s_j = t_j - y_diff;
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/* Assign 0 to padding similar to */
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/* the source bitmap. */
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if ( s_i < 0 || s_i >= s_width ||
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s_j < 0 || s_j >= s_rows )
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continue;
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if ( worker->params.flip_y )
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s_index = ( s_rows - s_j - 1 ) * s_width + s_i;
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else
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s_index = s_j * s_width + s_i;
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/* simply copy the alpha values */
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t[t_index].alpha = s[s_index];
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}
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}
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break;
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}
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default:
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FT_ERROR(( "[bsdf] bsdf_copy_source_to_target: "
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"unsopported pixel mode of source bitmap\n" ));
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error = FT_THROW( Unimplemented_Feature );
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break;
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}
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Exit:
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return error;
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}
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/* END */
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