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-rw-r--r--libass/ass_font.c251
1 files changed, 0 insertions, 251 deletions
diff --git a/libass/ass_font.c b/libass/ass_font.c
index 5889b49..95ae335 100644
--- a/libass/ass_font.c
+++ b/libass/ass_font.c
@@ -436,77 +436,6 @@ static int ass_strike_outline_glyph(FT_Face face, ASS_Font *font,
return 0;
}
-
-int outline_alloc(ASS_Outline *outline, size_t n_points, size_t n_contours)
-{
- outline->contours = malloc(sizeof(size_t) * n_contours);
- outline->points = malloc(sizeof(FT_Vector) * n_points);
- outline->tags = malloc(n_points);
- if (!outline->contours || !outline->points || !outline->tags)
- return 0;
-
- outline->max_contours = n_contours;
- outline->max_points = n_points;
- return 1;
-}
-
-ASS_Outline *outline_convert(const FT_Outline *source)
-{
- if (!source)
- return NULL;
-
- ASS_Outline *ol = calloc(1, sizeof(*ol));
- if (!ol)
- return NULL;
-
- if (!outline_alloc(ol, source->n_points, source->n_contours)) {
- outline_free(ol);
- free(ol);
- return NULL;
- }
-
- for (int i = 0; i < source->n_contours; ++i)
- ol->contours[i] = source->contours[i];
- memcpy(ol->points, source->points, sizeof(FT_Vector) * source->n_points);
- memcpy(ol->tags, source->tags, source->n_points);
- ol->n_contours = source->n_contours;
- ol->n_points = source->n_points;
- return ol;
-}
-
-ASS_Outline *outline_copy(const ASS_Outline *source)
-{
- if (!source)
- return NULL;
-
- ASS_Outline *ol = calloc(1, sizeof(*ol));
- if (!ol)
- return NULL;
-
- if (!outline_alloc(ol, source->n_points, source->n_contours)) {
- outline_free(ol);
- free(ol);
- return NULL;
- }
-
- memcpy(ol->contours, source->contours, sizeof(size_t) * source->n_contours);
- memcpy(ol->points, source->points, sizeof(FT_Vector) * source->n_points);
- memcpy(ol->tags, source->tags, source->n_points);
- ol->n_contours = source->n_contours;
- ol->n_points = source->n_points;
- return ol;
-}
-
-void outline_free(ASS_Outline *outline)
-{
- if (!outline)
- return;
-
- free(outline->contours);
- free(outline->points);
- free(outline->tags);
-}
-
/**
* Slightly embold a glyph without touching its metrics
*/
@@ -693,183 +622,3 @@ void ass_font_clear(ASS_Font *font)
}
free(font->desc.family);
}
-
-/**
- * \brief Calculate the cbox of a series of points
- */
-static void
-get_contour_cbox(FT_BBox *box, FT_Vector *points, int start, int end)
-{
- box->xMin = box->yMin = INT_MAX;
- box->xMax = box->yMax = INT_MIN;
- int i;
-
- for (i = start; i <= end; i++) {
- box->xMin = (points[i].x < box->xMin) ? points[i].x : box->xMin;
- box->xMax = (points[i].x > box->xMax) ? points[i].x : box->xMax;
- box->yMin = (points[i].y < box->yMin) ? points[i].y : box->yMin;
- box->yMax = (points[i].y > box->yMax) ? points[i].y : box->yMax;
- }
-}
-
-/**
- * \brief Determine signed area of a contour
- * \return area doubled
- */
-static long long get_contour_area(FT_Vector *points, int start, int end)
-{
- long long area = 0;
- int x = points[end].x;
- int y = points[end].y;
- for (int i = start; i <= end; i++) {
- area += (long long)(points[i].x + x) * (points[i].y - y);
- x = points[i].x;
- y = points[i].y;
- }
- return area;
-}
-
-void outline_translate(const ASS_Outline *outline, FT_Pos dx, FT_Pos dy)
-{
- for (size_t i = 0; i < outline->n_points; ++i) {
- outline->points[i].x += dx;
- outline->points[i].y += dy;
- }
-}
-
-void outline_transform(const ASS_Outline *outline, const FT_Matrix *matrix)
-{
- for (size_t i = 0; i < outline->n_points; ++i) {
- FT_Pos x = FT_MulFix(outline->points[i].x, matrix->xx) +
- FT_MulFix(outline->points[i].y, matrix->xy);
- FT_Pos y = FT_MulFix(outline->points[i].x, matrix->yx) +
- FT_MulFix(outline->points[i].y, matrix->yy);
- outline->points[i].x = x;
- outline->points[i].y = y;
- }
-}
-
-void outline_get_cbox(const ASS_Outline *outline, FT_BBox *cbox)
-{
- if (!outline->n_points) {
- cbox->xMin = cbox->xMax = 0;
- cbox->yMin = cbox->yMax = 0;
- return;
- }
- cbox->xMin = cbox->xMax = outline->points[0].x;
- cbox->yMin = cbox->yMax = outline->points[0].y;
- for (size_t i = 1; i < outline->n_points; ++i) {
- cbox->xMin = FFMIN(cbox->xMin, outline->points[i].x);
- cbox->xMax = FFMAX(cbox->xMax, outline->points[i].x);
- cbox->yMin = FFMIN(cbox->yMin, outline->points[i].y);
- cbox->yMax = FFMAX(cbox->yMax, outline->points[i].y);
- }
-}
-
-/**
- * \brief Apply fixups to please the FreeType stroker and improve the
- * rendering result, especially in case the outline has some anomalies.
- * At the moment, the following fixes are done:
- *
- * 1. Reverse contours that have "inside" winding direction but are not
- * contained in any other contours' cbox.
- * 2. Remove "inside" contours depending on border size, so that large
- * borders do not reverse the winding direction, which leads to "holes"
- * inside the border. The inside will be filled by the border of the
- * outside contour anyway in this case.
- *
- * \param outline FreeType outline, modified in-place
- * \param border_x border size, x direction, d6 format
- * \param border_x border size, y direction, d6 format
- */
-void fix_freetype_stroker(ASS_Outline *outline, int border_x, int border_y)
-{
- int nc = outline->n_contours;
- int begin, stop;
- char modified = 0;
- char *valid_cont = malloc(nc);
- int start = 0;
- int end = -1;
- FT_BBox *boxes = malloc(nc * sizeof(FT_BBox));
- int i, j;
-
- long long area = 0;
- // create a list of cboxes of the contours
- for (i = 0; i < nc; i++) {
- start = end + 1;
- end = outline->contours[i];
- get_contour_cbox(&boxes[i], outline->points, start, end);
- area += get_contour_area(outline->points, start, end);
- }
- int inside_direction = area < 0;
-
- // for each contour, check direction and whether it's "outside"
- // or contained in another contour
- end = -1;
- for (i = 0; i < nc; i++) {
- start = end + 1;
- end = outline->contours[i];
- int dir = get_contour_area(outline->points, start, end) > 0;
- valid_cont[i] = 1;
- if (dir == inside_direction) {
- for (j = 0; j < nc; j++) {
- if (i == j)
- continue;
- if (boxes[i].xMin >= boxes[j].xMin &&
- boxes[i].xMax <= boxes[j].xMax &&
- boxes[i].yMin >= boxes[j].yMin &&
- boxes[i].yMax <= boxes[j].yMax)
- goto check_inside;
- }
- /* "inside" contour but we can't find anything it could be
- * inside of - assume the font is buggy and it should be
- * an "outside" contour, and reverse it */
- for (j = 0; j < (end - start) / 2; j++) {
- FT_Vector temp = outline->points[start + 1 + j];
- char temp2 = outline->tags[start + 1 + j];
- outline->points[start + 1 + j] = outline->points[end - j];
- outline->points[end - j] = temp;
- outline->tags[start + 1 + j] = outline->tags[end - j];
- outline->tags[end - j] = temp2;
- }
- dir ^= 1;
- }
- check_inside:
- if (dir == inside_direction) {
- FT_BBox box;
- get_contour_cbox(&box, outline->points, start, end);
- int width = box.xMax - box.xMin;
- int height = box.yMax - box.yMin;
- if (width < border_x * 2 || height < border_y * 2) {
- valid_cont[i] = 0;
- modified = 1;
- }
- }
- }
-
- // if we need to modify the outline, rewrite it and skip
- // the contours that we determined should be removed.
- if (modified) {
- int p = 0, c = 0;
- for (i = 0; i < nc; i++) {
- if (!valid_cont[i])
- continue;
- begin = (i == 0) ? 0 : outline->contours[i - 1] + 1;
- stop = outline->contours[i];
- for (j = begin; j <= stop; j++) {
- outline->points[p].x = outline->points[j].x;
- outline->points[p].y = outline->points[j].y;
- outline->tags[p] = outline->tags[j];
- p++;
- }
- outline->contours[c] = p - 1;
- c++;
- }
- outline->n_points = p;
- outline->n_contours = c;
- }
-
- free(boxes);
- free(valid_cont);
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-03 01:26:07 +0000