diff options
Diffstat (limited to 'src/cairo_ft_font.c')
| -rw-r--r-- | src/cairo_ft_font.c | 248 |
1 files changed, 171 insertions, 77 deletions
diff --git a/src/cairo_ft_font.c b/src/cairo_ft_font.c index c1c8d6ea0..5b0a7f641 100644 --- a/src/cairo_ft_font.c +++ b/src/cairo_ft_font.c @@ -29,6 +29,7 @@ #include <ft2build.h> #include FT_FREETYPE_H #include FT_OUTLINE_H +#include FT_IMAGE_H typedef struct { cairo_font_t base; @@ -464,23 +465,99 @@ _cairo_ft_font_text_extents (void *abstract_font, } static cairo_status_t +_cairo_ft_font_glyph_bbox (void *abstract_font, + cairo_surface_t *surface, + const cairo_glyph_t *glyphs, + int num_glyphs, + cairo_box_t *bbox) +{ + cairo_ft_font_t *font = abstract_font; + cairo_surface_t *mask = NULL; + cairo_glyph_size_t size; + + cairo_fixed_t x1, y1, x2, y2; + int i; + + bbox->p1.x = bbox->p1.y = CAIRO_MAXSHORT << 16; + bbox->p2.x = bbox->p2.y = CAIRO_MINSHORT << 16; + + if (font == NULL + || surface == NULL + || glyphs == NULL) + return CAIRO_STATUS_NO_MEMORY; + + for (i = 0; i < num_glyphs; i++) + { + mask = _cairo_font_lookup_glyph (&font->base, surface, + &glyphs[i], &size); + if (mask == NULL) + continue; + + x1 = _cairo_fixed_from_double (glyphs[i].x + size.x); + y1 = _cairo_fixed_from_double (glyphs[i].y - size.y); + x2 = x1 + _cairo_fixed_from_double (size.width); + y2 = y1 + _cairo_fixed_from_double (size.height); + + if (x1 < bbox->p1.x) + bbox->p1.x = x1; + + if (y1 < bbox->p1.y) + bbox->p1.y = y1; + + if (x2 > bbox->p2.x) + bbox->p2.x = x2; + + if (y2 > bbox->p2.y) + bbox->p2.y = y2; + + if (mask) + cairo_surface_destroy (mask); + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_ft_font_text_bbox (void *abstract_font, + cairo_surface_t *surface, + double x0, + double y0, + const unsigned char *utf8, + cairo_box_t *bbox) +{ + cairo_ft_font_t *font = abstract_font; + cairo_glyph_t *glyphs; + size_t num_glyphs; + + if (_utf8_to_glyphs (font, utf8, x0, y0, &glyphs, &num_glyphs)) + { + cairo_status_t res; + res = _cairo_ft_font_glyph_bbox (font, surface, + glyphs, num_glyphs, bbox); + free (glyphs); + return res; + } + else + return CAIRO_STATUS_NO_MEMORY; +} + +static cairo_status_t _cairo_ft_font_show_glyphs (void *abstract_font, cairo_operator_t operator, cairo_surface_t *source, - cairo_surface_t *surface, + cairo_surface_t *surface, + int source_x, + int source_y, const cairo_glyph_t *glyphs, int num_glyphs) { cairo_ft_font_t *font = abstract_font; cairo_status_t status; - int i; - cairo_ft_font_t *ft = NULL; - FT_GlyphSlot glyphslot; cairo_surface_t *mask = NULL; - cairo_point_double_t origin; + cairo_glyph_size_t size; double x, y; - int width, height, stride; + int i; if (font == NULL || source == NULL @@ -488,84 +565,27 @@ _cairo_ft_font_show_glyphs (void *abstract_font, || glyphs == NULL) return CAIRO_STATUS_NO_MEMORY; - ft = (cairo_ft_font_t *)font; - glyphslot = ft->face->glyph; - _install_font_matrix (&font->base.matrix, ft->face); - for (i = 0; i < num_glyphs; i++) { - unsigned char *bitmap; - - FT_Load_Glyph (ft->face, glyphs[i].index, FT_LOAD_DEFAULT); - FT_Render_Glyph (glyphslot, ft_render_mode_normal); - - width = glyphslot->bitmap.width; - height = glyphslot->bitmap.rows; - stride = glyphslot->bitmap.pitch; - bitmap = glyphslot->bitmap.buffer; + mask = _cairo_font_lookup_glyph (&font->base, surface, + &glyphs[i], &size); + if (mask == NULL) + continue; x = glyphs[i].x; y = glyphs[i].y; - if (i == 0) { - origin.x = x; - origin.y = y; - } - - /* X gets upset with zero-sized images (such as whitespace) */ - if (width * height == 0) - continue; - - /* - * XXX - * reformat to match libic alignment requirements. - * This should be done before rendering the glyph, - * but that requires using FT_Outline_Get_Bitmap - * function - */ - if (stride & 3) - { - int nstride = (stride + 3) & ~3; - unsigned char *g, *b; - int h; - - bitmap = malloc (nstride * height); - if (!bitmap) - return CAIRO_STATUS_NO_MEMORY; - g = glyphslot->bitmap.buffer; - b = bitmap; - h = height; - while (h--) - { - memcpy (b, g, width); - b += nstride; - g += stride; - } - stride = nstride; - } - mask = cairo_surface_create_for_image (bitmap, - CAIRO_FORMAT_A8, - width, height, stride); - if (mask == NULL) - { - if (bitmap != glyphslot->bitmap.buffer) - free (bitmap); - return CAIRO_STATUS_NO_MEMORY; - } - - status = - _cairo_surface_composite (operator, source, mask, surface, - -origin.x + x + glyphslot->bitmap_left, - -origin.y + y - glyphslot->bitmap_top, - 0, 0, - x + glyphslot->bitmap_left, - y - glyphslot->bitmap_top, - (double) width, (double) height); + status = _cairo_surface_composite (operator, source, mask, surface, + source_x + x + size.x, + source_y + y - size.y, + 0, 0, + x + size.x, + y - size.y, + (double) size.width, + (double) size.height); cairo_surface_destroy (mask); - if (bitmap != glyphslot->bitmap.buffer) - free (bitmap); - + if (status) return status; } @@ -577,19 +597,22 @@ _cairo_ft_font_show_text (void *abstract_font, cairo_operator_t operator, cairo_surface_t *source, cairo_surface_t *surface, + int source_x, + int source_y, double x0, double y0, const unsigned char *utf8) { cairo_ft_font_t *font = abstract_font; cairo_glyph_t *glyphs; - int num_glyphs; + size_t num_glyphs; if (_utf8_to_glyphs (font, utf8, x0, y0, &glyphs, &num_glyphs)) { cairo_status_t res; res = _cairo_ft_font_show_glyphs (font, operator, source, surface, + source_x, source_y, glyphs, num_glyphs); free (glyphs); return res; @@ -768,6 +791,74 @@ cairo_ft_font_create_for_ft_face (FT_Face face) return (cairo_font_t *) f; } +static cairo_surface_t * +_cairo_ft_font_create_glyph (void *abstract_font, + const cairo_glyph_t *glyph, + cairo_glyph_size_t *return_size) +{ + cairo_ft_font_t *font = abstract_font; + cairo_image_surface_t *image; + FT_GlyphSlot glyphslot; + unsigned int width, height, stride; + FT_Outline *outline; + FT_BBox cbox; + FT_Bitmap bitmap; + + glyphslot = font->face->glyph; + _install_font_matrix (&font->base.matrix, font->face); + + FT_Load_Glyph (font->face, glyph->index, FT_LOAD_DEFAULT); + + outline = &glyphslot->outline; + + FT_Outline_Get_CBox (outline, &cbox); + + cbox.xMin &= -64; + cbox.yMin &= -64; + cbox.xMax = (cbox.xMax + 63) & -64; + cbox.yMax = (cbox.yMax + 63) & -64; + + width = (unsigned int) ((cbox.xMax - cbox.xMin) >> 6); + height = (unsigned int) ((cbox.yMax - cbox.yMin) >> 6); + stride = (width + 3) & -4; + + bitmap.pixel_mode = ft_pixel_mode_grays; + bitmap.num_grays = 256; + bitmap.width = width; + bitmap.rows = height; + bitmap.pitch = stride; + + if (width * height == 0) + return NULL; + + bitmap.buffer = malloc (stride * height); + if (bitmap.buffer == NULL) + return NULL; + + memset (bitmap.buffer, 0x0, stride * height); + + FT_Outline_Translate (outline, -cbox.xMin, -cbox.yMin); + FT_Outline_Get_Bitmap (glyphslot->library, outline, &bitmap); + + image = (cairo_image_surface_t *) + cairo_image_surface_create_for_data ((char *) bitmap.buffer, + CAIRO_FORMAT_A8, + width, height, stride); + if (image == NULL) { + free (bitmap.buffer); + return NULL; + } + + _cairo_image_surface_assume_ownership_of_data (image); + + return_size->width = (unsigned short) width; + return_size->height = (unsigned short) height; + return_size->x = (short) (cbox.xMin >> 6); + return_size->y = (short) (cbox.yMax >> 6); + + return &image->base; +} + const struct cairo_font_backend cairo_ft_font_backend = { _cairo_ft_font_create, _cairo_ft_font_copy, @@ -775,8 +866,11 @@ const struct cairo_font_backend cairo_ft_font_backend = { _cairo_ft_font_font_extents, _cairo_ft_font_text_extents, _cairo_ft_font_glyph_extents, + _cairo_ft_font_text_bbox, + _cairo_ft_font_glyph_bbox, _cairo_ft_font_show_text, _cairo_ft_font_show_glyphs, _cairo_ft_font_text_path, _cairo_ft_font_glyph_path, + _cairo_ft_font_create_glyph }; 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