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SVG: dumb implementation of bitmap glyphs.

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Bitmap glyphs are emited as tiny svg rectangles. An improvement would be
to calculate glyph outline from bitmap data.
This commit is contained in:
Emmanuel Pacaud 2006-06-22 22:32:47 +02:00
parent cd5eb70e4e
commit d5197c1e0d
1 changed files with 32 additions and 7 deletions
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39
src/cairo-svg-surface.c
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@ -533,8 +533,15 @@ _cairo_svg_document_emit_bitmap_glyph_data (cairo_svg_document_t *document,
cairo_scaled_font_t *scaled_font,
unsigned long glyph_index)
{
cairo_image_surface_t *image;
cairo_scaled_glyph_t *scaled_glyph;
cairo_status_t status;
cairo_matrix_t *matrix;
unsigned char *row, *byte;
double pixel_height, pixel_width;
double pixel_x, pixel_y;
int rows, cols, bytes_per_row;
int x, y, bit;
status = _cairo_scaled_glyph_lookup (scaled_font,
glyph_index,
@ -544,13 +551,31 @@ _cairo_svg_document_emit_bitmap_glyph_data (cairo_svg_document_t *document,
if (status)
return status;
/* XXX: Should be painting the surface from scaled_glyph here, not just a filled rectangle. */
_cairo_output_stream_printf (document->xml_node_glyphs,
"<rect style=\"stroke: none;\" x=\"%f\" y=\"%f\" width=\"%f\" height=\"%f\"/>\n",
_cairo_fixed_to_double (scaled_glyph->bbox.p1.x),
_cairo_fixed_to_double (scaled_glyph->bbox.p1.y),
_cairo_fixed_to_double (scaled_glyph->bbox.p2.x) - _cairo_fixed_to_double (scaled_glyph->bbox.p1.x),
_cairo_fixed_to_double (scaled_glyph->bbox.p2.y) - _cairo_fixed_to_double (scaled_glyph->bbox.p1.y));
image = scaled_glyph->surface;
assert (image->format == CAIRO_FORMAT_A1);
matrix = &image->base.device_transform;
pixel_height = 1;
pixel_width = 1;
cairo_matrix_transform_distance (matrix, &pixel_width, &pixel_height);
bytes_per_row = (image->width + 7) / 8;
for (y = 0, row = image->data, rows = image->height; rows; row += image->stride, rows--, y++) {
for (x = 0, byte = row, cols = (image->width + 7) / 8; cols; byte++, cols--) {
unsigned char output_byte = *byte;
for (bit = 0; bit < 8 && x < image->width; bit++, x++) {
if (output_byte & 1) {
pixel_x = x;
pixel_y = y;
cairo_matrix_transform_point (matrix, &pixel_x, &pixel_y);
_cairo_output_stream_printf (document->xml_node_glyphs,
"<rect x=\"%f\" y=\"%f\" width=\"%f\" height=\"%f\"/>\n",
pixel_x, pixel_y, pixel_width, pixel_height);
}
output_byte = output_byte >> 1;
}
}
}
return CAIRO_STATUS_SUCCESS;
}