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86 lines
3.0 KiB
Diff
86 lines
3.0 KiB
Diff
From: Robert O'Callahan <robert@ocallahan.org>
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Bug 768348. Avoid ExtCreatePen failures by avoiding rounding widths and dash lengths down to zero. r=jrmuizel
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diff --git a/gfx/cairo/cairo/src/cairo-win32-printing-surface.c b/gfx/cairo/cairo/src/cairo-win32-printing-surface.c
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--- a/gfx/cairo/cairo/src/cairo-win32-printing-surface.c
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+++ b/gfx/cairo/cairo/src/cairo-win32-printing-surface.c
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@@ -1251,22 +1251,24 @@ static cairo_int_status_t
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{
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cairo_win32_surface_t *surface = abstract_surface;
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cairo_int_status_t status;
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HPEN pen;
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LOGBRUSH brush;
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COLORREF color;
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XFORM xform;
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DWORD pen_style;
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+ DWORD pen_width;
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DWORD *dash_array;
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HGDIOBJ obj;
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unsigned int i;
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cairo_solid_pattern_t clear;
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cairo_matrix_t mat;
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double scale;
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+ double scaled_width;
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status = _cairo_surface_clipper_set_clip (&surface->clipper, clip);
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if (status)
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return status;
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if (op == CAIRO_OPERATOR_CLEAR) {
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_cairo_win32_printing_surface_init_clear_color (surface, &clear);
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source = (cairo_pattern_t*) &clear;
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@@ -1288,17 +1290,21 @@ static cairo_int_status_t
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_cairo_matrix_factor_out_scale (&mat, &scale);
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pen_style = PS_GEOMETRIC;
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dash_array = NULL;
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if (style->num_dashes) {
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pen_style |= PS_USERSTYLE;
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dash_array = calloc (sizeof (DWORD), style->num_dashes);
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for (i = 0; i < style->num_dashes; i++) {
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- dash_array[i] = (DWORD) (scale * style->dash[i]);
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+ DWORD dashes = (DWORD) (scale * style->dash[i]);
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+ /* zero dash-lengths cause ExtCreatePen to fail. Make the dashes
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+ * longer if necessary.
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+ */
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+ dash_array[i] = MAX(1, dashes);
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}
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} else {
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pen_style |= PS_SOLID;
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}
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SetMiterLimit (surface->dc, (FLOAT) (style->miter_limit), NULL);
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if (source->type == CAIRO_PATTERN_TYPE_SOLID) {
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cairo_solid_pattern_t *solid = (cairo_solid_pattern_t *) source;
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@@ -1310,18 +1316,29 @@ static cairo_int_status_t
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/* Color not used as the pen will only be used by WidenPath() */
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color = RGB (0,0,0);
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}
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brush.lbStyle = BS_SOLID;
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brush.lbColor = color;
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brush.lbHatch = 0;
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pen_style |= _cairo_win32_line_cap (style->line_cap);
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pen_style |= _cairo_win32_line_join (style->line_join);
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+ scaled_width = scale * style->line_width;
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+ if (scaled_width == 0.0)
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+ return status;
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+ pen_width = (DWORD)scaled_width;
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+ if (pen_width == 0) {
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+ /* ExtCreatePen will fail if passed zero width. We have to choose
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+ * between drawing something too wide, or drawing nothing at all.
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+ * Let's draw something.
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+ */
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+ pen_width = 1;
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+ }
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pen = ExtCreatePen(pen_style,
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- scale * style->line_width,
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+ pen_width,
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&brush,
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style->num_dashes,
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dash_array);
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if (pen == NULL)
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return _cairo_win32_print_gdi_error ("_win32_surface_stroke:ExtCreatePen");
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obj = SelectObject (surface->dc, pen);
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if (obj == NULL)
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return _cairo_win32_print_gdi_error ("_win32_surface_stroke:SelectObject");
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