diff options
Diffstat (limited to 'src/cairo-win32-printing-surface.c')
| -rw-r--r-- | src/cairo-win32-printing-surface.c | 90 |
1 files changed, 71 insertions, 19 deletions
diff --git a/src/cairo-win32-printing-surface.c b/src/cairo-win32-printing-surface.c index ea5dd35b..00a84a39 100644 --- a/src/cairo-win32-printing-surface.c +++ b/src/cairo-win32-printing-surface.c @@ -354,11 +354,13 @@ _cairo_win32_printing_surface_get_ctm_clip_box (cairo_win32_surface_t *surface, XFORM xform; _cairo_matrix_to_win32_xform (&surface->ctm, &xform); + if (!ModifyWorldTransform (surface->dc, &xform, MWT_LEFTMULTIPLY)) + return _cairo_win32_print_gdi_error ("_cairo_win32_printing_surface_get_clip_box:ModifyWorldTransform"); + GetClipBox (surface->dc, clip); + + _cairo_matrix_to_win32_xform (&surface->gdi_ctm, &xform); if (!SetWorldTransform (surface->dc, &xform)) return _cairo_win32_print_gdi_error ("_cairo_win32_printing_surface_get_clip_box:SetWorldTransform"); - GetClipBox (surface->dc, clip); - if (!ModifyWorldTransform (surface->dc, &xform, MWT_IDENTITY)) - return _cairo_win32_print_gdi_error ("_cairo_win32_printing_surface_get_clip_box:ModifyWorldTransform"); return CAIRO_STATUS_SUCCESS; } @@ -716,7 +718,7 @@ _cairo_win32_printing_surface_paint_image_pattern (cairo_win32_surface_t *surf /* _cairo_pattern_set_matrix guarantees invertibility */ assert (status == CAIRO_STATUS_SUCCESS); - cairo_matrix_multiply (&m, &m, &surface->ctm); + cairo_matrix_multiply (&m, &m, &surface->gdi_ctm); SaveDC (surface->dc); _cairo_matrix_to_win32_xform (&m, &xform); @@ -1340,7 +1342,7 @@ _cairo_win32_printing_surface_stroke (void *abstract_surface, xform.eDx = 0.0f; xform.eDy = 0.0f; - if (!SetWorldTransform (surface->dc, &xform)) + if (!ModifyWorldTransform (surface->dc, &xform, MWT_LEFTMULTIPLY)) return _cairo_win32_print_gdi_error ("_win32_surface_stroke:SetWorldTransform"); if (source->type == CAIRO_PATTERN_TYPE_SOLID) { @@ -1352,7 +1354,8 @@ _cairo_win32_printing_surface_stroke (void *abstract_surface, return _cairo_win32_print_gdi_error ("_win32_surface_stroke:SelectClipPath"); /* Return to device space to paint the pattern */ - if (!ModifyWorldTransform (surface->dc, &xform, MWT_IDENTITY)) + _cairo_matrix_to_win32_xform (&surface->gdi_ctm, &xform); + if (!SetWorldTransform (surface->dc, &xform)) return _cairo_win32_print_gdi_error ("_win32_surface_stroke:ModifyWorldTransform"); status = _cairo_win32_printing_surface_paint_pattern (surface, source); } @@ -1551,10 +1554,11 @@ _cairo_win32_printing_surface_show_glyphs (void *abstract_surfac glyphs = type1_glyphs; } - if (surface->has_ctm) { + if (surface->has_ctm || surface->has_gdi_ctm) { + cairo_matrix_multiply (&ctm, &surface->ctm, &surface->gdi_ctm); for (i = 0; i < num_glyphs; i++) - cairo_matrix_transform_point (&surface->ctm, &glyphs[i].x, &glyphs[i].y); - cairo_matrix_multiply (&ctm, &scaled_font->ctm, &surface->ctm); + cairo_matrix_transform_point (&ctm, &glyphs[i].x, &glyphs[i].y); + cairo_matrix_multiply (&ctm, &scaled_font->ctm, &ctm); scaled_font = cairo_scaled_font_create (scaled_font->font_face, &scaled_font->font_matrix, &ctm, @@ -1642,16 +1646,67 @@ _cairo_win32_printing_surface_start_page (void *abstract_surface) SaveDC (surface->dc); /* Save application context first, before doing MWT */ + /* As the logical coordinates used by GDI functions (eg LineTo) + * are integers we need to do some additional work to prevent + * rounding errors. For example the obvious way to paint a meta + * pattern is to: + * + * SaveDC() + * transform the device context DC by the pattern to device matrix + * replay the meta surface + * RestoreDC() + * + * The problem here is that if the pattern to device matrix is + * [100 0 0 100 0 0], coordinates in the meta pattern such as + * (1.56, 2.23) which correspond to (156, 223) in device space + * will be rounded to (100, 200) due to (1.56, 2.23) being + * truncated to integers. + * + * This is solved by saving the current GDI CTM in surface->ctm, + * switch the GDI CTM to identity, and transforming all + * coordinates by surface->ctm before passing them to GDI. When + * painting a meta pattern, surface->ctm is transformed by the + * pattern to device matrix. + * + * For printing device contexts where 1 unit is 1 dpi, switching + * the GDI CTM to identity maximises the possible resolution of + * coordinates. + * + * If the device context is an EMF file, using an identity + * transform often provides insufficent resolution. The workaround + * is to set the GDI CTM to a scale < 1 eg [1.0/16 0 0 1/0/16 0 0] + * and scale the cairo CTM by [16 0 0 16 0 0]. The + * SetWorldTransform function call to scale the GDI CTM by 1.0/16 + * will be recorded in the EMF followed by all the graphics + * functions by their coordinateds multiplied by 16. + * + * To support allowing the user to set a GDI CTM with scale < 1, + * we avoid switching to an identity CTM if the CTM xx and yy is < 1. + */ SetGraphicsMode (surface->dc, GM_ADVANCED); GetWorldTransform(surface->dc, &xform); - surface->ctm.xx = xform.eM11; - surface->ctm.xy = xform.eM21; - surface->ctm.yx = xform.eM12; - surface->ctm.yy = xform.eM22; - surface->ctm.x0 = xform.eDx; - surface->ctm.y0 = xform.eDy; - surface->has_ctm = !_cairo_matrix_is_identity (&surface->ctm); + if (xform.eM11 < 1 && xform.eM22 < 1) { + cairo_matrix_init_identity (&surface->ctm); + surface->gdi_ctm.xx = xform.eM11; + surface->gdi_ctm.xy = xform.eM21; + surface->gdi_ctm.yx = xform.eM12; + surface->gdi_ctm.yy = xform.eM22; + surface->gdi_ctm.x0 = xform.eDx; + surface->gdi_ctm.y0 = xform.eDy; + } else { + surface->ctm.xx = xform.eM11; + surface->ctm.xy = xform.eM21; + surface->ctm.yx = xform.eM12; + surface->ctm.yy = xform.eM22; + surface->ctm.x0 = xform.eDx; + surface->ctm.y0 = xform.eDy; + cairo_matrix_init_identity (&surface->gdi_ctm); + if (!ModifyWorldTransform (surface->dc, NULL, MWT_IDENTITY)) + return _cairo_win32_print_gdi_error ("_cairo_win32_printing_surface_start_page:ModifyWorldTransform"); + } + surface->has_ctm = !_cairo_matrix_is_identity (&surface->ctm); + surface->has_gdi_ctm = !_cairo_matrix_is_identity (&surface->gdi_ctm); inverse_ctm = surface->ctm; status = cairo_matrix_invert (&inverse_ctm); if (status) @@ -1662,9 +1717,6 @@ _cairo_win32_printing_surface_start_page (void *abstract_surface) cairo_matrix_transform_distance (&inverse_ctm, &x_res, &y_res); _cairo_surface_set_resolution (&surface->base, x_res, y_res); - if (!ModifyWorldTransform (surface->dc, NULL, MWT_IDENTITY)) - return _cairo_win32_print_gdi_error ("_cairo_win32_printing_surface_start_page:ModifyWorldTransform"); - SaveDC (surface->dc); /* Then save Cairo's known-good clip state, so the clip path can be reset */ return CAIRO_STATUS_SUCCESS; |