Pango::Renderer is a base class that contains the necessary logic for rendering a Pango::Layout or Pango::LayoutLine. More...
Public Member Functions | |
virtual | ~Renderer () |
PangoRenderer* | gobj () |
Provides access to the underlying C GObject. | |
const PangoRenderer* | gobj () const |
Provides access to the underlying C GObject. | |
PangoRenderer* | gobj_copy () |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. | |
void | draw_layout (const Glib::RefPtr< Layout >& layout, int x, int y) |
Draws layout with the specified Pango::Renderer. | |
void | draw_layout_line (const Glib::RefPtr< LayoutLine >& line, int x, int y) |
Draws line with the specified Pango::Renderer. | |
void | draw_glyphs (const Glib::RefPtr< Font >& font, const GlyphString& glyphs, int x, int y) |
Draws the glyphs in glyphs with the specified Pango::Renderer. | |
void | draw_glyph_item (const Glib::ustring& text, const GlyphItem& glyph_item, int x, int y) |
Draws the glyphs in glyph_item with the specified Pango::Renderer, embedding the text associated with the glyphs in the output if the output format supports it (PDF for example). | |
void | draw_rectangle (RenderPart part, int x, int y, int width, int height) |
Draws an axis-aligned rectangle in user space coordinates with the specified Pango::Renderer. | |
void | draw_error_underline (int x, int y, int width, int height) |
Draw a squiggly line that approximately covers the given rectangle in the style of an underline used to indicate a spelling error. | |
void | draw_trapezoid (RenderPart part, double y1, double x11, double x21, double y2, double x12, double x22) |
Draws a trapezoid with the parallel sides aligned with the X axis using the given Pango::Renderer; coordinates are in device space. | |
void | draw_glyph (const Glib::RefPtr< Font >& font, Glyph glyph, double x, double y) |
Draws a single glyph with coordinates in device space. | |
void | activate () |
Does initial setup before rendering operations on renderer. | |
void | deactivate () |
Cleans up after rendering operations on renderer. | |
void | part_changed (RenderPart part) |
Informs Pango that the way that the rendering is done for part has changed in a way that would prevent multiple pieces being joined together into one drawing call. | |
void | set_color (RenderPart part, const Color& color) |
Sets the color for part of the rendering. | |
Color | get_color (RenderPart part) const |
Gets the current rendering color for the specified part. | |
void | set_matrix (const Matrix& matrix) |
Sets the transformation matrix that will be applied when rendering. | |
Matrix | get_matrix () const |
Glib::RefPtr< Layout > | get_layout () |
Gets the layout currently being rendered using renderer. | |
Glib::RefPtr< const Layout > | get_layout () const |
Gets the layout currently being rendered using renderer. | |
Glib::RefPtr< LayoutLine > | get_layout_line () |
Gets the layout line currently being rendered using renderer. | |
Glib::RefPtr< const LayoutLine > | get_layout_line () const |
Gets the layout line currently being rendered using renderer. | |
Related Functions | |
(Note that these are not member functions.) | |
Glib::RefPtr< Pango::Renderer > | wrap (PangoRenderer* object, bool take_copy=false) |
A Glib::wrap() method for this object. |
Pango::Renderer is a base class that contains the necessary logic for rendering a Pango::Layout or Pango::LayoutLine.
By subclassing Pango::Renderer and overriding operations such as draw_glyphs and draw_rectangle, renderers for particular font backends and destinations can be created.
virtual Pango::Renderer::~Renderer | ( | ) | [virtual] |
void Pango::Renderer::activate | ( | ) |
Does initial setup before rendering operations on renderer.
deactivate() should be called when done drawing. Calls such as draw_layout() automatically activate the layout before drawing on it. Calls to activate() and deactivate() can be nested and the renderer will only be initialized and deinitialized once.
void Pango::Renderer::deactivate | ( | ) |
void Pango::Renderer::draw_error_underline | ( | int | x, |
int | y, | ||
int | width, | ||
int | height | ||
) |
Draw a squiggly line that approximately covers the given rectangle in the style of an underline used to indicate a spelling error.
(The width of the underline is rounded to an integer number of up/down segments and the resulting rectangle is centered in the original rectangle)
This should be called while renderer is already active. Use activate() to activate a renderer.
void Pango::Renderer::draw_glyph | ( | const Glib::RefPtr< Font >& | font, |
Glyph | glyph, | ||
double | x, | ||
double | y | ||
) |
Draws a single glyph with coordinates in device space.
font | A Pango::Font. |
glyph | The glyph index of a single glyph. |
x | X coordinate of left edge of baseline of glyph. |
y | Y coordinate of left edge of baseline of glyph. |
void Pango::Renderer::draw_glyph_item | ( | const Glib::ustring & | text, |
const GlyphItem& | glyph_item, | ||
int | x, | ||
int | y | ||
) |
Draws the glyphs in glyph_item with the specified Pango::Renderer, embedding the text associated with the glyphs in the output if the output format supports it (PDF for example).
Note that text is the start of the text for layout, which is then indexed by glyph_item->item->offset
.
If text is 0
, this simply calls draw_glyphs().
The default implementation of this method simply falls back to draw_glyphs().
text | The UTF-8 text that glyph_item refers to, or 0 . |
glyph_item | A Pango::GlyphItem. |
x | X position of left edge of baseline, in user space coordinates in Pango units. |
y | Y position of left edge of baseline, in user space coordinates in Pango units. |
void Pango::Renderer::draw_glyphs | ( | const Glib::RefPtr< Font >& | font, |
const GlyphString& | glyphs, | ||
int | x, | ||
int | y | ||
) |
Draws the glyphs in glyphs with the specified Pango::Renderer.
font | A Pango::Font. |
glyphs | A Pango::GlyphString. |
x | X position of left edge of baseline, in user space coordinates in Pango units. |
y | Y position of left edge of baseline, in user space coordinates in Pango units. |
void Pango::Renderer::draw_layout | ( | const Glib::RefPtr< Layout >& | layout, |
int | x, | ||
int | y | ||
) |
Draws layout with the specified Pango::Renderer.
layout | A Pango::Layout. |
x | X position of left edge of baseline, in user space coordinates in Pango units. |
y | Y position of left edge of baseline, in user space coordinates in Pango units. |
void Pango::Renderer::draw_layout_line | ( | const Glib::RefPtr< LayoutLine >& | line, |
int | x, | ||
int | y | ||
) |
Draws line with the specified Pango::Renderer.
line | A Pango::LayoutLine. |
x | X position of left edge of baseline, in user space coordinates in Pango units. |
y | Y position of left edge of baseline, in user space coordinates in Pango units. |
void Pango::Renderer::draw_rectangle | ( | RenderPart | part, |
int | x, | ||
int | y, | ||
int | width, | ||
int | height | ||
) |
Draws an axis-aligned rectangle in user space coordinates with the specified Pango::Renderer.
This should be called while renderer is already active. Use activate() to activate a renderer.
part | Type of object this rectangle is part of. |
x | X position at which to draw rectangle, in user space coordinates in Pango units. |
y | Y position at which to draw rectangle, in user space coordinates in Pango units. |
width | Width of rectangle in Pango units in user space coordinates. |
height | Height of rectangle in Pango units in user space coordinates. |
void Pango::Renderer::draw_trapezoid | ( | RenderPart | part, |
double | y1, | ||
double | x11, | ||
double | x21, | ||
double | y2, | ||
double | x12, | ||
double | x22 | ||
) |
Draws a trapezoid with the parallel sides aligned with the X axis using the given Pango::Renderer; coordinates are in device space.
part | Type of object this trapezoid is part of. |
y1 | Y coordinate of top of trapezoid. |
x11 | X coordinate of left end of top of trapezoid. |
x21 | X coordinate of right end of top of trapezoid. |
y2 | Y coordinate of bottom of trapezoid. |
x12 | X coordinate of left end of bottom of trapezoid. |
x22 | X coordinate of right end of bottom of trapezoid. |
Color Pango::Renderer::get_color | ( | RenderPart | part ) | const |
Gets the current rendering color for the specified part.
part | The part to get the color for. |
0
if it hasn't been set and should be inherited from the environment. Glib::RefPtr<Layout> Pango::Renderer::get_layout | ( | ) |
Gets the layout currently being rendered using renderer.
Calling this function only makes sense from inside a subclass's methods, like in its draw_shape() for example.
The returned layout should not be modified while still being rendered.
0
if no layout is being rendered using renderer at this time. Glib::RefPtr<const Layout> Pango::Renderer::get_layout | ( | ) | const |
Gets the layout currently being rendered using renderer.
Calling this function only makes sense from inside a subclass's methods, like in its draw_shape() for example.
The returned layout should not be modified while still being rendered.
0
if no layout is being rendered using renderer at this time. Glib::RefPtr<LayoutLine> Pango::Renderer::get_layout_line | ( | ) |
Gets the layout line currently being rendered using renderer.
Calling this function only makes sense from inside a subclass's methods, like in its draw_shape() for example.
The returned layout line should not be modified while still being rendered.
0
if no layout line is being rendered using renderer at this time. Glib::RefPtr<const LayoutLine> Pango::Renderer::get_layout_line | ( | ) | const |
Gets the layout line currently being rendered using renderer.
Calling this function only makes sense from inside a subclass's methods, like in its draw_shape() for example.
The returned layout line should not be modified while still being rendered.
0
if no layout line is being rendered using renderer at this time. Matrix Pango::Renderer::get_matrix | ( | ) | const |
const PangoRenderer* Pango::Renderer::gobj | ( | ) | const [inline] |
Provides access to the underlying C GObject.
Reimplemented from Glib::ObjectBase.
PangoRenderer* Pango::Renderer::gobj | ( | ) | [inline] |
Provides access to the underlying C GObject.
Reimplemented from Glib::ObjectBase.
PangoRenderer* Pango::Renderer::gobj_copy | ( | ) |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
void Pango::Renderer::part_changed | ( | RenderPart | part ) |
Informs Pango that the way that the rendering is done for part has changed in a way that would prevent multiple pieces being joined together into one drawing call.
For instance, if a subclass of Pango::Renderer was to add a stipple option for drawing underlines, it needs to call
pango_renderer_part_changed (render, PANGO_RENDER_PART_UNDERLINE);
When the stipple changes or underlines with different stipples might be joined together. Pango automatically calls this for changes to colors. (See set_color())
part | The part for which rendering has changed. |
void Pango::Renderer::set_color | ( | RenderPart | part, |
const Color& | color | ||
) |
Sets the color for part of the rendering.
part | The part to change the color of. |
color | The new color or 0 to unset the current color. |
void Pango::Renderer::set_matrix | ( | const Matrix& | matrix ) |
Sets the transformation matrix that will be applied when rendering.
matrix | A Pango::Matrix, or 0 to unset any existing matrix. (No matrix set is the same as setting the identity matrix.). |
Glib::RefPtr< Pango::Renderer > wrap | ( | PangoRenderer * | object, |
bool | take_copy = false |
||
) | [related] |
A Glib::wrap() method for this object.
object | The C instance. |
take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref. |