added some features in cairo & gdk

cairo/canvas.go

@@ -0,0 +1,397 @@
+package cairo
+
+// #cgo pkg-config: cairo cairo-gobject
+// #include <stdlib.h>
+// #include <cairo.h>
+// #include <cairo-gobject.h>
+import "C"
+
+import (
+	"reflect"
+	"runtime"
+	"unsafe"
+)
+
+// Context is a representation of Cairo's cairo_t.
+type Context struct {
+	context *C.cairo_t
+}
+
+// native returns a pointer to the underlying cairo_t.
+func (v *Context) native() *C.cairo_t {
+	if v == nil {
+		return nil
+	}
+	return v.context
+}
+
+// Native returns a pointer to the underlying cairo_t.
+func (v *Context) Native() uintptr {
+	return uintptr(unsafe.Pointer(v.native()))
+}
+
+func marshalContext(p uintptr) (interface{}, error) {
+	c := C.g_value_get_boxed((*C.GValue)(unsafe.Pointer(p)))
+	context := (*C.cairo_t)(unsafe.Pointer(c))
+	return wrapContext(context), nil
+}
+
+func wrapContext(context *C.cairo_t) *Context {
+	return &Context{context}
+}
+
+// Create is a wrapper around cairo_create().
+func Create(target *Surface) *Context {
+	c := C.cairo_create(target.native())
+	ctx := wrapContext(c)
+	runtime.SetFinalizer(ctx, (*Context).destroy)
+	return ctx
+}
+
+// reference is a wrapper around cairo_reference().
+func (v *Context) reference() {
+	v.context = C.cairo_reference(v.native())
+}
+
+// destroy is a wrapper around cairo_destroy().
+func (v *Context) destroy() {
+	C.cairo_destroy(v.native())
+}
+
+// Status is a wrapper around cairo_status().
+func (v *Context) Status() Status {
+	c := C.cairo_status(v.native())
+	return Status(c)
+}
+
+// Save is a wrapper around cairo_save().
+func (v *Context) Save() {
+	C.cairo_save(v.native())
+}
+
+// Restore is a wrapper around cairo_restore().
+func (v *Context) Restore() {
+	C.cairo_restore(v.native())
+}
+
+// GetTarget is a wrapper around cairo_get_target().
+func (v *Context) GetTarget() *Surface {
+	c := C.cairo_get_target(v.native())
+	s := wrapSurface(c)
+	s.reference()
+	runtime.SetFinalizer(s, (*Surface).destroy)
+	return s
+}
+
+// PushGroup is a wrapper around cairo_push_group().
+func (v *Context) PushGroup() {
+	C.cairo_push_group(v.native())
+}
+
+// PushGroupWithContent is a wrapper around cairo_push_group_with_content().
+func (v *Context) PushGroupWithContent(content Content) {
+	C.cairo_push_group_with_content(v.native(), C.cairo_content_t(content))
+}
+
+// TODO(jrick) PopGroup (depends on Pattern)
+
+// PopGroupToSource is a wrapper around cairo_pop_group_to_source().
+func (v *Context) PopGroupToSource() {
+	C.cairo_pop_group_to_source(v.native())
+}
+
+// GetGroupTarget is a wrapper around cairo_get_group_target().
+func (v *Context) GetGroupTarget() *Surface {
+	c := C.cairo_get_group_target(v.native())
+	s := wrapSurface(c)
+	s.reference()
+	runtime.SetFinalizer(s, (*Surface).destroy)
+	return s
+}
+
+// SetSourceRGB is a wrapper around cairo_set_source_rgb().
+func (v *Context) SetSourceRGB(red, green, blue float64) {
+	C.cairo_set_source_rgb(v.native(), C.double(red), C.double(green),
+		C.double(blue))
+}
+
+// SetSourceRGBA is a wrapper around cairo_set_source_rgba().
+func (v *Context) SetSourceRGBA(red, green, blue, alpha float64) {
+	C.cairo_set_source_rgba(v.native(), C.double(red), C.double(green),
+		C.double(blue), C.double(alpha))
+}
+
+// TODO(jrick) SetSource (depends on Pattern)
+
+// SetSourceSurface is a wrapper around cairo_set_source_surface().
+func (v *Context) SetSourceSurface(surface *Surface, x, y float64) {
+	C.cairo_set_source_surface(v.native(), surface.native(), C.double(x),
+		C.double(y))
+}
+
+// TODO(jrick) GetSource (depends on Pattern)
+
+// SetAntialias is a wrapper around cairo_set_antialias().
+func (v *Context) SetAntialias(antialias Antialias) {
+	C.cairo_set_antialias(v.native(), C.cairo_antialias_t(antialias))
+}
+
+// GetAntialias is a wrapper around cairo_get_antialias().
+func (v *Context) GetAntialias() Antialias {
+	c := C.cairo_get_antialias(v.native())
+	return Antialias(c)
+}
+
+// SetDash is a wrapper around cairo_set_dash().
+func (v *Context) SetDash(dashes []float64, offset float64) {
+	header := (*reflect.SliceHeader)(unsafe.Pointer(&dashes))
+	cdashes := (*C.double)(unsafe.Pointer(header.Data))
+	C.cairo_set_dash(v.native(), cdashes, C.int(header.Len),
+		C.double(offset))
+}
+
+// GetDashCount is a wrapper around cairo_get_dash_count().
+func (v *Context) GetDashCount() int {
+	c := C.cairo_get_dash_count(v.native())
+	return int(c)
+}
+
+// GetDash is a wrapper around cairo_get_dash().
+func (v *Context) GetDash() (dashes []float64, offset float64) {
+	dashCount := v.GetDashCount()
+	cdashes := (*C.double)(C.calloc(8, C.size_t(dashCount)))
+	var coffset C.double
+	C.cairo_get_dash(v.native(), cdashes, &coffset)
+	header := (*reflect.SliceHeader)((unsafe.Pointer(&dashes)))
+	header.Data = uintptr(unsafe.Pointer(cdashes))
+	header.Len = dashCount
+	header.Cap = dashCount
+	return dashes, float64(coffset)
+}
+
+// SetFillRule is a wrapper around cairo_set_fill_rule().
+func (v *Context) SetFillRule(fillRule FillRule) {
+	C.cairo_set_fill_rule(v.native(), C.cairo_fill_rule_t(fillRule))
+}
+
+// GetFillRule is a wrapper around cairo_get_fill_rule().
+func (v *Context) GetFillRule() FillRule {
+	c := C.cairo_get_fill_rule(v.native())
+	return FillRule(c)
+}
+
+// SetLineCap is a wrapper around cairo_set_line_cap().
+func (v *Context) SetLineCap(lineCap LineCap) {
+	C.cairo_set_line_cap(v.native(), C.cairo_line_cap_t(lineCap))
+}
+
+// GetLineCap is a wrapper around cairo_get_line_cap().
+func (v *Context) GetLineCap() LineCap {
+	c := C.cairo_get_line_cap(v.native())
+	return LineCap(c)
+}
+
+// SetLineJoin is a wrapper around cairo_set_line_join().
+func (v *Context) SetLineJoin(lineJoin LineJoin) {
+	C.cairo_set_line_join(v.native(), C.cairo_line_join_t(lineJoin))
+}
+
+// GetLineJoin is a wrapper around cairo_get_line_join().
+func (v *Context) GetLineJoin() LineJoin {
+	c := C.cairo_get_line_join(v.native())
+	return LineJoin(c)
+}
+
+// SetLineWidth is a wrapper around cairo_set_line_width().
+func (v *Context) SetLineWidth(width float64) {
+	C.cairo_set_line_width(v.native(), C.double(width))
+}
+
+// GetLineWidth is a wrapper cairo_get_line_width().
+func (v *Context) GetLineWidth() float64 {
+	c := C.cairo_get_line_width(v.native())
+	return float64(c)
+}
+
+// SetMiterLimit is a wrapper around cairo_set_miter_limit().
+func (v *Context) SetMiterLimit(limit float64) {
+	C.cairo_set_miter_limit(v.native(), C.double(limit))
+}
+
+// GetMiterLimit is a wrapper around cairo_get_miter_limit().
+func (v *Context) GetMiterLimit() float64 {
+	c := C.cairo_get_miter_limit(v.native())
+	return float64(c)
+}
+
+// SetOperator is a wrapper around cairo_set_operator().
+func (v *Context) SetOperator(op Operator) {
+	C.cairo_set_operator(v.native(), C.cairo_operator_t(op))
+}
+
+// GetOperator is a wrapper around cairo_get_operator().
+func (v *Context) GetOperator() Operator {
+	c := C.cairo_get_operator(v.native())
+	return Operator(c)
+}
+
+// SetTolerance is a wrapper around cairo_set_tolerance().
+func (v *Context) SetTolerance(tolerance float64) {
+	C.cairo_set_tolerance(v.native(), C.double(tolerance))
+}
+
+// GetTolerance is a wrapper around cairo_get_tolerance().
+func (v *Context) GetTolerance() float64 {
+	c := C.cairo_get_tolerance(v.native())
+	return float64(c)
+}
+
+// Clip is a wrapper around cairo_clip().
+func (v *Context) Clip() {
+	C.cairo_clip(v.native())
+}
+
+// ClipPreserve is a wrapper around cairo_clip_preserve().
+func (v *Context) ClipPreserve() {
+	C.cairo_clip_preserve(v.native())
+}
+
+// ClipExtents is a wrapper around cairo_clip_extents().
+func (v *Context) ClipExtents() (x1, y1, x2, y2 float64) {
+	var cx1, cy1, cx2, cy2 C.double
+	C.cairo_clip_extents(v.native(), &cx1, &cy1, &cx2, &cy2)
+	return float64(cx1), float64(cy1), float64(cx2), float64(cy2)
+}
+
+// InClip is a wrapper around cairo_in_clip().
+func (v *Context) InClip(x, y float64) bool {
+	c := C.cairo_in_clip(v.native(), C.double(x), C.double(y))
+	return gobool(c)
+}
+
+// ResetClip is a wrapper around cairo_reset_clip().
+func (v *Context) ResetClip() {
+	C.cairo_reset_clip(v.native())
+}
+
+// Rectangle is a wrapper around cairo_rectangle().
+func (v *Context) Rectangle(x, y, w, h float64) {
+	C.cairo_rectangle(v.native(), C.double(x), C.double(y), C.double(w), C.double(h))
+}
+
+// Arc is a wrapper around cairo_arc().
+func (v *Context) Arc(xc, yc, radius, angle1, angle2 float64) {
+	C.cairo_arc(v.native(), C.double(xc), C.double(yc), C.double(radius), C.double(angle1), C.double(angle2))
+}
+
+// ArcNegative is a wrapper around cairo_arc_negative().
+func (v *Context) ArcNegative(xc, yc, radius, angle1, angle2 float64) {
+	C.cairo_arc_negative(v.native(), C.double(xc), C.double(yc), C.double(radius), C.double(angle1), C.double(angle2))
+}
+
+// LineTo is a wrapper around cairo_line_to().
+func (v *Context) LineTo(x, y float64) {
+	C.cairo_line_to(v.native(), C.double(x), C.double(y))
+}
+
+// CurveTo is a wrapper around cairo_curve_to().
+func (v *Context) CurveTo(x1, y1, x2, y2, x3, y3 float64) {
+	C.cairo_curve_to(v.native(), C.double(x1), C.double(y1), C.double(x2), C.double(y2), C.double(x3), C.double(y3))
+}
+
+// MoveTo is a wrapper around cairo_move_to().
+func (v *Context) MoveTo(x, y float64) {
+	C.cairo_move_to(v.native(), C.double(x), C.double(y))
+}
+
+// TODO(jrick) CopyRectangleList (depends on RectangleList)
+
+// Fill is a wrapper around cairo_fill().
+func (v *Context) Fill() {
+	C.cairo_fill(v.native())
+}
+
+// ClosePath is a wrapper around cairo_close_path().
+func (v *Context) ClosePath() {
+	C.cairo_close_path(v.native())
+}
+
+// NewPath is a wrapper around cairo_new_path().
+func (v *Context) NewPath() {
+	C.cairo_new_path(v.native())
+}
+
+// GetCurrentPoint is a wrapper around cairo_get_current_point().
+func (v *Context) GetCurrentPoint() (x, y float64) {
+	C.cairo_get_current_point(v.native(), (*C.double)(&x), (*C.double)(&y))
+	return
+}
+
+// FillPreserve is a wrapper around cairo_fill_preserve().
+func (v *Context) FillPreserve() {
+	C.cairo_fill_preserve(v.native())
+}
+
+// FillExtents is a wrapper around cairo_fill_extents().
+func (v *Context) FillExtents() (x1, y1, x2, y2 float64) {
+	var cx1, cy1, cx2, cy2 C.double
+	C.cairo_fill_extents(v.native(), &cx1, &cy1, &cx2, &cy2)
+	return float64(cx1), float64(cy1), float64(cx2), float64(cy2)
+}
+
+// InFill is a wrapper around cairo_in_fill().
+func (v *Context) InFill(x, y float64) bool {
+	c := C.cairo_in_fill(v.native(), C.double(x), C.double(y))
+	return gobool(c)
+}
+
+// TODO(jrick) Mask (depends on Pattern)
+
+// MaskSurface is a wrapper around cairo_mask_surface().
+func (v *Context) MaskSurface(surface *Surface, surfaceX, surfaceY float64) {
+	C.cairo_mask_surface(v.native(), surface.native(), C.double(surfaceX),
+		C.double(surfaceY))
+}
+
+// Paint is a wrapper around cairo_paint().
+func (v *Context) Paint() {
+	C.cairo_paint(v.native())
+}
+
+// PaintWithAlpha is a wrapper around cairo_paint_with_alpha().
+func (v *Context) PaintWithAlpha(alpha float64) {
+	C.cairo_paint_with_alpha(v.native(), C.double(alpha))
+}
+
+// Stroke is a wrapper around cairo_stroke().
+func (v *Context) Stroke() {
+	C.cairo_stroke(v.native())
+}
+
+// StrokePreserve is a wrapper around cairo_stroke_preserve().
+func (v *Context) StrokePreserve() {
+	C.cairo_stroke_preserve(v.native())
+}
+
+// StrokeExtents is a wrapper around cairo_stroke_extents().
+func (v *Context) StrokeExtents() (x1, y1, x2, y2 float64) {
+	var cx1, cy1, cx2, cy2 C.double
+	C.cairo_stroke_extents(v.native(), &cx1, &cy1, &cx2, &cy2)
+	return float64(cx1), float64(cy1), float64(cx2), float64(cy2)
+}
+
+// InStroke is a wrapper around cairo_in_stroke().
+func (v *Context) InStroke(x, y float64) bool {
+	c := C.cairo_in_stroke(v.native(), C.double(x), C.double(y))
+	return gobool(c)
+}
+
+// CopyPage is a wrapper around cairo_copy_page().
+func (v *Context) CopyPage() {
+	C.cairo_copy_page(v.native())
+}
+
+// ShowPage is a wrapper around cairo_show_page().
+func (v *Context) ShowPage() {
+	C.cairo_show_page(v.native())
+}