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package poppler
// #cgo pkg-config: poppler-glib
// #include <poppler.h>
// #include <glib.h>
// #include <cairo.h>
import "C"
import (
"unsafe"
"github.com/ungerik/go-cairo"
)
//import "fmt"
type Page struct {
p *C.struct__PopplerPage
openedAnnots []*Annot
}
func (p *Page) Text() string {
return C.GoString(C.poppler_page_get_text(p.p))
}
func (p *Page) TextAttributes() (results []TextAttributes) {
a := C.poppler_page_get_text_attributes(p.p)
defer C.poppler_page_free_text_attributes(a)
var attr *C.PopplerTextAttributes
results = make([]TextAttributes, 0)
el := C.g_list_first(a)
for el != nil {
attr = (*C.PopplerTextAttributes)(el.data)
fn := attr.font_name
result := TextAttributes{
FontName: toString(fn),
FontSize: float64(attr.font_size),
IsUnderlined: toBool(attr.is_underlined),
StartIndex: int(attr.start_index),
EndIndex: int(attr.end_index),
Color: Color{
R: int(attr.color.red),
G: int(attr.color.green),
B: int(attr.color.blue),
},
}
results = append(results, result)
el = el.next
}
return
}
func (p *Page) Size() (width, height float64) {
var w, h C.double
C.poppler_page_get_size(p.p, &w, &h)
return float64(w), float64(h)
}
func (p *Page) Index() int {
return int(C.poppler_page_get_index(p.p))
}
func (p *Page) Label() string {
return toString(C.poppler_page_get_label(p.p))
}
func (p *Page) Duration() float64 {
return float64(C.poppler_page_get_duration(p.p))
}
func (p *Page) Images() (results []Image) {
l := C.poppler_page_get_image_mapping(p.p)
defer C.poppler_page_free_image_mapping(l)
results = make([]Image, 0)
var im *C.PopplerImageMapping
for el := C.g_list_first(l); el != nil; el = el.next {
im = (*C.PopplerImageMapping)(el.data)
result := Image{
Id: int(im.image_id),
Area: Rectangle{
X1: float64(im.area.x1),
Y1: float64(im.area.y1),
X2: float64(im.area.x2),
Y2: float64(im.area.y2),
},
p: p.p,
}
results = append(results, result)
}
return
}
func (p *Page) TextLayout() (layouts []Rectangle) {
var rect *C.PopplerRectangle
var n C.guint
if toBool(C.poppler_page_get_text_layout(p.p, &rect, &n)) {
defer C.g_free((C.gpointer)(rect))
layouts = make([]Rectangle, int(n))
r := (*[1 << 30]C.PopplerRectangle)(unsafe.Pointer(rect))[:n:n]
for i := 0; i < int(n); i++ {
layouts[i] = Rectangle{
X1: float64(r[i].x1),
Y1: float64(r[i].y1),
X2: float64(r[i].x2),
Y2: float64(r[i].y2),
}
}
}
return
}
func (p *Page) TextLayoutAndAttrs() (result []TextEl) {
text := p.Text()
attrs := p.TextAttributes()
layout := p.TextLayout()
result = make([]TextEl, len(layout))
attrsRef := make([]*TextAttributes, len(attrs))
for i, a := range attrs {
attr := a
attrsRef[i] = &attr
}
i := 0
for _, t := range text {
var a *TextAttributes
for _, a = range attrsRef {
if i >= a.StartIndex && i <= a.EndIndex {
break
}
}
result[i] = TextEl{
Text: string(t),
Attrs: a,
Rect: layout[i],
}
i++
}
return
}
func (p *Page) Close() {
p.closeAnnotMappings()
if p.p != nil {
C.g_object_unref(C.gpointer(p.p))
/* avoid double free */
p.p = nil
}
}
// Converts a page into SVG and saves to file.
// Inspired by https://github.com/dawbarton/pdf2svg
func (p *Page) ConvertToSVG(filename string) {
width, height := p.Size()
// Open the SVG file
surface := cairo.NewSVGSurface(filename, width, height, cairo.SVG_VERSION_1_2)
// TODO Can be improved by using cairo_svg_surface_create_for_stream() instead of
// cairo_svg_surface_create() for stream processing instead of file processing.
// However, this needs to be changed in github.com/ungerik/go-cairo/surface.go
// Get cairo context pointer
_, drawcontext := surface.Native()
// Render the PDF file into the SVG file
C.poppler_page_render_for_printing(p.p, (*C.cairo_t)(unsafe.Pointer(drawcontext)))
// Close the SVG file
surface.ShowPage()
surface.Destroy()
}
func (p *Page) closeAnnotMappings() {
for i := 0; i < len(p.openedAnnots); i++ {
p.openedAnnots[i].Close()
}
p.openedAnnots = nil
}
func (p *Page) GetAnnots() (Annots []*Annot) {
var annots []*Annot
annotGlist := C.poppler_page_get_annot_mapping(p.p)
defer C.g_list_free(annotGlist)
p.closeAnnotMappings()
for annotGlist != nil {
popplerAnnot := (*C.PopplerAnnotMapping)(annotGlist.data)
annot := &Annot{
am: popplerAnnot,
}
/* Maybe we can used openedAnnots instead of annots + openedAnnots
*/
annots = append(annots, annot)
p.openedAnnots = append(p.openedAnnots, annot)
annotGlist = annotGlist.next
}
return annots
}
func (p *Page) AnnotText(a Annot) string {
cText := C.poppler_page_get_text_for_area(p.p, &a.am.area)
return C.GoString(cText)
}
func (p *Page) AddAnnot(a Annot) {
C.poppler_page_add_annot(p.p, a.am.annot)
}
func (p *Page) RemoveAnnot(a Annot) {
C.poppler_page_remove_annot(p.p, a.am.annot)
}
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