示例#1
0
文件: model.go 项目: h12w/gr
func renderPage(ctx *fz.Context, doc *fz.Document, pageIndex int, opt *RenderOption, buf []Pixel) {
	page := doc.LoadPage(pageIndex)
	defer doc.FreePage(page)

	var bounds fz.Rect
	doc.BoundPage(page, &bounds)
	zoom := float32(opt.Width) / bounds.X1
	var transform fz.Matrix
	transform.Scale(zoom, zoom)
	bounds.Transform(&transform)
	var bbox fz.Irect
	bbox.RoundRect(&bounds)

	pix := ctx.NewPixmapWithBboxAndData(ctx.DeviceRgb(), &bbox,
		(*byte)(unsafe.Pointer(&buf[0])))
	ctx.ClearPixmapWithValue(pix, 0xFF)

	dev := fz.NewDeviceHook(ctx.NewDrawDevice(pix))
	defer dev.Free()

	var imgRects Rects
	dev.ImageHook = func(image *fz.Image, ctm *fz.Matrix, alpha float32) {
		pt := fz.Point{0, 0}
		pt.Transform(ctm)
		x, y := int(pt.X), int(pt.Y)
		w := round(sqrtf(ctm.A*ctm.A+ctm.B*ctm.B) + 1)
		h := round(sqrtf(ctm.C*ctm.C+ctm.D*ctm.D) + 1)
		imgRects = append(imgRects, &Rect{x, y, w, h})
	}

	doc.RunPage(page, dev.ToDevice(), &transform, nil)

	if opt.Dark {
		pixels := buf
		off := 0
		b := opt.Brightness
		bb := b * b

		for y := 0; y < int(pix.H); y++ {
			for x := 0; x < int(pix.W); x++ {
				pixel := pixels[off+x]
				rgb := color.RGBFromBytes(pixel.GetRGB())
				if !imgRects.In(x, y) {
					hcl := rgb.ToHCL()
					hcl.L = 1 - hcl.L
					rgb = hcl.ToRGB()
					rgb.Times(b)
				} else {
					rgb.Times(bb)
				}
				pixels[off+x].SetRGB(rgb.ToBytes())
			}
			off += int(pix.W)
		}
	}
}
示例#2
0
文件: model.go 项目: h12w/gr
func (m *Model) setWidth(width int) {
	if width != m.Width {
		m.Width = width

		m.heights = make([]int, m.PageCount())
		m.height = 0
		for i := 0; i < m.PageCount(); i++ {
			page := m.doc.LoadPage(i)
			var bounds fz.Rect
			m.doc.BoundPage(page, &bounds)
			zoom := float32(width) / bounds.X1
			var transform fz.Matrix
			transform.Scale(zoom, zoom)
			bounds.Transform(&transform)
			var bbox fz.Irect
			bbox.RoundRect(&bounds)
			m.height += int(bbox.Y1)
			m.heights[i] = int(bbox.Y1)
			m.doc.FreePage(page)
		}
		m.cache = make([]Pixel, m.Width*m.height)
		m.cached = make([]bool, m.PageCount())
	}
}