mirror of
https://github.com/unidoc/unipdf.git
synced 2025-05-02 22:17:06 +08:00
d961079c5d
* Add render package * Add text state * Add more text operators * Remove unnecessary files * Add text font * Add custom text render method * Improve text rendering method * Rename text state methods * Refactor and document context interface * Refact text begin/end operators * Fix graphics state transformations * Keep original font when doing font substitution * Take page cropbox into account * Revert to substitution font if original font measurement is 0 * Add font substitution package * Implement addition transform.Point methods * Use transform.Point in the image context package * Remove unneeded functionality from the render image package * Fix golint notices in the image rendering package * Fix go vet notices in the render package * Fix golint notices in the top-level render package * Improve render context package documentation * Document context text state struct. * Document context text font struct. * Minor logging improvements * Add license disclaimer to the render package files * Avoid using package aliases where possible * Change style of section comments * Adapt render package import style to follow the developer guide * Improve documentation for the internal matrix implementation * Update render package dependency versions * Apply crop box post render * Account for offseted media boxes * Improve metrics of rendered characters * Fix text matrix translation * Change priority of fonts used for measuring rendered characters * Skip invalid m and l operators on image rendering * Small fix for v operator * Fix rendered characters spacing issues * Refactor naming of internal render packages
74 lines
1.3 KiB
Go
74 lines
1.3 KiB
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package imagerender
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import (
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"fmt"
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"image"
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"image/draw"
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"math"
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"strings"
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"golang.org/x/image/math/fixed"
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"github.com/unidoc/unipdf/v3/internal/transform"
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)
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func degreesToRadians(degrees float64) float64 {
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return degrees * math.Pi / 180
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}
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func imageToRGBA(src image.Image) *image.RGBA {
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bounds := src.Bounds()
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dst := image.NewRGBA(bounds)
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draw.Draw(dst, bounds, src, bounds.Min, draw.Src)
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return dst
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}
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func parseHexColor(x string) (r, g, b, a int) {
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x = strings.TrimPrefix(x, "#")
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a = 255
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if len(x) == 3 {
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format := "%1x%1x%1x"
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fmt.Sscanf(x, format, &r, &g, &b)
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r |= r << 4
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g |= g << 4
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b |= b << 4
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}
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if len(x) == 6 {
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format := "%02x%02x%02x"
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fmt.Sscanf(x, format, &r, &g, &b)
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}
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if len(x) == 8 {
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format := "%02x%02x%02x%02x"
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fmt.Sscanf(x, format, &r, &g, &b, &a)
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}
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return
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}
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func fixedPoint(p transform.Point) fixed.Point26_6 {
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return fixed.Point26_6{
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X: fix(p.X),
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Y: fix(p.Y),
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}
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}
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func fix(x float64) fixed.Int26_6 {
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return fixed.Int26_6(x * 64)
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}
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func unfix(x fixed.Int26_6) float64 {
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const shift, mask = 6, 1<<6 - 1
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if x >= 0 {
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return float64(x>>shift) + float64(x&mask)/64
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}
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x = -x
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if x >= 0 {
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return -(float64(x>>shift) + float64(x&mask)/64)
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}
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return 0
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}
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