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remove pointer from epub filters

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This commit is contained in:
Celogeek 2024-05-11 14:26:04 +02:00
parent 5404390fd8
commit a94e67dd06
Signed by: celogeek
SSH Key Fingerprint: SHA256:njNJLzoLQdbV9PC6ehcruRb0QnEgxABoCYZ+0+aUIYc
4 changed files with 15 additions and 15 deletions
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12
internal/epub/imagefilters/epub_image_filters_autocontrast.go
View File

@ -10,14 +10,14 @@ import (
// AutoContrast Automatically improve contrast
func AutoContrast() gift.Filter {
return &autocontrast{}
return autocontrast{}
}
type autocontrast struct {
}
// compute the color number between 0 and 1 that hold half of the pixel
func (f *autocontrast) mean(src image.Image) float32 {
func (f autocontrast) mean(src image.Image) float32 {
bucket := map[int]int{}
for x := src.Bounds().Min.X; x < src.Bounds().Max.X; x++ {
for y := src.Bounds().Min.Y; y < src.Bounds().Max.Y; y++ {
@ -44,7 +44,7 @@ func (f *autocontrast) mean(src image.Image) float32 {
}
// ensure value stay into 0 to 1 bound
func (f *autocontrast) cap(v float32) float32 {
func (f autocontrast) cap(v float32) float32 {
if v < 0 {
return 0
}
@ -55,12 +55,12 @@ func (f *autocontrast) cap(v float32) float32 {
}
// power of 2 for float32
func (f *autocontrast) pow2(v float32) float32 {
func (f autocontrast) pow2(v float32) float32 {
return v * v
}
// Draw into the dst after applying the filter
func (f *autocontrast) Draw(dst draw.Image, src image.Image, options *gift.Options) {
func (f autocontrast) Draw(dst draw.Image, src image.Image, options *gift.Options) {
// half of the pixel has this color idx
colorMean := f.mean(src)
@ -84,7 +84,7 @@ func (f *autocontrast) Draw(dst draw.Image, src image.Image, options *gift.Optio
}
// Bounds calculates the appropriate bounds of an image after applying the filter.
func (*autocontrast) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
func (autocontrast) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
dstBounds = srcBounds
return
}

6
internal/epub/imagefilters/epub_image_filters_cover_title.go
View File

@ -13,7 +13,7 @@ import (
// CoverTitle Create a title with the cover image
func CoverTitle(title string, align string, pctWidth int, pctMargin int, maxFontSize int, borderSize int) gift.Filter {
return &coverTitle{title, align, pctWidth, pctMargin, maxFontSize, borderSize}
return coverTitle{title, align, pctWidth, pctMargin, maxFontSize, borderSize}
}
type coverTitle struct {
@ -26,12 +26,12 @@ type coverTitle struct {
}
// Bounds size is the same as source
func (p *coverTitle) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
func (p coverTitle) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
return srcBounds
}
// Draw blur the src image, and create a box with the title in the middle
func (p *coverTitle) Draw(dst draw.Image, src image.Image, _ *gift.Options) {
func (p coverTitle) Draw(dst draw.Image, src image.Image, _ *gift.Options) {
draw.Draw(dst, dst.Bounds(), src, src.Bounds().Min, draw.Src)
if p.title == "" {
return

6
internal/epub/imagefilters/epub_image_filters_crop_split_double_page.go
View File

@ -11,14 +11,14 @@ import (
//
// This will cut in the middle of the page.
func CropSplitDoublePage(right bool) gift.Filter {
return &cropSplitDoublePage{right}
return cropSplitDoublePage{right}
}
type cropSplitDoublePage struct {
right bool
}
func (p *cropSplitDoublePage) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
func (p cropSplitDoublePage) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
if p.right {
dstBounds = image.Rect(
srcBounds.Max.X/2, srcBounds.Min.Y,
@ -33,6 +33,6 @@ func (p *cropSplitDoublePage) Bounds(srcBounds image.Rectangle) (dstBounds image
return
}
func (p *cropSplitDoublePage) Draw(dst draw.Image, src image.Image, options *gift.Options) {
func (p cropSplitDoublePage) Draw(dst draw.Image, src image.Image, options *gift.Options) {
gift.Crop(dst.Bounds()).Draw(dst, src, options)
}

6
internal/epub/imagefilters/epub_image_filters_pixel.go
View File

@ -12,13 +12,13 @@ import (
//
// An image 0x0 is not a valid image, and failed to read.
func Pixel() gift.Filter {
return &pixel{}
return pixel{}
}
type pixel struct {
}
func (p *pixel) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
func (p pixel) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
if srcBounds.Dx() == 0 || srcBounds.Dy() == 0 {
dstBounds = image.Rect(0, 0, 1, 1)
} else {
@ -27,7 +27,7 @@ func (p *pixel) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
return
}
func (p *pixel) Draw(dst draw.Image, src image.Image, _ *gift.Options) {
func (p pixel) Draw(dst draw.Image, src image.Image, _ *gift.Options) {
if dst.Bounds().Dx() == 1 && dst.Bounds().Dy() == 1 {
dst.Set(0, 0, color.White)
return