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Pad inline thumbnails without stretching

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This commit is contained in:
corrado.mulas
2026-10-04 10:50:16 +02:00
parent d5b6ab0c24
commit dd4b591f42
3 changed files with 66 additions and 9 deletions
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29
internal/render/render_test.go
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@@ -4,6 +4,8 @@ import (
"bytes"
"context"
"image"
"image/color"
"image/draw"
_ "image/png"
"os/exec"
"strings"
@@ -121,8 +123,8 @@ func TestRenderIntegration(t *testing.T) {
if err != nil {
t.Fatalf("decode thumbnail size: %v", err)
}
if thumbWidth > inlineThumbnailSide || thumbHeight > inlineThumbnailSide {
t.Errorf("thumbnail is %dx%d, want each side <= %d", thumbWidth, thumbHeight, inlineThumbnailSide)
if thumbWidth != inlineThumbnailSide || thumbHeight != inlineThumbnailSide {
t.Errorf("thumbnail is %dx%d, want a %dx%d padded square", thumbWidth, thumbHeight, inlineThumbnailSide, inlineThumbnailSide)
}
linked, err := r.Render(ctx, "", `\hypertarget{details}{Details}\par\hyperlink{details}{Go to details}`, 150)
@@ -134,6 +136,29 @@ func TestRenderIntegration(t *testing.T) {
}
}
func TestSquareThumbnailPadsWithoutStretching(t *testing.T) {
source := image.NewRGBA(image.Rect(0, 0, 160, 80))
draw.Draw(source, source.Bounds(), image.NewUniform(color.Black), image.Point{}, draw.Src)
thumbnail := squareThumbnail(source)
if thumbnail.Bounds() != image.Rect(0, 0, inlineThumbnailSide, inlineThumbnailSide) {
t.Fatalf("thumbnail bounds = %v", thumbnail.Bounds())
}
for _, sample := range []struct {
point image.Point
want color.RGBA
}{
{image.Pt(160, 119), color.RGBA{255, 255, 255, 255}},
{image.Pt(160, 120), color.RGBA{0, 0, 0, 255}},
{image.Pt(79, 160), color.RGBA{255, 255, 255, 255}},
{image.Pt(80, 160), color.RGBA{0, 0, 0, 255}},
} {
if got := thumbnail.RGBAAt(sample.point.X, sample.point.Y); got != sample.want {
t.Errorf("pixel at %v = %v, want %v", sample.point, got, sample.want)
}
}
}
func pngSizeBytes(data []byte) (int, int, error) {
return imageSizeBytes(data)
}