wehub-resource-sync
76 lines
2.3 KiB
Go
76 lines
2.3 KiB
Go
package control
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import (
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"bytes"
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"image"
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"image/color"
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"image/jpeg"
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"image/png"
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"testing"
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)
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func makeTestPNG(t *testing.T, w, h int) []byte {
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t.Helper()
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img := image.NewRGBA(image.Rect(0, 0, w, h))
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for y := 0; y < h; y++ {
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for x := 0; x < w; x++ {
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img.Set(x, y, color.RGBA{R: uint8(x), G: uint8(y), B: uint8(x ^ y), A: 255})
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}
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}
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var buf bytes.Buffer
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if err := png.Encode(&buf, img); err != nil {
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t.Fatalf("encode png: %v", err)
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}
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return buf.Bytes()
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}
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func TestCompressForVisionDownscalesOversizedPNG(t *testing.T) {
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raw := makeTestPNG(t, 3000, 1500)
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out, mime := compressForVision(raw, "image/png")
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if mime != "image/png" {
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t.Errorf("mime = %q, want image/png", mime)
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}
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cfg, _, err := image.DecodeConfig(bytes.NewReader(out))
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if err != nil {
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t.Fatalf("decode out: %v", err)
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}
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// Pixel count is what governs vision token cost; assert the reduction there
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// (byte size isn't a robust invariant for synthetic, highly-compressible input).
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if cfg.Width != maxVisionDim || cfg.Height != 1500*maxVisionDim/3000 {
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t.Errorf("dims = %dx%d, want %dx%d", cfg.Width, cfg.Height, maxVisionDim, 1500*maxVisionDim/3000)
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}
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if cfg.Width*cfg.Height >= 3000*1500 {
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t.Errorf("pixel count %d not reduced from %d", cfg.Width*cfg.Height, 3000*1500)
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}
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}
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func TestCompressForVisionKeepsSmallImageVerbatim(t *testing.T) {
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raw := makeTestPNG(t, 100, 80)
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out, mime := compressForVision(raw, "image/png")
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if mime != "image/png" || !bytes.Equal(out, raw) {
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t.Errorf("an in-budget image must pass through unchanged (got %d bytes, mime %q)", len(out), mime)
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}
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}
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func TestCompressForVisionJPEGStaysJPEG(t *testing.T) {
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var buf bytes.Buffer
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if err := jpeg.Encode(&buf, image.NewRGBA(image.Rect(0, 0, 2400, 1200)), nil); err != nil {
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t.Fatal(err)
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}
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out, mime := compressForVision(buf.Bytes(), "image/jpeg")
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if mime != "image/jpeg" {
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t.Fatalf("mime = %q, want image/jpeg", mime)
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}
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if cfg, _, _ := image.DecodeConfig(bytes.NewReader(out)); cfg.Width != maxVisionDim {
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t.Errorf("width = %d, want %d", cfg.Width, maxVisionDim)
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}
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}
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func TestCompressForVisionPassesThroughUndecodable(t *testing.T) {
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raw := []byte("<svg xmlns='...'></svg>")
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out, mime := compressForVision(raw, "image/svg+xml")
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if mime != "image/svg+xml" || !bytes.Equal(out, raw) {
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t.Error("an undecodable mime must pass through unchanged")
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}
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}
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