feat: Improve image transparency handling and background processing

- Add detection of image transparency across different image formats
- Implement white background rendering for images with transparency
- Support converting transparent images to JPEG/PNG with white background
- Enhance image metadata extraction with transparency checks
- Add logging for transparency processing and image conversion

src/go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/stretchr/testify v1.10.0
 	github.com/valyala/fasthttp v1.59.0
 	go.mau.fi/libsignal v0.1.2
-	go.mau.fi/whatsmeow v0.0.0-20250225112721-b7530f3a5056
+	go.mau.fi/whatsmeow v0.0.0-20250305175604-af3dc0346412
 	google.golang.org/protobuf v1.36.5
 )
 
@@ -58,12 +58,12 @@ require (
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	go.mau.fi/util v0.8.5 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/crypto v0.35.0 // indirect
-	golang.org/x/exp v0.0.0-20250218142911-aa4b98e5adaa // indirect
-	golang.org/x/image v0.24.0 // indirect
-	golang.org/x/net v0.35.0 // indirect
-	golang.org/x/sys v0.30.0 // indirect
-	golang.org/x/text v0.22.0 // indirect
+	golang.org/x/crypto v0.36.0 // indirect
+	golang.org/x/exp v0.0.0-20250305212735-054e65f0b394 // indirect
+	golang.org/x/image v0.25.0 // indirect
+	golang.org/x/net v0.37.0 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+	golang.org/x/text v0.23.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

src/go.sum

@@ -128,6 +128,8 @@ go.mau.fi/util v0.8.5 h1:PwCAAtcfK0XxZ4sdErJyfBMkTEWoQU33aB7QqDDzQRI=
 go.mau.fi/util v0.8.5/go.mod h1:Ycug9mrbztlahHPEJ6H5r8Nu/xqZaWbE5vPHVWmfz6M=
 go.mau.fi/whatsmeow v0.0.0-20250225112721-b7530f3a5056 h1:1JQUOpYXhFSEQgXMEWD/ZH38FrIe5i1yjxSBwa0aN/Q=
 go.mau.fi/whatsmeow v0.0.0-20250225112721-b7530f3a5056/go.mod h1:6hRrUtDWI2wTRClOd6m17GwrFE2a8/p5R4pjJsIVn+U=
+go.mau.fi/whatsmeow v0.0.0-20250305175604-af3dc0346412 h1:AM+t3vKEho3zTDOW2g6KvxB7iGNPwp0SFZpmx4slVVU=
+go.mau.fi/whatsmeow v0.0.0-20250305175604-af3dc0346412/go.mod h1:6hRrUtDWI2wTRClOd6m17GwrFE2a8/p5R4pjJsIVn+U=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
@@ -138,11 +140,19 @@ golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v
 golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
 golang.org/x/crypto v0.35.0 h1:b15kiHdrGCHrP6LvwaQ3c03kgNhhiMgvlhxHQhmg2Xs=
 golang.org/x/crypto v0.35.0/go.mod h1:dy7dXNW32cAb/6/PRuTNsix8T+vJAqvuIy5Bli/x0YQ=
+golang.org/x/crypto v0.36.0 h1:AnAEvhDddvBdpY+uR+MyHmuZzzNqXSe/GvuDeob5L34=
+golang.org/x/crypto v0.36.0/go.mod h1:Y4J0ReaxCR1IMaabaSMugxJES1EpwhBHhv2bDHklZvc=
 golang.org/x/exp v0.0.0-20250218142911-aa4b98e5adaa h1:t2QcU6V556bFjYgu4L6C+6VrCPyJZ+eyRsABUPs1mz4=
 golang.org/x/exp v0.0.0-20250218142911-aa4b98e5adaa/go.mod h1:BHOTPb3L19zxehTsLoJXVaTktb06DFgmdW6Wb9s8jqk=
+golang.org/x/exp v0.0.0-20250228200357-dead58393ab7 h1:aWwlzYV971S4BXRS9AmqwDLAD85ouC6X+pocatKY58c=
+golang.org/x/exp v0.0.0-20250228200357-dead58393ab7/go.mod h1:BHOTPb3L19zxehTsLoJXVaTktb06DFgmdW6Wb9s8jqk=
+golang.org/x/exp v0.0.0-20250305212735-054e65f0b394 h1:nDVHiLt8aIbd/VzvPWN6kSOPE7+F/fNFDSXLVYkE/Iw=
+golang.org/x/exp v0.0.0-20250305212735-054e65f0b394/go.mod h1:sIifuuw/Yco/y6yb6+bDNfyeQ/MdPUy/hKEMYQV17cM=
 golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/image v0.24.0 h1:AN7zRgVsbvmTfNyqIbbOraYL8mSwcKncEj8ofjgzcMQ=
 golang.org/x/image v0.24.0/go.mod h1:4b/ITuLfqYq1hqZcjofwctIhi7sZh2WaCjvsBNjjya8=
+golang.org/x/image v0.25.0 h1:Y6uW6rH1y5y/LK1J8BPWZtr6yZ7hrsy6hFrXjgsc2fQ=
+golang.org/x/image v0.25.0/go.mod h1:tCAmOEGthTtkalusGp1g3xa2gke8J6c2N565dTyl9Rs=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
@@ -159,6 +169,10 @@ golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
 golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
 golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
 golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
+golang.org/x/net v0.36.0 h1:vWF2fRbw4qslQsQzgFqZff+BItCvGFQqKzKIzx1rmoA=
+golang.org/x/net v0.36.0/go.mod h1:bFmbeoIPfrw4sMHNhb4J9f6+tPziuGjq7Jk/38fxi1I=
+golang.org/x/net v0.37.0 h1:1zLorHbz+LYj7MQlSf1+2tPIIgibq2eL5xkrGk6f+2c=
+golang.org/x/net v0.37.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -182,6 +196,8 @@ golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
 golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
+golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 golang.org/x/telemetry v0.0.0-20240228155512-f48c80bd79b2/go.mod h1:TeRTkGYfJXctD9OcfyVLyj2J3IxLnKwHJR8f4D8a3YE=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
@@ -202,6 +218,8 @@ golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
 golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
 golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
+golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
+golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=

src/pkg/utils/general.go

@@ -4,9 +4,11 @@ import (
 	"bytes"
 	"fmt"
 	"image"
-	_ "image/gif"  // Register GIF format
-	_ "image/jpeg" // Register JPEG format
-	_ "image/png"  // Register PNG format
+	"image/color"
+	"image/draw"
+	_ "image/gif" // Register GIF format
+	"image/jpeg"  // For JPEG encoding
+	"image/png"   // For PNG encoding
 	"io"
 	"log"
 	"net/http"
@@ -122,14 +124,100 @@ func GetMetaDataFromURL(url string) (meta Metadata, err error) {
 
 				// Get image dimensions from the actual image rather than OG tags
 				imageReader := bytes.NewReader(imageData)
-				img, _, err := image.Decode(imageReader)
+				img, imgFormat, err := image.Decode(imageReader)
 				if err == nil {
 					bounds := img.Bounds()
 					width := uint32(bounds.Max.X - bounds.Min.X)
 					height := uint32(bounds.Max.Y - bounds.Min.Y)
 
+					// Check if image has transparency (alpha channel)
+					hasTransparency := false
+
+					// Check for transparency by examining image type and pixels
+					switch v := img.(type) {
+					case *image.NRGBA:
+						// NRGBA format - check alpha values
+						for y := bounds.Min.Y; y < bounds.Max.Y && !hasTransparency; y++ {
+							for x := bounds.Min.X; x < bounds.Max.X; x++ {
+								_, _, _, a := v.At(x, y).RGBA()
+								if a < 0xffff {
+									hasTransparency = true
+									break
+								}
+							}
+						}
+					case *image.RGBA:
+						// RGBA format - check alpha values
+						for y := bounds.Min.Y; y < bounds.Max.Y && !hasTransparency; y++ {
+							for x := bounds.Min.X; x < bounds.Max.X; x++ {
+								_, _, _, a := v.At(x, y).RGBA()
+								if a < 0xffff {
+									hasTransparency = true
+									break
+								}
+							}
+						}
+					case *image.NRGBA64:
+						// NRGBA64 format - check alpha values
+						for y := bounds.Min.Y; y < bounds.Max.Y && !hasTransparency; y++ {
+							for x := bounds.Min.X; x < bounds.Max.X; x++ {
+								_, _, _, a := v.At(x, y).RGBA()
+								if a < 0xffff {
+									hasTransparency = true
+									break
+								}
+							}
+						}
+					default:
+						// For other formats, check if the format typically supports transparency
+						hasTransparency = imgFormat == "png" || imgFormat == "gif"
+					}
+
+					// If image has transparency, create a new image with white background
+					if hasTransparency {
+						log.Printf("Image has transparency, setting white background")
+
+						// Create a new RGBA image with white background
+						newImg := image.NewRGBA(bounds)
+						draw.Draw(newImg, bounds, image.NewUniform(color.White), image.Point{}, draw.Src)
+
+						// Draw the original image on top of the white background
+						draw.Draw(newImg, bounds, img, bounds.Min, draw.Over)
+
+						// Convert the new image back to bytes
+						var buf bytes.Buffer
+						switch imgFormat {
+						case "png":
+							if err := png.Encode(&buf, newImg); err == nil {
+								meta.ImageThumb = buf.Bytes()
+							} else {
+								log.Printf("Failed to encode PNG image: %v", err)
+							}
+						case "jpeg", "jpg":
+							if err := jpeg.Encode(&buf, newImg, nil); err == nil {
+								meta.ImageThumb = buf.Bytes()
+							} else {
+								log.Printf("Failed to encode JPEG image: %v", err)
+							}
+						case "gif":
+							// Note: Simple conversion to PNG for GIF with transparency
+							if err := png.Encode(&buf, newImg); err == nil {
+								meta.ImageThumb = buf.Bytes()
+							} else {
+								log.Printf("Failed to encode GIF as PNG: %v", err)
+							}
+						default:
+							// For other formats, try PNG
+							if err := png.Encode(&buf, newImg); err == nil {
+								meta.ImageThumb = buf.Bytes()
+							} else {
+								log.Printf("Failed to encode image as PNG: %v", err)
+							}
+						}
+					}
+
 					// Check if image is square (1:1 ratio)
-					if width == height {
+					if width == height && width <= 200 {
 						// For 1:1 ratio, leave width and height as nil
 						meta.Width = nil
 						meta.Height = nil