bolknote/go-gd

Go bingings for GD (http://www.boutell.com/gd/)

go-gd's Issues

can not build on msys2

pacman -Q | grep libgd
mingw-w64-i686-libgd 2.2.5-1

# github.com/bolknote/go-gd
..\.gopath\src\github.com\bolknote\go-gd\gd.go:655:16: type [1073741824]_Ctype_struct___1 larger than address space
..\.gopath\src\github.com\bolknote\go-gd\gd.go:655:16: type [1073741824]_Ctype_struct___1 too large
..\.gopath\src\github.com\bolknote\go-gd\gd.go:667:188: cannot use gdpoints (type _Ctype_gdPointPtr) as type *_Ctype_struct___3 in argument to func literal
..\.gopath\src\github.com\bolknote\go-gd\gd.go:674:192: cannot use gdpoints (type _Ctype_gdPointPtr) as type *_Ctype_struct___3 in argument to func literal
..\.gopath\src\github.com\bolknote\go-gd\gd.go:681:194: cannot use gdpoints (type _Ctype_gdPointPtr) as type *_Ctype_struct___3 in argument to func literal

gg works but pictures generated is much larger than gd (8x).

Build error: cannot use quantization (type int) as type _Ctype_int in argument to func literal

go-gd/gd.go

Line 118 in 3320b6f

buf := C.gdImageWebpPtrEx(p.img, pimgSize, quantization)

And with buf := C.gdImageWebpPtrEx(p.img, pimgSize, C.int(quantization))
build OK

go version go1.10 darwin/amd64

StringFT is suboptimal

In current implementation (which I believe partially follows PHP extension) StringFT initialize and destroy font cache on every call, which is OK if this function is used infrequently. But if StringFT is heavily used, then init/deinit of cache on every call is a waste. Moreover, cache is global in libgd, so init/deint of the cache in StringFT makes StringFT thread-unsafe.

I think, it would be handy to have option to control font cache manually, and provide another interface to the gdImageStringFT, which works with pre-initialized cache.

As a simpler option, according to the libgd docs, gdFontCacheSetup/gdFontCacheShutdown can be just omitted from StringFT, as gdImageStringFT will setup font cache if it is not yet initialized.

Using Polygon Functions

Greetings,

I am attempting to use the Polygon functions with the following code:

var points = []struct {
        x int
        y int
}{
        {2, 2},
        {2500, 2500},
        {250, 4000},
        {20, 100},
}
pict.FilledPolygon(points, white)

With go 1.10, I receive the following error upon go run main.go:

./main.go:24:20: cannot use points (type []struct { x int; y int }) as type []struct { gd.x int; gd.y int } in argument to pict.FilledPolygon

What is the correct way to pass points to these functions? Thanks for any help you may be able to provide.

incompatible pointer types passing

I have error return as:

cgo-gcc-prolog:922:30: warning: incompatible pointer types passing 'struct (anonymous struct at cgo-gcc-prolog:917:3)

so when I remove:

func (p *Image) Polygon(points [](struct{ x, y int }), c Color) {
	C.gdImagePolygon(p.img, (C.gdPointPtr)(Pointer(&points)), C.int(len(points)), C.int(c))
}

func (p *Image) OpenPolygon(points [](struct{ x, y int }), c Color) {
	C.gdImageOpenPolygon(p.img, (C.gdPointPtr)(Pointer(&points)), C.int(len(points)), C.int(c))
}

func (p *Image) FilledPolygon(points [](struct{ x, y int }), c Color) {
	C.gdImageFilledPolygon(p.img, (C.gdPointPtr)(Pointer(&points)), C.int(len(points)), C.int(c))
}

go version:

go1.8 darwin/amd64

it's run ok. Can you fix it ?

can not build on win7 x64

# github.com/bolknote/go-gd
..\.gopath\src\github.com\bolknote\go-gd\gd.go:655:16: type [1073741824]_Ctype_struct___1 larger than address space
..\.gopath\src\github.com\bolknote\go-gd\gd.go:655:16: type [1073741824]_Ctype_struct___1 too large
..\.gopath\src\github.com\bolknote\go-gd\gd.go:667:188: cannot use gdpoints (type _Ctype_gdPointPtr) as type *_Ctype_struct___3 in argument to func literal
..\.gopath\src\github.com\bolknote\go-gd\gd.go:674:192: cannot use gdpoints (type _Ctype_gdPointPtr) as type *_Ctype_struct___3 in argument to func literal
..\.gopath\src\github.com\bolknote\go-gd\gd.go:681:194: cannot use gdpoints (type _Ctype_gdPointPtr) as type *_Ctype_struct___3 in argument to func literal

go version
go version go1.11 windows/386

run `go build` error

Hi,

I'm recently working on processing images with go and this gd lib.

But I found errors during running go build like following,

looks like the linker hasn't found the proper lib file.

but passing -ldflags "-lgd" won't work.

What should I do building this library?

thanks!

# _/tmp/go-gd
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdFontCacheSetup':
./gd.go:62: undefined reference to `gdFontCacheSetup'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdFontGetGiant':
./gd.go:80: undefined reference to `gdFontGetGiant'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdFontGetLarge':
./gd.go:89: undefined reference to `gdFontGetLarge'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdFontGetMediumBold':
./gd.go:98: undefined reference to `gdFontGetMediumBold'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdFontGetSmall':
./gd.go:107: undefined reference to `gdFontGetSmall'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdFontGetTiny':
./gd.go:116: undefined reference to `gdFontGetTiny'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageArc':
./gd.go:153: undefined reference to `gdImageArc'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorAllocate':
./gd.go:196: undefined reference to `gdImageColorAllocate'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorAllocateAlpha':
./gd.go:211: undefined reference to `gdImageColorAllocateAlpha'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorClosest':
./gd.go:226: undefined reference to `gdImageColorClosest'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorClosestAlpha':
./gd.go:241: undefined reference to `gdImageColorClosestAlpha'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorClosestHWB':
./gd.go:256: undefined reference to `gdImageColorClosestHWB'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorExact':
./gd.go:282: undefined reference to `gdImageColorExact'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorExactAlpha':
./gd.go:297: undefined reference to `gdImageColorExactAlpha'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorResolve':
./gd.go:312: undefined reference to `gdImageColorResolve'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorResolveAlpha':
./gd.go:327: undefined reference to `gdImageColorResolveAlpha'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCopy':
./gd.go:354: undefined reference to `gdImageCopy'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCopyMerge':
./gd.go:372: undefined reference to `gdImageCopyMerge'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCopyMergeGray':
./gd.go:390: undefined reference to `gdImageCopyMergeGray'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCopyResampled':
./gd.go:408: undefined reference to `gdImageCopyResampled'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCopyResized':
./gd.go:426: undefined reference to `gdImageCopyResized'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCopyRotated':
./gd.go:444: undefined reference to `gdImageCopyRotated'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCreate':
./gd.go:455: undefined reference to `gdImageCreate'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCreateFromGif':
./gd.go:465: undefined reference to `gdImageCreateFromGif'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCreateFromJpeg':
./gd.go:475: undefined reference to `gdImageCreateFromJpeg'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCreateFromPng':
./gd.go:485: undefined reference to `gdImageCreateFromPng'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCreateFromWBMP':
./gd.go:495: undefined reference to `gdImageCreateFromWBMP'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCreateFromXbm':
./gd.go:505: undefined reference to `gdImageCreateFromXbm'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCreateFromXpm':
./gd.go:515: undefined reference to `gdImageCreateFromXpm'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCreateTrueColor':
./gd.go:526: undefined reference to `gdImageCreateTrueColor'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageFilledArc':
./gd.go:593: undefined reference to `gdImageFilledArc'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageGetPixel':
./gd.go:648: undefined reference to `gdImageGetPixel'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSquareToCircle':
./gd.go:867: undefined reference to `gdImageSquareToCircle'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageStringFT':
./gd.go:901: undefined reference to `gdImageStringFT'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdFontCacheShutdown':
./gd.go:71: undefined reference to `gdFontCacheShutdown'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageAABlend':
./gd.go:125: undefined reference to `gdImageAABlend'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageAlphaBlending':
./gd.go:136: undefined reference to `gdImageAlphaBlending'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageChar':
./gd.go:167: undefined reference to `gdImageChar'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageCharUp':
./gd.go:181: undefined reference to `gdImageCharUp'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorDeallocate':
./gd.go:267: undefined reference to `gdImageColorDeallocate'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageColorTransparent':
./gd.go:338: undefined reference to `gdImageColorTransparent'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageDashedLine':
./gd.go:541: undefined reference to `gdImageDashedLine'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageDestroy':
./gd.go:550: undefined reference to `gdImageDestroy'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageFill':
./gd.go:563: undefined reference to `gdImageFill'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageFillToBorder':
./gd.go:576: undefined reference to `gdImageFillToBorder'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageFilledEllipse':
./gd.go:608: undefined reference to `gdImageFilledEllipse'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageFilledPolygon':
./gd.go:620: undefined reference to `gdImageFilledPolygon'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageFilledRectangle':
./gd.go:635: undefined reference to `gdImageFilledRectangle'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageGif':
./gd.go:658: undefined reference to `gdImageGif'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageInterlace':
./gd.go:669: undefined reference to `gdImageInterlace'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageJpeg':
./gd.go:681: undefined reference to `gdImageJpeg'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageLine':
./gd.go:696: undefined reference to `gdImageLine'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageOpenPolygon':
./gd.go:708: undefined reference to `gdImageOpenPolygon'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImagePaletteCopy':
./gd.go:718: undefined reference to `gdImagePaletteCopy'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImagePng':
./gd.go:728: undefined reference to `gdImagePng'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImagePolygon':
./gd.go:740: undefined reference to `gdImagePolygon'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageRectangle':
./gd.go:755: undefined reference to `gdImageRectangle'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSaveAlpha':
./gd.go:766: undefined reference to `gdImageSaveAlpha'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSetAntiAliased':
./gd.go:777: undefined reference to `gdImageSetAntiAliased'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSetAntiAliasedDontBlend':
./gd.go:788: undefined reference to `gdImageSetAntiAliasedDontBlend'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSetBrush':
./gd.go:798: undefined reference to `gdImageSetBrush'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSetPixel':
./gd.go:811: undefined reference to `gdImageSetPixel'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSetStyle':
./gd.go:823: undefined reference to `gdImageSetStyle'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSetThickness':
./gd.go:834: undefined reference to `gdImageSetThickness'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSetTile':
./gd.go:844: undefined reference to `gdImageSetTile'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageSharpen':
./gd.go:855: undefined reference to `gdImageSharpen'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageString':
./gd.go:882: undefined reference to `gdImageString'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageStringUp':
./gd.go:916: undefined reference to `gdImageStringUp'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageTrueColorToPalette':
./gd.go:927: undefined reference to `gdImageTrueColorToPalette'
/tmp/go-build529644233/_/tmp/go-gd/_obj/gd.cgo2.o: In function `_cgo_a69468c695dd_Cfunc_gdImageWBMP':
./gd.go:939: undefined reference to `gdImageWBMP'
collect2: ld returned 1 exit status