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feat(types): infer types in runtime

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This commit is contained in:
Tomas Aparicio 2016-09-27 23:56:18 +01:00
parent de76daee9c
commit bffc7652bb
3 changed files with 102 additions and 100 deletions
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75
vips.go
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@ -30,38 +30,6 @@ const VipsMajorVersion = int(C.VIPS_MAJOR_VERSION)
// VipsMinorVersion exposes the current libvips minor version number
const VipsMinorVersion = int(C.VIPS_MINOR_VERSION)
// HasJPEGSupport exposes if the current libvips compilation
// supports JPEG images.
const HasJPEGSupport = int(C.VIPS_JPEG_SUPPORT) == 1
// HasWEBPSupport exposes if the current libvips compilation
// supports WEBP images.
const HasWEBPSupport = int(C.VIPS_WEBP_SUPPORT) == 1
// HasPNGSupport exposes if the current libvips compilation
// supports PNG images.
const HasPNGSupport = int(C.VIPS_PNG_SUPPORT) == 1
// HasMagickSupport exposes if the current libvips compilation
// supports libmagick bindings.
const HasMagickSupport = int(C.VIPS_MAGICK_SUPPORT) == 1
// HasGIFSupport exposes if the current libvips compilation
// supports GIF images.
const HasGIFSupport = int(C.VIPS_GIF_SUPPORT) == 1
// HasSVGSupport exposes if the current libvips compilation
// supports SVG images.
const HasSVGSupport = int(C.VIPS_SVG_SUPPORT) == 1
// HasPDFSupport exposes if the current libvips compilation
// supports PDF images.
const HasPDFSupport = int(C.VIPS_PDF_SUPPORT) == 1
// HasTIFFSupport exposes if the current libvips compilation
// supports TIFF images.
const HasTIFFSupport = int(C.VIPS_TIFF_SUPPORT) == 1
const (
maxCacheMem = 100 * 1024 * 1024
maxCacheSize = 500
@ -169,6 +137,33 @@ func VipsMemory() VipsMemoryInfo {
}
}
// VipsIsTypeSupported returns true if the given image type
// is supported by the current libvips compilation.
func VipsIsTypeSupported(t ImageType) bool {
if t == JPEG {
return int(C.vips_type_find_bridge(C.JPEG)) != 0
}
if t == WEBP {
return int(C.vips_type_find_bridge(C.WEBP)) != 0
}
if t == PNG {
return int(C.vips_type_find_bridge(C.PNG)) != 0
}
if t == GIF {
return int(C.vips_type_find_bridge(C.GIF)) != 0
}
if t == PDF {
return int(C.vips_type_find_bridge(C.PDF)) != 0
}
if t == SVG {
return int(C.vips_type_find_bridge(C.SVG)) != 0
}
if t == TIFF {
return int(C.vips_type_find_bridge(C.TIFF)) != 0
}
return false
}
func vipsExifOrientation(image *C.VipsImage) int {
return int(C.vips_exif_orientation(image))
}
@ -493,30 +488,30 @@ func vipsImageType(buf []byte) ImageType {
if len(buf) == 0 {
return UNKNOWN
}
if buf[0] == 0x89 && buf[1] == 0x50 && buf[2] == 0x4E && buf[3] == 0x47 {
return PNG
}
if buf[0] == 0xFF && buf[1] == 0xD8 && buf[2] == 0xFF {
return JPEG
}
if buf[8] == 0x57 && buf[9] == 0x45 && buf[10] == 0x42 && buf[11] == 0x50 {
if IsImageTypeSupportedByVips(WEBP) && buf[8] == 0x57 && buf[9] == 0x45 && buf[10] == 0x42 && buf[11] == 0x50 {
return WEBP
}
if (buf[0] == 0x49 && buf[1] == 0x49 && buf[2] == 0x2A && buf[3] == 0x0) ||
(buf[0] == 0x4D && buf[1] == 0x4D && buf[2] == 0x0 && buf[3] == 0x2A) {
if IsImageTypeSupportedByVips(TIFF) &&
((buf[0] == 0x49 && buf[1] == 0x49 && buf[2] == 0x2A && buf[3] == 0x0) ||
(buf[0] == 0x4D && buf[1] == 0x4D && buf[2] == 0x0 && buf[3] == 0x2A)) {
return TIFF
}
if buf[0] == 0x47 && buf[1] == 0x49 && buf[2] == 0x46 {
if IsImageTypeSupportedByVips(GIF) && buf[0] == 0x47 && buf[1] == 0x49 && buf[2] == 0x46 {
return GIF
}
if buf[0] == 0x25 && buf[1] == 0x50 && buf[2] == 0x44 && buf[3] == 0x46 {
if IsImageTypeSupportedByVips(PDF) && buf[0] == 0x25 && buf[1] == 0x50 && buf[2] == 0x44 && buf[3] == 0x46 {
return PDF
}
if IsSVGImage(buf) {
if IsImageTypeSupportedByVips(SVG) && IsSVGImage(buf) {
return SVG
}
if HasMagickSupport && strings.HasSuffix(readImageType(buf), "MagickBuffer") {
if strings.HasSuffix(readImageType(buf), "MagickBuffer") {
return MAGICK
}
return UNKNOWN