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package image
import "core:mem"
import "core:bytes"
Loader_Proc :: #type proc(data: []byte, options: Options, allocator: mem.Allocator) -> (img: ^Image, err: Error)
Destroy_Proc :: #type proc(img: ^Image)
@(private)
_internal_loaders: [Which_File_Type]Loader_Proc
_internal_destroyers: [Which_File_Type]Destroy_Proc
register :: proc "contextless" (kind: Which_File_Type, loader: Loader_Proc, destroyer: Destroy_Proc) {
assert_contextless(loader != nil)
assert_contextless(destroyer != nil)
assert_contextless(_internal_loaders[kind] == nil)
_internal_loaders[kind] = loader
assert_contextless(_internal_destroyers[kind] == nil)
_internal_destroyers[kind] = destroyer
}
load_from_bytes :: proc(data: []byte, options := Options{}, allocator := context.allocator) -> (img: ^Image, err: Error) {
loader := _internal_loaders[which(data)]
if loader == nil {
// Check if there is at least one loader, otherwise panic to let the user know about misuse.
for a_loader in _internal_loaders {
if a_loader != nil {
return nil, .Unsupported_Format
}
}
panic("image.load called when no image loaders are registered. Register a loader by first importing a subpackage (eg: `import \"core:image/png\"`), or with image.register")
}
return loader(data, options, allocator)
}
destroy :: proc(img: ^Image, allocator := context.allocator) {
if img == nil {
return
}
context.allocator = allocator
destroyer := _internal_destroyers[img.which]
if destroyer != nil {
destroyer(img)
} else {
assert(img.metadata == nil)
bytes.buffer_destroy(&img.pixels)
free(img)
}
}
Which_File_Type :: enum {
Unknown,
BMP,
DjVu, // AT&T DjVu file format
EXR,
FLIF,
GIF,
HDR, // Radiance RGBE HDR
ICNS, // Apple Icon Image
JPEG,
JPEG_2000,
JPEG_XL,
NetPBM, // NetPBM family
PIC, // Softimage PIC
PNG, // Portable Network Graphics
PSD, // Photoshop PSD
QOI, // Quite Okay Image
SGI_RGB, // Silicon Graphics Image RGB file format
Sun_Rast, // Sun Raster Graphic
TGA, // Targa Truevision
TIFF, // Tagged Image File Format
WebP,
XBM, // X BitMap
}
which_bytes :: proc(data: []byte) -> Which_File_Type {
test_tga :: proc(s: string) -> bool {
get8 :: #force_inline proc(s: ^string) -> u8 {
v := s[0]
s^ = s[1:]
return v
}
get16le :: #force_inline proc(s: ^string) -> u16 {
v := u16(s[0]) | u16(s[1])<<8
s^ = s[2:]
return v
}
s := s
s = s[1:] // skip offset
color_type := get8(&s)
if color_type > 1 {
return false
}
image_type := get8(&s) // image type
if color_type == 1 { // Colormap (Paletted) Image
if image_type != 1 && image_type != 9 { // color type requires 1 or 9
return false
}
s = s[4:] // skip index of first colormap
bpcme := get8(&s) // check bits per colormap entry
if bpcme != 8 && bpcme != 15 && bpcme != 16 && bpcme != 24 && bpcme != 32 {
return false
}
s = s[4:] // skip image origin (x, y)
} else { // Normal image without colormap
if image_type != 2 && image_type != 3 && image_type != 10 && image_type != 11 {
return false
}
s = s[9:] // skip colormap specification
}
if get16le(&s) < 1 || get16le(&s) < 1 { // test width and height
return false
}
bpp := get8(&s) // bits per pixel
if color_type == 1 && bpp != 8 && bpp != 16 {
return false
}
if bpp != 8 && bpp != 15 && bpp != 16 && bpp != 24 && bpp != 32 {
return false
}
return true
}
header: [128]byte
copy(header[:], data)
s := string(header[:])
switch {
case s[:2] == "BM":
return .BMP
case s[:8] == "AT&TFORM":
switch s[12:16] {
case "DJVU", "DJVM":
return .DjVu
}
case s[:4] == "\x76\x2f\x31\x01":
return .EXR
case s[:6] == "GIF87a", s[:6] == "GIF89a":
return .GIF
case s[6:10] == "JFIF", s[6:10] == "Exif":
return .JPEG
case s[:3] == "\xff\xd8\xff":
switch s[3] {
case 0xdb, 0xee, 0xe1, 0xe0, 0xfe, 0xed:
return .JPEG
}
switch {
case s[:12] == "\xff\xd8\xff\xe0\x00\x10\x4a\x46\x49\x46\x00\x01":
return .JPEG
}
case s[:4] == "\xff\x4f\xff\x51", s[:12] == "\x00\x00\x00\x0c\x6a\x50\x20\x20\x0d\x0a\x87\x0a":
return .JPEG_2000
case s[:12] == "\x00\x00\x00\x0c\x4a\x58\x4c\x20\x0d\x0a\x87\x0a":
return .JPEG_XL
case s[0] == 'P':
switch s[2] {
case '\t', '\n', '\r':
switch s[1] {
case '1', '4': // PBM
return .NetPBM
case '2', '5': // PGM
return .NetPBM
case '3', '6': // PPM
return .NetPBM
case '7': // PAM
return .NetPBM
case 'F', 'f': // PFM
return .NetPBM
}
}
case s[:8] == "\x89PNG\r\n\x1a\n":
return .PNG
case s[:4] == "qoif":
return .QOI
case s[:2] == "\x01\xda":
return .SGI_RGB
case s[:4] == "\x59\xA6\x6A\x95":
return .Sun_Rast
case s[:4] == "MM\x2a\x00", s[:4] == "II\x00\x2A":
return .TIFF
case s[:4] == "RIFF" && s[8:12] == "WEBP":
return .WebP
case s[:8] == "#define ":
return .XBM
case s[:11] == "#?RADIANCE\n", s[:7] == "#?RGBE\n":
return .HDR
case s[:4] == "\x38\x42\x50\x53":
return .PSD
case s[:4] == "\x53\x80\xF6\x34" && s[88:92] == "PICT":
return .PIC
case s[:4] == "\x69\x63\x6e\x73":
return .ICNS
case s[:4] == "\x46\x4c\x49\x46":
return .FLIF
case:
// More complex formats
if test_tga(s) {
return .TGA
}
}
return .Unknown
}
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