Class: GMagick::Image
- Inherits:
-
Object
- Object
- GMagick::Image
- Defined in:
- ext/image/image.c
Instance Attribute Summary collapse
-
#blob ⇒ Object
Define our instance methods.
Class Method Summary collapse
-
.format(rb_image_blob) ⇒ Object
Define our class methods.
Instance Method Summary collapse
- #alpha_unpack ⇒ Object
- #colorspace ⇒ Object
- #depth ⇒ Object
- #height ⇒ Object
- #initialize(rb_image_blob) ⇒ Object constructor
- #unpack ⇒ Object
- #width ⇒ Object
Constructor Details
#initialize(rb_image_blob) ⇒ Object
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# File 'ext/image/image.c', line 28
VALUE image_initialize(VALUE self, VALUE rb_image_blob)
{
rb_funcall(self, rb_intern("blob="), 1, rb_image_blob);
return Qtrue;
}
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Instance Attribute Details
#blob ⇒ Object
Define our instance methods
Class Method Details
.format(rb_image_blob) ⇒ Object
Define our class methods
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# File 'ext/image/image.c', line 5
VALUE format(VALUE self, VALUE rb_image_blob)
{
const char *format = NULL;
long double image_blob_length = RSTRING_LEN(rb_image_blob);
char *image_blob = RSTRING_PTR(rb_image_blob);
InitializeMagick(".");
MagickWand *magick_wand = NewMagickWand();
MagickReadImageBlob(magick_wand, (const unsigned char *)image_blob, image_blob_length);
format = MagickGetImageFormat(magick_wand);
DestroyMagickWand(magick_wand);
DestroyMagick();
if (format) {
return rb_str_new2(format);
} else {
return Qnil;
}
}
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Instance Method Details
#alpha_unpack ⇒ Object
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# File 'ext/image/image.c', line 160
VALUE image_alpha_unpack(VALUE self)
{
InitializeMagick(".");
MagickWand *magick_wand = NewMagickWand();
VALUE rb_blob = rb_funcall(self, rb_intern("blob"), 0);
long double image_blob_length = RSTRING_LEN(rb_blob);
char *image_blob = RSTRING_PTR(rb_blob);
MagickReadImageBlob(magick_wand, image_blob, image_blob_length);
unsigned long height = MagickGetImageHeight(magick_wand);
unsigned long width = MagickGetImageWidth(magick_wand);
int pixel_count = height * width;
unsigned char *pixels;
pixels = (unsigned char *)malloc(pixel_count * sizeof(char));
MagickGetImagePixels(magick_wand, 0, 0, width, height, "A", CharPixel, pixels);
VALUE rb_pixels = rb_str_new((const char *)pixels, pixel_count);
free(pixels);
DestroyMagickWand(magick_wand);
DestroyMagick();
return rb_pixels;
}
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#colorspace ⇒ Object
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# File 'ext/image/image.c', line 92
VALUE image_colorspace(VALUE self)
{
InitializeMagick(".");
MagickWand *magick_wand = NewMagickWand();
VALUE rb_blob = rb_funcall(self, rb_intern("blob"), 0);
long double image_blob_length = RSTRING_LEN(rb_blob);
char *image_blob = RSTRING_PTR(rb_blob);
MagickReadImageBlob(magick_wand, image_blob, image_blob_length);
ColorspaceType color_space = MagickGetImageColorspace(magick_wand);
DestroyMagickWand(magick_wand);
DestroyMagick();
if (color_space == RGBColorspace) {
return ID2SYM(rb_intern("DeviceRGB"));
} else if (color_space == CMYKColorspace) {
return ID2SYM(rb_intern("DeviceCMYK"));
} else {
rb_raise(rb_eTypeError, "Unknown colorspace");
}
}
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#depth ⇒ Object
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# File 'ext/image/image.c', line 34
VALUE image_depth(VALUE self)
{
InitializeMagick(".");
MagickWand *magick_wand = NewMagickWand();
VALUE rb_blob = rb_funcall(self, rb_intern("blob"), 0);
long double image_blob_length = RSTRING_LEN(rb_blob);
char *image_blob = RSTRING_PTR(rb_blob);
MagickReadImageBlob(magick_wand, image_blob, image_blob_length);
unsigned long depth = MagickGetImageDepth(magick_wand);
DestroyMagickWand(magick_wand);
DestroyMagick();
return INT2NUM(depth);
}
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#height ⇒ Object
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# File 'ext/image/image.c', line 73
VALUE image_height(VALUE self)
{
InitializeMagick(".");
MagickWand *magick_wand = NewMagickWand();
VALUE rb_blob = rb_funcall(self, rb_intern("blob"), 0);
long double image_blob_length = RSTRING_LEN(rb_blob);
char *image_blob = RSTRING_PTR(rb_blob);
MagickReadImageBlob(magick_wand, image_blob, image_blob_length);
unsigned long height = MagickGetImageHeight(magick_wand);
DestroyMagickWand(magick_wand);
DestroyMagick();
return INT2NUM(height);
}
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#unpack ⇒ Object
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# File 'ext/image/image.c', line 117
VALUE image_unpack(VALUE self)
{
InitializeMagick(".");
MagickWand *magick_wand = NewMagickWand();
VALUE rb_blob = rb_funcall(self, rb_intern("blob"), 0);
long double image_blob_length = RSTRING_LEN(rb_blob);
char *image_blob = RSTRING_PTR(rb_blob);
MagickReadImageBlob(magick_wand, image_blob, image_blob_length);
ColorspaceType color_space = MagickGetImageColorspace(magick_wand);
unsigned long height = MagickGetImageHeight(magick_wand);
unsigned long width = MagickGetImageWidth(magick_wand);
int pixel_count = height * width;
int buffer_size;
char color_format[8];
unsigned char *pixels;
if (color_space == RGBColorspace) {
buffer_size = 3 * pixel_count;
strcpy(color_format, "RGB");
} else if (color_space == CMYKColorspace) {
buffer_size = 4 * pixel_count;
strcpy(color_format, "CMYK");
} else {
rb_raise(rb_eTypeError, "Unknown colorspace");
}
pixels = (unsigned char *)malloc(buffer_size * sizeof(char));
MagickGetImagePixels(magick_wand, 0, 0, width, height, color_format, CharPixel, pixels);
VALUE rb_pixels = rb_str_new((const char *)pixels, buffer_size);
free(pixels);
DestroyMagickWand(magick_wand);
DestroyMagick();
return rb_pixels;
}
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#width ⇒ Object
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# File 'ext/image/image.c', line 53
VALUE image_width(VALUE self)
{
InitializeMagick(".");
MagickWand *magick_wand = NewMagickWand();
VALUE rb_blob = rb_funcall(self, rb_intern("blob"), 0);
long double image_blob_length = RSTRING_LEN(rb_blob);
char *image_blob = RSTRING_PTR(rb_blob);
MagickReadImageBlob(magick_wand, image_blob, image_blob_length);
unsigned long width = MagickGetImageWidth(magick_wand);
DestroyMagickWand(magick_wand);
DestroyMagick();
return INT2NUM(width);
}
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