Class: RFreeImage::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/rfreeimage/image.rb,
ext/rfreeimage/rfi_main.c

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 184

static VALUE Image_initialize(int argc, VALUE *argv, VALUE self)
{
	struct native_image* img;
	/* unwrap */
	Data_Get_Struct(self, struct native_image, img);

	switch (argc)
	{
		case 1:
			rd_image(self, argv[0], img, 0, 0, 0);
			break;
		case 2:
			rd_image(self, argv[0], img, NUM2INT(argv[1]), 0, 0);
			break;
		case 3:
			rd_image(self, argv[0], img, NUM2INT(argv[1]), 0, NUM2INT(argv[2]));
			break;
		default:
			rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)", argc);
			break;
	}

	return self;
}

Class Method Details

._downscale_nocopy(img, max_size) ⇒ Object 



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# File 'lib/rfreeimage/image.rb', line 73

def self._downscale_nocopy img, max_size
  return img if img.cols <= max_size && img.rows <= max_size
  nimg = img.downscale max_size
  img.destroy!
  nimg
end

.from_blob(*args) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 574

static VALUE Image_from_blob(int argc, VALUE *argv, VALUE self)
{
	ALLOC_NEW_IMAGE(v, img);

	switch (argc)
	{
		case 1:
			rd_image_blob(self, argv[0], img, 0, 0, 0);
			break;
		case 2:
			rd_image_blob(self, argv[0], img, NUM2INT(argv[1]), 0, 0);
			break;
		case 3:
			rd_image_blob(self, argv[0], img, NUM2INT(argv[1]), 0, NUM2INT(argv[2]));
			break;
		default:
			rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)", argc);
			break;
	}

	return v;
}

.from_blob_downscale(blob, max_size) ⇒ Object 



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# File 'lib/rfreeimage/image.rb', line 63

def self.from_blob_downscale blob, max_size
  # only work on jpeg
  img = Image.from_blob blob, 0, max_size
  _downscale_nocopy img, max_size
end

.from_bytes(bytes, width, height, stride, bpp) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 609

static VALUE Image_from_bytes(VALUE self, VALUE bytes, VALUE width,
		VALUE height, VALUE stride, VALUE bpp)
{
	long f_len;
	int _bpp = NUM2INT(bpp);
	char *ptr;
	unsigned char *p;
	int i;
	int src_stride = NUM2INT(stride);
	FIBITMAP *h;

	ALLOC_NEW_IMAGE(v, img);

	if (_bpp != 8 && _bpp != 32)
		rb_raise(rb_eArgError, "bpp must be 8 or 32");
	Check_Type(bytes, T_STRING);
	f_len = RSTRING_LEN(bytes);
	if (f_len < (long)src_stride * NUM2INT(height))
		rb_raise(rb_eArgError, "buffer too small");

	h = FreeImage_Allocate(NUM2INT(width), NUM2INT(height), _bpp, 0, 0, 0);
	if (!h)
		rb_raise(rb_eArgError, "fail to allocate image");

	img->handle = h;
	img->w = FreeImage_GetWidth(h);
	img->h = FreeImage_GetHeight(h);
	img->bpp = FreeImage_GetBPP(h);
	img->stride = FreeImage_GetPitch(h);
	img->fif = FIF_BMP;

	/* up-side-down */
	p = FreeImage_GetBits(img->handle);
	ptr = RSTRING_PTR(bytes) + img->h * src_stride;
	for(i = 0; i < img->h; i++) {
		ptr -= src_stride;
		memcpy(p, ptr, img->stride);
		p += img->stride;
	}

	return v;
}

.load_downscale(file, max_size) ⇒ Object 



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# File 'lib/rfreeimage/image.rb', line 57

def self.load_downscale file, max_size
  # only work on jpeg
  img = Image.new file, 0, max_size
  _downscale_nocopy img, max_size
end

.ping(file) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 562

static VALUE Image_ping(VALUE self, VALUE file)
{
	ALLOC_NEW_IMAGE(v, img);

	rd_image(self, file, img, 0, 1, 0);
	if (img->handle)
		FreeImage_Unload(img->handle);
	img->handle = NULL;

	return v;
}

.ping_blob(blob) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 597

static VALUE Image_ping_blob(VALUE self, VALUE blob)
{
	ALLOC_NEW_IMAGE(v, img);

	rd_image_blob(self, blob, img, 0, 1, 0);
	if (img->handle)
		FreeImage_Unload(img->handle);
	img->handle = NULL;

	return v;
}

Instance Method Details

#bgra? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rfreeimage/image.rb', line 44

def bgra?
	bpp == ImageBPP::BGRA
end

#bpp ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 308

static VALUE Image_bpp(VALUE self)
{
	struct native_image* img;
	Data_Get_Struct(self, struct native_image, img);
	return INT2NUM(img->bpp);
}

#buffer_addr ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 367

static VALUE Image_buffer_addr(VALUE self)
{
	struct native_image* img;
	const char *p;

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);
	p = (const char*)FreeImage_GetBits(img->handle);
	return ULONG2NUM((uintptr_t)p);
}

#bytes ⇒ Object 



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# File 'lib/rfreeimage/image.rb', line 26

def bytes
	@bytes ||= read_bytes
end

#bytes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/rfreeimage/rfi_main.c', line 378

static VALUE Image_has_bytes(VALUE self)
{
	struct native_image* img;
	Data_Get_Struct(self, struct native_image, img);
	return img->handle ? Qtrue : Qfalse;
}

#clone ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 428

static VALUE Image_clone(VALUE self)
{
	struct native_image *img;
	FIBITMAP *nh;

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);
	nh = FreeImage_Clone(img->handle);
	return rfi_get_image(nh);
}

#cols ⇒ Object Also known as: columns 



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# File 'ext/rfreeimage/rfi_main.c', line 294

static VALUE Image_cols(VALUE self)
{
	struct native_image* img;
	Data_Get_Struct(self, struct native_image, img);
	return INT2NUM(img->w);
}

#crop(_left, _top, _right, _bottom) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 537

static VALUE Image_crop(VALUE self, VALUE _left, VALUE _top, VALUE _right, VALUE _bottom)
{
	struct native_image *img;
	FIBITMAP *nh;
	int left = NUM2INT(_left);
	int top = NUM2INT(_top);
	int right = NUM2INT(_right);
	int bottom = NUM2INT(_bottom);
	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);

	if (left < 0 || top < 0
		|| right < left || bottom < top
		|| bottom > img->h || right > img->w )
		rb_raise(rb_eArgError, "Invalid boundary");

	nh = FreeImage_Copy(img->handle, left, top, right, bottom);
	return rfi_get_image(nh);
}

#destroy! ⇒ Object 



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# File 'lib/rfreeimage/image.rb', line 30

def destroy!
	release
	@bytes = nil
end

#downscale(max_size) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 459

static VALUE Image_downscale(VALUE self, VALUE max_size) {
	// down-sample resize
	struct native_image *img;
	FIBITMAP *nh;
	int i;
	int j;
	int w;
	int h;
	int scale;
	int mlen;
	int msize = NUM2INT(max_size);

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);

	mlen = img->w > img->h ? img->w : img->h;
	if (msize <= 0 || msize >= mlen) {
		nh = FreeImage_Copy(img->handle, 0, 0, img->w, img->h);
	} else {
		unsigned char *ph;
		unsigned char *pnh;
		int dst_stride;
		if (img->bpp != 8 && img->bpp != 32)
			rb_raise(rb_eArgError, "bpp not supported");

		scale = (mlen + msize - 1)  / msize;
		w = img->w / scale;
		h = img->h / scale;
		nh = FreeImage_Allocate(w, h, img->bpp, 0, 0, 0);
		if (!nh)
			rb_raise(rb_eArgError, "fail to allocate image");

		ph = FreeImage_GetBits(img->handle);
		pnh = FreeImage_GetBits(nh);
		dst_stride = FreeImage_GetPitch(nh);
		if (img->bpp == 8) {
			for(i = 0; i < h; i++) {
				for(j = 0; j < w; j++)
					*(pnh + j) = *(ph + j * scale);
				ph += img->stride * scale;
				pnh += dst_stride;
			}
		} else if (img->bpp == 32) {
			for(i = 0; i < h; i++) {
				for(j = 0; j < w; j++)
					*((unsigned int*)pnh + j) = *((unsigned int*)ph + j * scale);
				ph += img->stride * scale;
				pnh += dst_stride;
			}
		}
	}
	return rfi_get_image(nh);
}

#draw_point(_x, _y, color, _size) ⇒ Object

draw



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# File 'ext/rfreeimage/rfi_main.c', line 653

static VALUE Image_draw_point(VALUE self, VALUE _x, VALUE _y, VALUE color, VALUE _size)
{
	struct native_image* img;
	int x = NUM2INT(_x);
	int y = NUM2INT(_y);
	int size = NUM2INT(_size);
	int hs = size / 2, i, j;
	unsigned int bgra = NUM2UINT(color);
	if (size < 0)
		rb_raise(rb_eArgError, "Invalid point size: %d", size);
	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);

	for(i = -hs; i <= hs; i++) {
		for(j = -hs; j <= hs; j++) {
			if (i*i + j*j <= hs*hs)
				FreeImage_SetPixelColor(img->handle, x + i, img->h - (y + j) - 1, (RGBQUAD*)&bgra);
		}
	}

	return self;
}

#flip_horizontal ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 513

static VALUE Image_flip_horizontal(VALUE self) {
	struct native_image *img;
	FIBITMAP *nh;

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);
	nh = FreeImage_Clone(img->handle);
	if(FreeImage_FlipHorizontal(nh) == FALSE)
		rb_raise(Class_RFIError, "Malloc Failed");
	return rfi_get_image(nh);
}

#flip_vertical ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 525

static VALUE Image_flip_vertical(VALUE self) {
	struct native_image *img;
	FIBITMAP *nh;

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);
	nh = FreeImage_Clone(img->handle);
	if(FreeImage_FlipVertical(nh) == FALSE)
		rb_raise(Class_RFIError, "Malloc Failed");
	return rfi_get_image(nh);
}

#format ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 322

static VALUE Image_format(VALUE self)
{
	struct native_image* img;
	const char *p;
	Data_Get_Struct(self, struct native_image, img);
	p = FreeImage_GetFormatFromFIF(img->fif);
	return rb_str_new(p, strlen(p));
}

#gray? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rfreeimage/image.rb', line 35

def gray?
	bpp == ImageBPP::GRAY
end

#read_bytes ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 342

static VALUE Image_read_bytes(VALUE self)
{
	struct native_image* img;
	const char *p;
	char *ptr;
	unsigned stride_dst;
	int i;
	VALUE v;

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);
	p = (const char*)FreeImage_GetBits(img->handle);
	stride_dst = img->w * (img->bpp / 8);
	v = rb_str_new(NULL, stride_dst * img->h);

	/* up-side-down */
	ptr = RSTRING_PTR(v) + img->h * stride_dst;
	for(i = 0; i < img->h; i++) {
		ptr -= stride_dst;
		memcpy(ptr, p, stride_dst);
		p += img->stride;
	}
	return v;
}

#release ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 331

static VALUE Image_release(VALUE self)
{
	struct native_image* img;
	Data_Get_Struct(self, struct native_image, img);
	if (img->handle)
		FreeImage_Unload(img->handle);
	img->handle = NULL;
	return Qnil;
}

#rescale(dst_width, dst_height, filter_type) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 439

static VALUE Image_rescale(VALUE self, VALUE dst_width, VALUE dst_height, VALUE filter_type)
{
	struct native_image *img;
	FIBITMAP *nh;
	int w = NUM2INT(dst_width);
	int h = NUM2INT(dst_height);
	int f = NUM2INT(filter_type);
	if (w <= 0 || h <= 0)
		rb_raise(rb_eArgError, "Invalid size");

	if (f < FILTER_BOX || f > FILTER_LANCZOS3)
		rb_raise(rb_eArgError, "Invalid image filter type");

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);

	nh = FreeImage_Rescale(img->handle, w, h, f);
	return rfi_get_image(nh);
}

#resize(width, height, filter = Filter::FILTER_CATMULLROM) ⇒ Object 



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# File 'lib/rfreeimage/image.rb', line 53

def resize(width, height, filter = Filter::FILTER_CATMULLROM)
	return self.rescale(width, height, filter)
end

#rotate(_angle) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 416

static VALUE Image_rotate(VALUE self, VALUE _angle)
{
	struct native_image *img;
	FIBITMAP *nh;
	double angle = NUM2DBL(_angle);

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);
	nh = FreeImage_Rotate(img->handle, angle, NULL);
	return rfi_get_image(nh);
}

#rows ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 301

static VALUE Image_rows(VALUE self)
{
	struct native_image* img;
	Data_Get_Struct(self, struct native_image, img);
	return INT2NUM(img->h);
}

#save(file) ⇒ Object Also known as: write 



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# File 'ext/rfreeimage/rfi_main.c', line 212

static VALUE Image_save(VALUE self, VALUE file)
{
	char *filename;
	struct native_image* img;
	BOOL result;
	FREE_IMAGE_FORMAT out_fif;

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);

	Check_Type(file, T_STRING);
	filename = rfi_value_to_str(file);

	out_fif = FreeImage_GetFIFFromFilename(filename);
	if (out_fif == FIF_UNKNOWN) {
		free(filename);
		rb_raise(Class_RFIError, "Invalid format");
	}

	if (out_fif == FIF_JPEG && img->bpp != 8 && img->bpp != 24) {
		FIBITMAP *to_save = FreeImage_ConvertTo24Bits(img->handle);
		result = FreeImage_Save(out_fif, to_save, filename, JPEG_BASELINE);
		FreeImage_Unload(to_save);
	} else {
		result = FreeImage_Save(out_fif, img->handle, filename, 0);
	}

	free(filename);

	if(!result)
		rb_raise(rb_eIOError, "Fail to save image");
	return Qnil;
}

#stride ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 315

static VALUE Image_stride(VALUE self)
{
	struct native_image* img;
	Data_Get_Struct(self, struct native_image, img);
	return INT2NUM(img->stride);
}

#to_bgra ⇒ Object 



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# File 'lib/rfreeimage/image.rb', line 48

def to_bgra
	return self if bgra?
	to_bpp 32
end

#to_blob(type) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 246

static VALUE Image_to_blob(VALUE self, VALUE type)
{
	char *filetype;
	struct native_image* img;
	FIMEMORY *hmem;
	BOOL result;
	FREE_IMAGE_FORMAT out_fif;
	VALUE ret;
	BYTE *raw = NULL;
	DWORD file_size;

	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);

	Check_Type(type, T_STRING);
	filetype = rfi_value_to_str(type);

	out_fif = FreeImage_GetFIFFromFormat(filetype);
	free(filetype);
	if (out_fif == FIF_UNKNOWN)
		rb_raise(Class_RFIError, "Invalid format");

	hmem = FreeImage_OpenMemory(0, 0);
	if (!hmem)
		rb_raise(rb_eIOError, "Fail to allocate blob");
	if (out_fif == FIF_JPEG && img->bpp != 8 && img->bpp != 24) {
		FIBITMAP *to_save = FreeImage_ConvertTo24Bits(img->handle);
		result = FreeImage_SaveToMemory(out_fif, to_save, hmem, JPEG_BASELINE);
		FreeImage_Unload(to_save);
	} else {
		result = FreeImage_SaveToMemory(out_fif, img->handle, hmem, 0);
	}

	if(!result) {
		FreeImage_CloseMemory(hmem);
		rb_raise(rb_eIOError, "Fail to save image to blob");
	}
	file_size = FreeImage_TellMemory(hmem);
	FreeImage_SeekMemory(hmem, 0, SEEK_SET);
	FreeImage_AcquireMemory(hmem, &raw, &file_size);
	ret = rb_str_new((char*)raw, (long)file_size);
	FreeImage_CloseMemory(hmem);
	return ret;
}

#to_bpp(_bpp) ⇒ Object 



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# File 'ext/rfreeimage/rfi_main.c', line 400

static VALUE Image_to_bpp(VALUE self, VALUE _bpp)
{
	struct native_image *img;
	FIBITMAP *nh;
	int bpp = NUM2INT(_bpp);
	Data_Get_Struct(self, struct native_image, img);
	RFI_CHECK_IMG(img);
	if (bpp == img->bpp)
		return self;

	nh = convert_bpp(img->handle, bpp);
	if (!nh) rb_raise(rb_eArgError, "Invalid bpp");

	return rfi_get_image(nh);
}

#to_gray ⇒ Object 



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# File 'lib/rfreeimage/image.rb', line 39

def to_gray
	return self if gray?
	to_bpp 8
end