我正在尝试使用URLImage.createToStorage从网址中提取图片。但是，我希望该图片显示为圆形，因此我在图像中添加了一个蒙版。但是，当我运行标签时，只显示占位符图像，而不是网址图像。当我注释掉将圆形蒙版添加到图像时显示图像的代码。我的圆形图像代码有问题吗。我使用了Display.getInstance（）。callSerially（）。
//Where I display the image.
public void setUpProfile(Form f) {
Label imageLabel = findMyImage(f);
Image img = getImageFromRes("myprofile.png");
Image scaled = img.scaledWidth(f.getWidth() / 2);
EncodedImage enc = EncodedImage.createFromImage(scaled, false);
Display.getInstance().callSerially(new Runnable() {
@Override
public void run() {
imageLabel.setIcon(getRoundedImage(URLImage.createToStorage(enc,
"profileImage8", me.getPicture(), URLImage.RESIZE_SCALE_TO_FILL)));
f.revalidate();
}
});
findProfNameLabel(f).setText(me.getName());
findProfAgeLabel(f).setText(me.getAge() + " Years old");
findProfPrefLabel(f).setText("Interested in " + me.getPref());
}
public Image getRoundedImage(Image img) {
int w = img.getWidth();
int h = img.getHeight();
Image maskImage = Image.createImage(w, h);
Graphics g = maskImage.getGraphics();
g.setColor(0xffffff);
g.fillArc(0, 0, w, h, 0, 360);
Object mask = maskImage.createMask();
Image ret = img.applyMask(mask);
return ret;
}
在Form的beforeShow中调用setUpProfile（）方法。
编辑：我在使用URLImage.createMaskAdapter的工作setUpProfile（）方法中编辑。并实现圆润的图像。
public void setUpProfile(Form f) {
Label imageLabel = findMyImage(f);
Image mask = getImageFromRes("rounded-mask.png");
Image placeholder = getImageFromRes("myprofile.png").scaled(mask.getWidth(), mask.getHeight());
EncodedImage enc = EncodedImage.createFromImage(placeholder.applyMask(mask.createMask()),
false);
System.out.println("SetUpProfile picture " + me.getPicture());
imageLabel.setIcon(URLImage.createToStorage(enc, "profileImage8",
me.getPicture(), URLImage.createMaskAdapter(mask)));
findProfNameLabel(f).setText(me.getName());
findProfAgeLabel(f).setText(me.getAge() + " Years old");
findProfPrefLabel(f).setText("Interested in " + me.getPref());
}
答案 0 :(得分：1)
您可以通过创建自定义#include <gtk/gtk.h>
/* There are two reasonable sizes for a rotated image-- Either the minimum */
/* bounding box which contains all rotated pixels (and a bunch of white space)*/
/* or the maximum rectangle where all pixels come from the source image (but */
/* where we lose some of the corners) */
/* The first is easy to calculate: The minimum bounding box will have the corners */
/* of the rotated image on its edges, this leaves us with four triangles in */
/* the corners of the bb. Two triangles have edges width*sin(theta), width*cos(theta) */
/* and two have edges height*sin(theta), height*cos(theta) */
/* so the new width height will be the sum of two adjacent triangle edges: */
/* width" = width*cos + height*sin */
/* height"= width*sin + height*cos */
/* Now for the maximum inscribed rectangle we draw a similar picture (except */
/* the unknown rectangle is internal now) and get similar triangles. Here the*/
/* equations are: */
/* width = width'*cos + height'*sin */
/* height= width'*sin + height'*cos */
/* solving for height'... */
/* height' = (width-width'*cos)/sin */
/* height' = (height-width'*sin)/cos */
/* (width-width'*cos)/sin = (height-width'*sin)/cos */
/* width*cos - width'*cos^2 = height*sin - width'*sin^2 */
/* width' * (sin^2-cos^2) = height*sin-width*cos */
/* width' = (height*sin - width*cos)/(sin^2-cos^2) */
/* height'= (width*sin - height*cos)/(sin^2-cos^2) */
/* Note this produces garbage (0/0) when rotated by 45 degrees (135,225,...) */
/* A little experimentation shows that at 45 degrees the only thing with */
/* an internal rectangle is a square, all other aspect ratios have a height */
/* of 0. A square, however, has an internal square with sides 1/sqrt(2) of the original */
/* When creating a full_size image (minimum bounding box) we should return */
/* an image with an alpha channel (whether the original had one or no). */
/* otherwise we should create an alpha channel only if the original had one */
/* A pixel at (x,y) will be rotated to: */
/* ((x-width/2)*cos + (y-height/2)*sin + width'/2 , */
/* =(x-width/2)*sin + (y-height/2)*cos + height'/2 ) */
/* A pixel at (x',y') will have come from: */
/* ((x'-width'/2)*cos - (y'-height'/2)*sin + width/2 , */
/* (x'-width'/2)*sin + (y'-height'/2)*cos + height/2 ) */
static GdkPixbuf *gdk_pixbuf_rotate(GdkPixbuf *src,double radian,gboolean full_size) {
double s = sin(radian), c = cos(radian);
double as= s<0 ? -s : s, ac= c<0 ? -c : c;
int width, height, nwidth, nheight;
int hasalpha, nhasalpha;
GdkPixbuf *ret;
int nr,nc,r,col;
double nmodr, nmodc;
int alpha=0;
guchar *pixels, *npixels, *pt, *npt;
int rowstride, nrowstride, pixellen;
if ( src==NULL )
return( NULL );
width = gdk_pixbuf_get_width(src);
height = gdk_pixbuf_get_height(src);
hasalpha = gdk_pixbuf_get_has_alpha(src);
rowstride = gdk_pixbuf_get_rowstride(src);
pixels = gdk_pixbuf_get_pixels(src);
pixellen = hasalpha ? 4 : 3;
if ( full_size ) {
nwidth = round( ac*width + as*height );
nheight= round( as*width + ac*height );
nhasalpha = TRUE;
} else {
double denom = as*as - ac*ac;
if ( denom<.1e-7 && denom>-1.e-7 ) {
if ( width!=height )
return( NULL );
nwidth = nheight = round( width/sqrt(2.0) );
} else {
nwidth = round( (height*as - width*ac)/denom );
nheight = round( (width*as - height*ac)/denom );
}
if ( nwidth<=0 || nheight<=0 )
return( NULL );
nhasalpha = hasalpha;
}
ret = gdk_pixbuf_new(GDK_COLORSPACE_RGB,nhasalpha,8,nwidth,nheight);
if ( ret==NULL )
return( NULL );
nrowstride = gdk_pixbuf_get_rowstride(ret);
npixels = gdk_pixbuf_get_pixels(ret);
for ( nr=0; nr<nheight; ++nr ) {
nmodr = nr-nheight/2.0;
npt = npixels + nr*nrowstride;
for ( nc=0; nc<nwidth; ++nc ) {
nmodc = nc-nwidth/2.0;
/* Where did this pixel come from? */
r = round( height/2 - nmodc*s + nmodr*c );
col = round( width/2 + nmodc*c + nmodr*s );
if ( r<0 || col<0 || r>=height || col>=width ) {
alpha = 0;
if ( r<0 ) r=0;
else if ( r>=height ) r = height-1;
if ( col<0 ) col = 0;
else if ( col>=width ) col = width-1;
} else
alpha = 0xff;
pt = pixels + r*rowstride + col*pixellen;
*npt++ = *pt++;
*npt++ = *pt++;
*npt++ = *pt++;
if ( hasalpha && alpha!=0 )
alpha = *pt;
if ( nhasalpha )
*npt++ = alpha;
}
}
return( ret );
}来实现此目的，该自定义ImageAdapter会在下载图片时自动为您生成round-mask。
public static final URLImage.ImageAdapter RESIZE_SCALE_WITH_ROUND_MASK = new URLImage.ImageAdapter() {
@Override
public EncodedImage adaptImage(EncodedImage downloadedImage, EncodedImage placeholderImage) {
Image tmp = downloadedImage.scaledLargerRatio(placeholderImage.getWidth(), placeholderImage.getHeight());
if (tmp.getWidth() > placeholderImage.getWidth()) {
int diff = tmp.getWidth() - placeholderImage.getWidth();
int x = diff / 2;
tmp = tmp.subImage(x, 0, placeholderImage.getWidth(), placeholderImage.getHeight(), true);
} else if (tmp.getHeight() > placeholderImage.getHeight()) {
int diff = tmp.getHeight() - placeholderImage.getHeight();
int y = diff / 2;
tmp = tmp.subImage(0, y, Math.min(placeholderImage.getWidth(), tmp.getWidth()),
Math.min(placeholderImage.getHeight(), tmp.getHeight()), true);
}
Image roundMask = Image.createImage(tmp.getWidth(), tmp.getHeight(), 0xff000000);
Graphics gr = roundMask.getGraphics();
gr.setColor(0xffffff);
gr.fillArc(0, 0, tmp.getWidth(), tmp.getHeight(), 0, 360);
Object mask = roundMask.createMask();
tmp = tmp.applyMask(mask);
return EncodedImage.createFromImage(tmp, false);
}
@Override
public boolean isAsyncAdapter() {
return true;
}
};
然后以这种方式应用：
public void setUpProfile(Form f) {
Label imageLabel = findMyImage(f);
Image img = getImageFromRes("myprofile.png");
Image scaled = img.scaledWidth(f.getWidth() / 2);
EncodedImage enc = EncodedImage.createFromImage(scaled, false);
Display.getInstance().callSerially(new Runnable() {
@Override
public void run() {
imageLabel.setIcon(URLImage.createToStorage(enc,
"profileImage8", me.getPicture(), RESIZE_SCALE_WITH_ROUND_MASK));
f.revalidate();
}
});
findProfNameLabel(f).setText(me.getName());
findProfAgeLabel(f).setText(me.getAge() + " Years old");
findProfPrefLabel(f).setText("Interested in " + me.getPref());
}