static int i_plinf_d(i_img *im, int l, int r, int y, const i_fcolor *vals);
static int i_gsamp_d(i_img *im, int l, int r, int y, i_sample_t *samps, const int *chans, int chan_count);
static int i_gsampf_d(i_img *im, int l, int r, int y, i_fsample_t *samps, const int *chans, int chan_count);
-/*static int i_psamp_d(i_img *im, int l, int r, int y, i_sample_t *samps, int *chans, int chan_count);
- static int i_psampf_d(i_img *im, int l, int r, int y, i_fsample_t *samps, int *chans, int chan_count);*/
+
+/*
+=item i_img_alloc()
+=category Image Implementation
+
+Allocates a new i_img structure.
+
+When implementing a new image type perform the following steps in your
+image object creation function:
+
+=over
+
+=item 1.
+
+allocate the image with i_img_alloc().
+
+=item 2.
+
+initialize any function pointers or other data as needed, you can
+overwrite the whole block if you need to.
+
+=item 3.
+
+initialize Imager's internal data by calling i_img_init() on the image
+object.
+
+=back
+
+=cut
+*/
+
+i_img *
+i_img_alloc(void) {
+ return mymalloc(sizeof(i_img));
+}
+
+/*
+=item i_img_init(C<img>)
+=category Image Implementation
+
+Imager internal initialization of images.
+
+Currently this does very little, in the future it may be used to
+support threads, or color profiles.
+
+=cut
+*/
+
+void
+i_img_init(i_img *img) {
+ img->im_data = NULL;
+}
/*
=item ICL_new_internal(r, g, b, a)
NULL, /* i_f_setcolors */
NULL, /* i_f_destroy */
+
+ i_gsamp_bits_fb,
+ NULL, /* i_f_psamp_bits */
};
/*static void set_8bit_direct(i_img *im) {
=item i_img_8_new(x, y, ch)
-=category Image creation
+=category Image creation/destruction
+
+=synopsis i_img *img = i_img_8_new(width, height, channels);
Creates a new image object I<x> pixels wide, and I<y> pixels high with
I<ch> channels.
i_img *im;
mm_log((1,"i_img_struct()\n"));
- if ( (im=mymalloc(sizeof(i_img))) == NULL)
- i_fatal(2,"malloc() error\n");
+
+ im = i_img_alloc();
*im = IIM_base_8bit_direct;
im->xsize=0;
im->ch_mask=MAXINT;
im->bytes=0;
im->idata=NULL;
+
+ i_img_init(im);
mm_log((1,"(%p) <- i_img_struct\n",im));
return im;
}
if (im == NULL)
- if ( (im=mymalloc(sizeof(i_img))) == NULL)
- i_fatal(2,"malloc() error\n");
+ im = i_img_alloc();
memcpy(im, &IIM_base_8bit_direct, sizeof(i_img));
i_tags_new(&im->tags);
memset(im->idata,0,(size_t)im->bytes);
im->ext_data = NULL;
+
+ i_img_init(im);
mm_log((1,"(%p) <- i_img_empty_ch\n",im));
return im;
}
/*
-=item i_img_destroy(im)
-
-=category Image
-
-Destroy image and free data via exorcise.
+=item i_img_destroy(C<img>)
+=order 90
+=category Image creation/destruction
+=synopsis i_img_destroy(img)
- im - Image pointer
+Destroy an image object
=cut
*/
}
/*
-=item i_img_setmask(im, ch_mask)
-
+=item i_img_setmask(C<im>, C<ch_mask>)
+=category Image Information
=synopsis // only channel 0 writeable
=synopsis i_img_setmask(img, 0x01);
-Set the image channel mask for I<im> to I<ch_mask>.
+Set the image channel mask for C<im> to C<ch_mask>.
+
+The image channel mask gives some control over which channels can be
+written to in the image.
=cut
*/
/*
-=item i_img_getmask(im)
-
-=synopsis mask = i_img_getmask(img);
+=item i_img_getmask(C<im>)
+=category Image Information
+=synopsis int mask = i_img_getmask(img);
-Get the image channel mask for I<im>.
+Get the image channel mask for C<im>.
=cut
*/
i_img_getmask(i_img *im) { return im->ch_mask; }
/*
-=item i_img_getchannels(im)
+=item i_img_getchannels(C<im>)
+=category Image Information
+=synopsis int channels = i_img_getchannels(img);
-=synopsis channels = i_img_getchannels(img);
-
-Get the number of channels in I<im>.
+Get the number of channels in C<im>.
=cut
*/
i_img_getchannels(i_img *im) { return im->channels; }
/*
-=item i_img_get_width(im)
-
-=synopsis width = i_img_get_width(im);
+=item i_img_get_width(C<im>)
+=category Image Information
+=synopsis i_img_dim width = i_img_get_width(im);
Returns the width in pixels of the image.
}
/*
-=item i_img_get_height(im)
-
-=synopsis height = i_img_get_height(im);
+=item i_img_get_height(C<im>)
+=category Image Information
+=synopsis i_img_dim height = i_img_get_height(im);
Returns the height in pixels of the image.
}
/*
-=item i_copyto_trans(im, src, x1, y1, x2, y2, tx, ty, trans)
+=item i_copyto_trans(C<im>, C<src>, C<x1>, C<y1>, C<x2>, C<y2>, C<tx>, C<ty>, C<trans>)
=category Image
-(x1,y1) (x2,y2) specifies the region to copy (in the source coordinates)
-(tx,ty) specifies the upper left corner for the target image.
-pass NULL in trans for non transparent i_colors.
+(C<x1>,C<y1>) (C<x2>,C<y2>) specifies the region to copy (in the
+source coordinates) (C<tx>,C<ty>) specifies the upper left corner for
+the target image. pass NULL in C<trans> for non transparent i_colors.
=cut
*/
}
/*
-=item i_copyto(dest, src, x1, y1, x2, y2, tx, ty)
-
-=category Image
-
-Copies image data from the area (x1,y1)-[x2,y2] in the source image to
-a rectangle the same size with it's top-left corner at (tx,ty) in the
-destination image.
-
-If x1 > x2 or y1 > y2 then the corresponding co-ordinates are swapped.
-
-=cut
-*/
-
-void
-i_copyto(i_img *im, i_img *src, int x1, int y1, int x2, int y2, int tx, int ty) {
- int x, y, t, ttx, tty;
-
- if (x2<x1) { t=x1; x1=x2; x2=t; }
- if (y2<y1) { t=y1; y1=y2; y2=t; }
- if (tx < 0) {
- /* adjust everything equally */
- x1 += -tx;
- x2 += -tx;
- tx = 0;
- }
- if (ty < 0) {
- y1 += -ty;
- y2 += -ty;
- ty = 0;
- }
- if (x1 >= src->xsize || y1 >= src->ysize)
- return; /* nothing to do */
- if (x2 > src->xsize)
- x2 = src->xsize;
- if (y2 > src->ysize)
- y2 = src->ysize;
- if (x1 == x2 || y1 == y2)
- return; /* nothing to do */
-
- mm_log((1,"i_copyto(im* %p, src %p, x1 %d, y1 %d, x2 %d, y2 %d, tx %d, ty %d)\n",
- im, src, x1, y1, x2, y2, tx, ty));
-
- if (im->bits == i_8_bits) {
- i_color *row = mymalloc(sizeof(i_color) * (x2-x1));
- tty = ty;
- for(y=y1; y<y2; y++) {
- ttx = tx;
- i_glin(src, x1, x2, y, row);
- i_plin(im, tx, tx+x2-x1, tty, row);
- tty++;
- }
- myfree(row);
- }
- else {
- i_fcolor pv;
- tty = ty;
- for(y=y1; y<y2; y++) {
- ttx = tx;
- for(x=x1; x<x2; x++) {
- i_gpixf(src, x, y, &pv);
- i_ppixf(im, ttx, tty, &pv);
- ttx++;
- }
- tty++;
- }
- }
-}
-
-/*
-=item i_copy(src)
+=item i_copy(source)
=category Image
-Creates a new image that is a copy of src.
+Creates a new image that is a copy of the image C<source>.
Tags are not copied, only the image data.
}
}
else {
- i_color temp;
- int index;
- int count;
i_palidx *vals;
- /* paletted image */
- i_img_pal_new_low(im, x1, y1, src->channels, i_maxcolors(src));
- /* copy across the palette */
- count = i_colorcount(src);
- for (index = 0; index < count; ++index) {
- i_getcolors(src, index, &temp, 1);
- i_addcolors(im, &temp, 1);
- }
-
vals = mymalloc(sizeof(i_palidx) * x1);
for (y = 0; y < y1; ++y) {
i_gpal(src, 0, x1, y, vals);
}
-/*
-=item i_flipxy(im, axis)
-
-Flips the image inplace around the axis specified.
-Returns 0 if parameters are invalid.
-
- im - Image pointer
- axis - 0 = x, 1 = y, 2 = both
-
-=cut
-*/
-
-undef_int
-i_flipxy(i_img *im, int direction) {
- int x, x2, y, y2, xm, ym;
- int xs = im->xsize;
- int ys = im->ysize;
-
- mm_log((1, "i_flipxy(im %p, direction %d)\n", im, direction ));
-
- if (!im) return 0;
-
- switch (direction) {
- case XAXIS: /* Horizontal flip */
- xm = xs/2;
- ym = ys;
- for(y=0; y<ym; y++) {
- x2 = xs-1;
- for(x=0; x<xm; x++) {
- i_color val1, val2;
- i_gpix(im, x, y, &val1);
- i_gpix(im, x2, y, &val2);
- i_ppix(im, x, y, &val2);
- i_ppix(im, x2, y, &val1);
- x2--;
- }
- }
- break;
- case YAXIS: /* Vertical flip */
- xm = xs;
- ym = ys/2;
- y2 = ys-1;
- for(y=0; y<ym; y++) {
- for(x=0; x<xm; x++) {
- i_color val1, val2;
- i_gpix(im, x, y, &val1);
- i_gpix(im, x, y2, &val2);
- i_ppix(im, x, y, &val2);
- i_ppix(im, x, y2, &val1);
- }
- y2--;
- }
- break;
- case XYAXIS: /* Horizontal and Vertical flip */
- xm = xs/2;
- ym = ys/2;
- y2 = ys-1;
- for(y=0; y<ym; y++) {
- x2 = xs-1;
- for(x=0; x<xm; x++) {
- i_color val1, val2;
- i_gpix(im, x, y, &val1);
- i_gpix(im, x2, y2, &val2);
- i_ppix(im, x, y, &val2);
- i_ppix(im, x2, y2, &val1);
-
- i_gpix(im, x2, y, &val1);
- i_gpix(im, x, y2, &val2);
- i_ppix(im, x2, y, &val2);
- i_ppix(im, x, y2, &val1);
- x2--;
- }
- y2--;
- }
- if (xm*2 != xs) { /* odd number of column */
- mm_log((1, "i_flipxy: odd number of columns\n"));
- x = xm;
- y2 = ys-1;
- for(y=0; y<ym; y++) {
- i_color val1, val2;
- i_gpix(im, x, y, &val1);
- i_gpix(im, x, y2, &val2);
- i_ppix(im, x, y, &val2);
- i_ppix(im, x, y2, &val1);
- y2--;
- }
- }
- if (ym*2 != ys) { /* odd number of rows */
- mm_log((1, "i_flipxy: odd number of rows\n"));
- y = ym;
- x2 = xs-1;
- for(x=0; x<xm; x++) {
- i_color val1, val2;
- i_gpix(im, x, y, &val1);
- i_gpix(im, x2, y, &val2);
- i_ppix(im, x, y, &val2);
- i_ppix(im, x2, y, &val1);
- x2--;
- }
- }
- break;
- default:
- mm_log((1, "i_flipxy: direction is invalid\n" ));
- return 0;
- }
- return 1;
-}
-
short psave;
i_color val,val1,val2;
i_img *new_img;
+ int has_alpha = i_img_has_alpha(im);
+ int color_chans = i_img_color_channels(im);
+ i_clear_error();
mm_log((1,"i_scaleaxis(im %p,Value %.2f,Axis %d)\n",im,Value,Axis));
-
if (Axis == XAXIS) {
hsize = (int)(0.5 + im->xsize * Value);
if (hsize < 1) {
}
new_img = i_img_empty_ch(NULL, hsize, vsize, im->channels);
+ if (!new_img) {
+ i_push_error(0, "cannot create output image");
+ return NULL;
+ }
/* 1.4 is a magic number, setting it to 2 will cause rather blurred images */
LanczosWidthFactor = (Value >= 1) ? 1 : (int) (1.4/Value);
i_gpix(im, Mx, i, &val1);
i_gpix(im, mx, i, &val2);
-
- for (k=0; k<im->channels; k++) {
- PictureValue[k] += l1[l] * val1.channel[k];
- PictureValue[k] += l0[lMax-l-1] * val2.channel[k];
+
+ if (has_alpha) {
+ i_sample_t alpha1 = val1.channel[color_chans];
+ i_sample_t alpha2 = val2.channel[color_chans];
+ for (k=0; k < color_chans; k++) {
+ PictureValue[k] += l1[l] * val1.channel[k] * alpha1 / 255;
+ PictureValue[k] += l0[lMax-l-1] * val2.channel[k] * alpha2 / 255;
+ }
+ PictureValue[color_chans] += l1[l] * val1.channel[color_chans];
+ PictureValue[color_chans] += l0[lMax-l-1] * val2.channel[color_chans];
+ }
+ else {
+ for (k=0; k<im->channels; k++) {
+ PictureValue[k] += l1[l] * val1.channel[k];
+ PictureValue[k] += l0[lMax-l-1] * val2.channel[k];
+ }
}
}
- for(k=0;k<im->channels;k++) {
- psave = (short)(0.5+(PictureValue[k] / LanczosWidthFactor));
- val.channel[k]=minmax(0,255,psave);
+
+ if (has_alpha) {
+ float fa = PictureValue[color_chans] / LanczosWidthFactor;
+ int alpha = minmax(0, 255, fa+0.5);
+ if (alpha) {
+ for (k = 0; k < color_chans; ++k) {
+ psave = (short)(0.5+(PictureValue[k] / LanczosWidthFactor * 255 / fa));
+ val.channel[k]=minmax(0,255,psave);
+ }
+ val.channel[color_chans] = alpha;
+ }
+ else {
+ /* zero alpha, so the pixel has no color */
+ for (k = 0; k < im->channels; ++k)
+ val.channel[k] = 0;
+ }
+ }
+ else {
+ for(k=0;k<im->channels;k++) {
+ psave = (short)(0.5+(PictureValue[k] / LanczosWidthFactor));
+ val.channel[k]=minmax(0,255,psave);
+ }
}
i_ppix(new_img, j, i, &val);
}
i_gpix(im, i, Mx, &val1);
i_gpix(im, i, mx, &val2);
- for (k=0; k<im->channels; k++) {
- PictureValue[k] += l1[l] * val1.channel[k];
- PictureValue[k] += l0[lMax-l-1] * val2.channel[k];
+ if (has_alpha) {
+ i_sample_t alpha1 = val1.channel[color_chans];
+ i_sample_t alpha2 = val2.channel[color_chans];
+ for (k=0; k < color_chans; k++) {
+ PictureValue[k] += l1[l] * val1.channel[k] * alpha1 / 255;
+ PictureValue[k] += l0[lMax-l-1] * val2.channel[k] * alpha2 / 255;
+ }
+ PictureValue[color_chans] += l1[l] * val1.channel[color_chans];
+ PictureValue[color_chans] += l0[lMax-l-1] * val2.channel[color_chans];
+ }
+ else {
+ for (k=0; k<im->channels; k++) {
+ PictureValue[k] += l1[l] * val1.channel[k];
+ PictureValue[k] += l0[lMax-l-1] * val2.channel[k];
+ }
+ }
+ }
+ if (has_alpha) {
+ float fa = PictureValue[color_chans] / LanczosWidthFactor;
+ int alpha = minmax(0, 255, fa+0.5);
+ if (alpha) {
+ for (k = 0; k < color_chans; ++k) {
+ psave = (short)(0.5+(PictureValue[k] / LanczosWidthFactor * 255 / fa));
+ val.channel[k]=minmax(0,255,psave);
+ }
+ val.channel[color_chans] = alpha;
+ }
+ else {
+ for (k = 0; k < im->channels; ++k)
+ val.channel[k] = 0;
}
}
- for (k=0; k<im->channels; k++) {
- psave = (short)(0.5+(PictureValue[k] / LanczosWidthFactor));
- val.channel[k] = minmax(0, 255, psave);
+ else {
+ for(k=0;k<im->channels;k++) {
+ psave = (short)(0.5+(PictureValue[k] / LanczosWidthFactor));
+ val.channel[k]=minmax(0,255,psave);
+ }
}
i_ppix(new_img, i, j, &val);
}
nxsize = (int) ((float) im->xsize * scx);
if (nxsize < 1) {
nxsize = 1;
- scx = 1 / im->xsize;
+ scx = 1.0 / im->xsize;
}
nysize = (int) ((float) im->ysize * scy);
if (nysize < 1) {
nysize = 1;
- scy = 1 / im->ysize;
+ scy = 1.0 / im->ysize;
}
+ im_assert(scx != 0 && scy != 0);
new_img=i_img_empty_ch(NULL,nxsize,nysize,im->channels);
}
/*
-=item i_sametype(i_img *im, int xsize, int ysize)
+=item i_sametype(C<im>, C<xsize>, C<ysize>)
-=category Image creation
+=category Image creation/destruction
+=synopsis i_img *img = i_sametype(src, width, height);
Returns an image of the same type (sample size, channels, paletted/direct).
}
/*
-=item i_sametype_chans(i_img *im, int xsize, int ysize, int channels)
+=item i_sametype_chans(C<im>, C<xsize>, C<ysize>, C<channels>)
-=category Image creation
+=category Image creation/destruction
+=synopsis i_img *img = i_sametype_chans(src, width, height, channels);
Returns an image of the same type (sample size).
=cut
*/
+
float
i_img_diff(i_img *im1,i_img *im2) {
int x,y,ch,xb,yb,chb;
return tdiff;
}
+/*
+=item i_img_diffd(im1, im2)
+
+Calculates the sum of the squares of the differences between
+correspoding channels in two images.
+
+If the images are not the same size then only the common area is
+compared, hence even if images are different sizes this function
+can return zero.
+
+This is like i_img_diff() but looks at floating point samples instead.
+
+=cut
+*/
+
+double
+i_img_diffd(i_img *im1,i_img *im2) {
+ int x,y,ch,xb,yb,chb;
+ double tdiff;
+ i_fcolor val1,val2;
+
+ mm_log((1,"i_img_diffd(im1 0x%x,im2 0x%x)\n",im1,im2));
+
+ xb=(im1->xsize<im2->xsize)?im1->xsize:im2->xsize;
+ yb=(im1->ysize<im2->ysize)?im1->ysize:im2->ysize;
+ chb=(im1->channels<im2->channels)?im1->channels:im2->channels;
+
+ mm_log((1,"i_img_diff: xb=%d xy=%d chb=%d\n",xb,yb,chb));
+
+ tdiff=0;
+ for(y=0;y<yb;y++) for(x=0;x<xb;x++) {
+ i_gpixf(im1,x,y,&val1);
+ i_gpixf(im2,x,y,&val2);
+
+ for(ch=0;ch<chb;ch++) {
+ double sdiff = val1.channel[ch]-val2.channel[ch];
+ tdiff += sdiff * sdiff;
+ }
+ }
+ mm_log((1,"i_img_diffd <- (%.2f)\n",tdiff));
+
+ return tdiff;
+}
+
/* just a tiny demo of haar wavelets */
i_img*
=cut
*/
+/* This function has been changed and is now faster. It's using
+ * i_gsamp instead of i_gpix */
int
i_count_colors(i_img *im,int maxc) {
struct octt *ct;
int x,y;
- int xsize,ysize;
- i_color val;
int colorcnt;
+ int channels[3];
+ int *samp_chans;
+ i_sample_t * samp;
+ int xsize = im->xsize;
+ int ysize = im->ysize;
+ int samp_cnt = 3 * xsize;
+
+ if (im->channels >= 3) {
+ samp_chans = NULL;
+ }
+ else {
+ channels[0] = channels[1] = channels[2] = 0;
+ samp_chans = channels;
+ }
+
+ ct = octt_new();
- mm_log((1,"i_count_colors(im 0x%08X,maxc %d)\n"));
+ samp = (i_sample_t *) mymalloc( xsize * 3 * sizeof(i_sample_t));
- xsize=im->xsize;
- ysize=im->ysize;
- ct=octt_new();
-
- colorcnt=0;
- for(y=0;y<ysize;y++) for(x=0;x<xsize;x++) {
- i_gpix(im,x,y,&val);
- colorcnt+=octt_add(ct,val.rgb.r,val.rgb.g,val.rgb.b);
- if (colorcnt > maxc) { octt_delete(ct); return -1; }
+ colorcnt = 0;
+ for(y = 0; y < ysize; ) {
+ i_gsamp(im, 0, xsize, y++, samp, samp_chans, 3);
+ for(x = 0; x < samp_cnt; ) {
+ colorcnt += octt_add(ct, samp[x], samp[x+1], samp[x+2]);
+ x += 3;
+ if (colorcnt > maxc) {
+ octt_delete(ct);
+ return -1;
+ }
+ }
}
+ myfree(samp);
+ octt_delete(ct);
+ return colorcnt;
+}
+
+/* sorts the array ra[0..n-1] into increasing order using heapsort algorithm
+ * (adapted from the Numerical Recipes)
+ */
+/* Needed by get_anonymous_color_histo */
+static void
+hpsort(unsigned int n, unsigned *ra) {
+ unsigned int i,
+ ir,
+ j,
+ l,
+ rra;
+
+ if (n < 2) return;
+ l = n >> 1;
+ ir = n - 1;
+ for(;;) {
+ if (l > 0) {
+ rra = ra[--l];
+ }
+ else {
+ rra = ra[ir];
+ ra[ir] = ra[0];
+ if (--ir == 0) {
+ ra[0] = rra;
+ break;
+ }
+ }
+ i = l;
+ j = 2 * l + 1;
+ while (j <= ir) {
+ if (j < ir && ra[j] < ra[j+1]) j++;
+ if (rra < ra[j]) {
+ ra[i] = ra[j];
+ i = j;
+ j++; j <<= 1; j--;
+ }
+ else break;
+ }
+ ra[i] = rra;
+ }
+}
+
+/* This function constructs an ordered list which represents how much the
+ * different colors are used. So for instance (100, 100, 500) means that one
+ * color is used for 500 pixels, another for 100 pixels and another for 100
+ * pixels. It's tuned for performance. You might not like the way I've hardcoded
+ * the maxc ;-) and you might want to change the name... */
+/* Uses octt_histo */
+int
+i_get_anonymous_color_histo(i_img *im, unsigned int **col_usage, int maxc) {
+ struct octt *ct;
+ int x,y;
+ int colorcnt;
+ unsigned int *col_usage_it;
+ i_sample_t * samp;
+ int channels[3];
+ int *samp_chans;
+
+ int xsize = im->xsize;
+ int ysize = im->ysize;
+ int samp_cnt = 3 * xsize;
+ ct = octt_new();
+
+ samp = (i_sample_t *) mymalloc( xsize * 3 * sizeof(i_sample_t));
+
+ if (im->channels >= 3) {
+ samp_chans = NULL;
+ }
+ else {
+ channels[0] = channels[1] = channels[2] = 0;
+ samp_chans = channels;
+ }
+
+ colorcnt = 0;
+ for(y = 0; y < ysize; ) {
+ i_gsamp(im, 0, xsize, y++, samp, samp_chans, 3);
+ for(x = 0; x < samp_cnt; ) {
+ colorcnt += octt_add(ct, samp[x], samp[x+1], samp[x+2]);
+ x += 3;
+ if (colorcnt > maxc) {
+ octt_delete(ct);
+ return -1;
+ }
+ }
+ }
+ myfree(samp);
+ /* Now that we know the number of colours... */
+ col_usage_it = *col_usage = (unsigned int *) mymalloc(colorcnt * sizeof(unsigned int));
+ octt_histo(ct, &col_usage_it);
+ hpsort(colorcnt, *col_usage);
octt_delete(ct);
return colorcnt;
}
}
}
else {
+ if (chan_count <= 0 || chan_count > im->channels) {
+ i_push_errorf(0, "chan_count %d out of range, must be >0, <= channels",
+ chan_count);
+ return 0;
+ }
for (i = 0; i < w; ++i) {
for (ch = 0; ch < chan_count; ++ch) {
*samps++ = data[ch];
}
}
else {
+ if (chan_count <= 0 || chan_count > im->channels) {
+ i_push_errorf(0, "chan_count %d out of range, must be >0, <= channels",
+ chan_count);
+ return 0;
+ }
for (i = 0; i < w; ++i) {
for (ch = 0; ch < chan_count; ++ch) {
*samps++ = Sample8ToF(data[ch]);
/*
=back
+=head2 Fallback handler
+
+=over
+
+=item i_gsamp_bits_fb
+
+=cut
+*/
+
+int
+i_gsamp_bits_fb(i_img *im, int l, int r, int y, unsigned *samps,
+ const int *chans, int chan_count, int bits) {
+ if (bits < 1 || bits > 32) {
+ i_push_error(0, "Invalid bits, must be 1..32");
+ return -1;
+ }
+
+ if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
+ double scale;
+ int ch, count, i, w;
+
+ if (bits == 32)
+ scale = 4294967295.0;
+ else
+ scale = (double)(1 << bits) - 1;
+
+ if (r > im->xsize)
+ r = im->xsize;
+ w = r - l;
+ count = 0;
+
+ if (chans) {
+ /* make sure we have good channel numbers */
+ for (ch = 0; ch < chan_count; ++ch) {
+ if (chans[ch] < 0 || chans[ch] >= im->channels) {
+ i_push_errorf(0, "No channel %d in this image", chans[ch]);
+ return -1;
+ }
+ }
+ for (i = 0; i < w; ++i) {
+ i_fcolor c;
+ i_gpixf(im, l+i, y, &c);
+ for (ch = 0; ch < chan_count; ++ch) {
+ *samps++ = (unsigned)(c.channel[ch] * scale + 0.5);
+ ++count;
+ }
+ }
+ }
+ else {
+ if (chan_count <= 0 || chan_count > im->channels) {
+ i_push_error(0, "Invalid channel count");
+ return -1;
+ }
+ for (i = 0; i < w; ++i) {
+ i_fcolor c;
+ i_gpixf(im, l+i, y, &c);
+ for (ch = 0; ch < chan_count; ++ch) {
+ *samps++ = (unsigned)(c.channel[ch] * scale + 0.5);
+ ++count;
+ }
+ }
+ }
+
+ return count;
+ }
+ else {
+ i_push_error(0, "Image position outside of image");
+ return -1;
+ }
+}
+
+/*
+=back
+
=head2 Stream reading and writing wrapper functions
=over
/* bzip2 compressed */
FORMAT_ENTRY("BZh", "bzip2"),
+
+ /* WEBP
+ http://code.google.com/speed/webp/docs/riff_container.html */
+ FORMAT_ENTRY2("RIFF WEBP", "webp", "xxxx xxxx"),
+
+ /* JPEG 2000
+ This might match a little loosely */
+ FORMAT_ENTRY("\x00\x00\x00\x0CjP \x0D\x0A\x87\x0A", "jp2"),
};
static const struct magic_entry more_formats[] = {
/* these were originally both listed as ico, but cur files can
/*
=item i_img_is_monochrome(img, &zero_is_white)
+=category Image Information
+
Tests an image to check it meets our monochrome tests.
The idea is that a file writer can use this to test where it should
-write the image in whatever bi-level format it uses, eg. pbm for pnm.
+write the image in whatever bi-level format it uses, eg. C<pbm> for
+C<pnm>.
For performance of encoders we require monochrome images:
=item *
-have a palette of two colors, containing only (0,0,0) and
-(255,255,255) in either order.
+have a palette of two colors, containing only C<(0,0,0)> and
+C<(255,255,255)> in either order.
=back
-zero_is_white is set to non-zero iff the first palette entry is white.
+C<zero_is_white> is set to non-zero if the first palette entry is white.
=cut
*/
colors[1].rgb.r == 0 &&
colors[1].rgb.g == 0 &&
colors[1].rgb.b == 0) {
- *zero_is_white = 0;
+ *zero_is_white = 1;
return 1;
}
else if (colors[0].rgb.r == 0 &&
colors[1].rgb.r == 255 &&
colors[1].rgb.g == 255 &&
colors[1].rgb.b == 255) {
- *zero_is_white = 1;
+ *zero_is_white = 0;
return 1;
}
}
else if (im->channels == 1) {
if (colors[0].channel[0] == 255 &&
- colors[1].channel[1] == 0) {
- *zero_is_white = 0;
+ colors[1].channel[0] == 0) {
+ *zero_is_white = 1;
return 1;
}
else if (colors[0].channel[0] == 0 &&
- colors[0].channel[0] == 255) {
- *zero_is_white = 1;
+ colors[1].channel[0] == 255) {
+ *zero_is_white = 0;
return 1;
}
}
return 0;
}
+/*
+=item i_get_file_background(im, &bg)
+
+=category Files
+
+Retrieve the file write background color tag from the image.
+
+If not present, returns black.
+
+=cut
+*/
+
+void
+i_get_file_background(i_img *im, i_color *bg) {
+ if (!i_tags_get_color(&im->tags, "i_background", 0, bg)) {
+ /* black default */
+ bg->channel[0] = bg->channel[1] = bg->channel[2] = 0;
+ }
+ /* always full alpha */
+ bg->channel[3] = 255;
+}
+
+/*
+=item i_get_file_backgroundf(im, &bg)
+
+=category Files
+
+Retrieve the file write background color tag from the image as a
+floating point color.
+
+Implemented in terms of i_get_file_background().
+
+If not present, returns black.
+
+=cut
+*/
+
+void
+i_get_file_backgroundf(i_img *im, i_fcolor *fbg) {
+ i_color bg;
+
+ i_get_file_background(im, &bg);
+ fbg->rgba.r = Sample8ToF(bg.rgba.r);
+ fbg->rgba.g = Sample8ToF(bg.rgba.g);
+ fbg->rgba.b = Sample8ToF(bg.rgba.b);
+ fbg->rgba.a = 1.0;
+}
+
/*
=back
projects / imager.git / blobdiff