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-rw-r--r--src/rxvtimg.C977
-rw-r--r--src/rxvtimg.h152
2 files changed, 1129 insertions, 0 deletions
diff --git a/src/rxvtimg.C b/src/rxvtimg.C
new file mode 100644
index 0000000..174861b
--- /dev/null
+++ b/src/rxvtimg.C
@@ -0,0 +1,977 @@
+/*----------------------------------------------------------------------*
+ * File: rxvtimg.C
+ *----------------------------------------------------------------------*
+ *
+ * All portions of code are copyright by their respective author/s.
+ * Copyright (c) 2012 Marc Lehmann <schmorp@schmorp.de>
+ * Copyright (c) 2012 Emanuele Giaquinta <e.giaquinta@glauco.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *---------------------------------------------------------------------*/
+
+#include <string.h>
+#include <math.h>
+#include "../config.h"
+#include "rxvt.h"
+
+#if HAVE_IMG
+
+typedef rxvt_img::nv nv;
+
+namespace
+{
+ struct mat3x3
+ {
+ nv v[3][3];
+
+ mat3x3 ()
+ {
+ }
+
+ mat3x3 (const nv *matrix)
+ {
+ memcpy (v, matrix, sizeof (v));
+ }
+
+ mat3x3 (nv v11, nv v12, nv v13, nv v21, nv v22, nv v23, nv v31, nv v32, nv v33)
+ {
+ v[0][0] = v11; v[0][1] = v12; v[0][2] = v13;
+ v[1][0] = v21; v[1][1] = v22; v[1][2] = v23;
+ v[2][0] = v31; v[2][1] = v32; v[2][2] = v33;
+ }
+
+ mat3x3 inverse ();
+
+ nv *operator [](int i) { return &v[i][0]; }
+ const nv *operator [](int i) const { return &v[i][0]; }
+
+ operator const nv * () const { return &v[0][0]; }
+ operator nv * () { return &v[0][0]; }
+
+ // quite inefficient, hopefully gcc pulls the w calc out of any loops
+ nv apply1 (int i, nv x, nv y)
+ {
+ mat3x3 &m = *this;
+
+ nv v = m[i][0] * x + m[i][1] * y + m[i][2];
+ nv w = m[2][0] * x + m[2][1] * y + m[2][2];
+
+ return v * (1. / w);
+ }
+
+ static mat3x3 translate (nv x, nv y);
+ static mat3x3 scale (nv s, nv t);
+ static mat3x3 rotate (nv phi);
+ };
+
+ mat3x3
+ mat3x3::inverse ()
+ {
+ mat3x3 &m = *this;
+ mat3x3 inv;
+
+ nv s0 = m[2][2] * m[1][1] - m[2][1] * m[1][2];
+ nv s1 = m[2][1] * m[0][2] - m[2][2] * m[0][1];
+ nv s2 = m[1][2] * m[0][1] - m[1][1] * m[0][2];
+
+ nv invdet = 1. / (m[0][0] * s0 + m[1][0] * s1 + m[2][0] * s2);
+
+ inv[0][0] = invdet * s0;
+ inv[0][1] = invdet * s1;
+ inv[0][2] = invdet * s2;
+
+ inv[1][0] = invdet * (m[2][0] * m[1][2] - m[2][2] * m[1][0]);
+ inv[1][1] = invdet * (m[2][2] * m[0][0] - m[2][0] * m[0][2]);
+ inv[1][2] = invdet * (m[1][0] * m[0][2] - m[1][2] * m[0][0]);
+
+ inv[2][0] = invdet * (m[2][1] * m[1][0] - m[2][0] * m[1][1]);
+ inv[2][1] = invdet * (m[2][0] * m[0][1] - m[2][1] * m[0][0]);
+ inv[2][2] = invdet * (m[1][1] * m[0][0] - m[1][0] * m[0][1]);
+
+ return inv;
+ }
+
+ static mat3x3
+ operator *(const mat3x3 &a, const mat3x3 &b)
+ {
+ mat3x3 r;
+
+ for (int i = 0; i < 3; ++i)
+ for (int j = 0; j < 3; ++j)
+ r[i][j] = a[i][0] * b[0][j]
+ + a[i][1] * b[1][j]
+ + a[i][2] * b[2][j];
+
+ return r;
+ }
+
+ mat3x3
+ mat3x3::translate (nv x, nv y)
+ {
+ return mat3x3 (
+ 1, 0, x,
+ 0, 1, y,
+ 0, 0, 1
+ );
+ }
+
+ mat3x3
+ mat3x3::scale (nv s, nv t)
+ {
+ return mat3x3 (
+ s, 0, 0,
+ 0, t, 0,
+ 0, 0, 1
+ );
+ }
+
+ // clockwise
+ mat3x3
+ mat3x3::rotate (nv phi)
+ {
+ nv s = sin (phi);
+ nv c = cos (phi);
+
+ return mat3x3 (
+ c, -s, 0,
+ s, c, 0,
+ 0, 0, 1
+ );
+ }
+
+ struct composer
+ {
+ rxvt_img *srcimg, *dstimg;
+ Picture src, dst, msk;
+ Display *dpy;
+
+ ecb_noinline
+ composer (rxvt_img *srcimg, rxvt_img *dstimg = 0)
+ : srcimg (srcimg), dstimg (dstimg), msk (0)
+ {
+ if (!this->dstimg)
+ this->dstimg = srcimg->new_empty ();
+ else if (!this->dstimg->pm) // somewhat unsatisfying
+ this->dstimg->alloc ();
+
+ dpy = srcimg->d->dpy;
+ src = srcimg->picture ();
+ dst = this->dstimg->picture ();
+ }
+
+ ecb_noinline
+ void mask (bool rgb = true, int w = 1, int h = 1)
+ {
+ Pixmap pixmap = XCreatePixmap (dpy, srcimg->pm, w, h, rgb ? 32 : 8);
+
+ XRenderPictFormat *format = XRenderFindStandardFormat (dpy, rgb ? PictStandardARGB32 : PictStandardA8);
+ XRenderPictureAttributes pa;
+ pa.repeat = RepeatNormal;
+ pa.component_alpha = rgb;
+ msk = XRenderCreatePicture (dpy, pixmap, format, CPRepeat | CPComponentAlpha, &pa);
+
+ XFreePixmap (dpy, pixmap);
+
+ ecb_assume (msk);
+ }
+
+ // CreateSolidFill creates a very very very weird picture
+ void mask (const rgba &c)
+ {
+ // the casts are needed in C++11 (see 8.5.1)
+ XRenderColor rc = {
+ (unsigned short)(c.r * c.a / 65535),
+ (unsigned short)(c.g * c.a / 65535),
+ (unsigned short)(c.b * c.a / 65535),
+ c.a
+ };
+ msk = XRenderCreateSolidFill (dpy, &rc);
+ ecb_assume (msk);
+ }
+
+ void fill (const rgba &c)
+ {
+ XRenderColor rc = {
+ (unsigned short)(c.r * c.a / 65535),
+ (unsigned short)(c.g * c.a / 65535),
+ (unsigned short)(c.b * c.a / 65535),
+ c.a
+ };
+
+ XRenderFillRectangle (dpy, PictOpSrc, msk, &rc, 0, 0, 1, 1);
+ }
+
+ operator rxvt_img *()
+ {
+ return dstimg;
+ }
+
+ ecb_noinline
+ ~composer ()
+ {
+ XRenderFreePicture (dpy, src);
+ XRenderFreePicture (dpy, dst);
+ if (msk) XRenderFreePicture (dpy, msk);
+ }
+ };
+}
+
+static XRenderPictFormat *
+find_alpha_format_for (Display *dpy, XRenderPictFormat *format)
+{
+ if (format->direct.alphaMask)
+ return format; // already has alpha
+
+ // try to find a suitable alpha format, one bit alpha is enough for our purposes
+ if (format->type == PictTypeDirect)
+ for (int n = 0; XRenderPictFormat *f = XRenderFindFormat (dpy, 0, 0, n); ++n)
+ if (f->direct.alphaMask
+ && f->type == PictTypeDirect
+ && ecb_popcount32 (f->direct.redMask ) >= ecb_popcount32 (format->direct.redMask )
+ && ecb_popcount32 (f->direct.greenMask) >= ecb_popcount32 (format->direct.greenMask)
+ && ecb_popcount32 (f->direct.blueMask ) >= ecb_popcount32 (format->direct.blueMask ))
+ return f;
+
+ // should be a very good fallback
+ return XRenderFindStandardFormat (dpy, PictStandardARGB32);
+}
+
+rxvt_img::rxvt_img (rxvt_screen *screen, XRenderPictFormat *format, int x, int y, int width, int height, int repeat)
+: d(screen->display), x(x), y(y), w(width), h(height), format(format), repeat(repeat),
+ pm(0), ref(0)
+{
+}
+
+rxvt_img::rxvt_img (rxvt_display *display, XRenderPictFormat *format, int x, int y, int width, int height, int repeat)
+: d(display), x(x), y(y), w(width), h(height), format(format), repeat(repeat),
+ pm(0), ref(0)
+{
+}
+
+rxvt_img::rxvt_img (const rxvt_img &img)
+: d(img.d), x(img.x), y(img.y), w(img.w), h(img.h), format(img.format), repeat(img.repeat), pm(img.pm), ref(img.ref)
+{
+ ++ref->cnt;
+}
+
+rxvt_img *
+rxvt_img::new_from_root (rxvt_screen *s)
+{
+ Display *dpy = s->dpy;
+ unsigned int root_pm_w, root_pm_h;
+ Pixmap root_pixmap = s->display->get_pixmap_property (s->display->xa [XA_XROOTPMAP_ID]);
+ if (root_pixmap == None)
+ root_pixmap = s->display->get_pixmap_property (s->display->xa [XA_ESETROOT_PMAP_ID]);
+
+ if (root_pixmap == None)
+ return 0;
+
+ Window wdummy;
+ int idummy;
+ unsigned int udummy;
+
+ if (!XGetGeometry (dpy, root_pixmap, &wdummy, &idummy, &idummy, &root_pm_w, &root_pm_h, &udummy, &udummy))
+ return 0;
+
+ rxvt_img *img = new rxvt_img (
+ s,
+ XRenderFindVisualFormat (dpy, DefaultVisual (dpy, s->display->screen)),
+ 0,
+ 0,
+ root_pm_w,
+ root_pm_h
+ );
+
+ img->pm = root_pixmap;
+ img->ref = new pixref (root_pm_w, root_pm_h);
+ img->ref->ours = false;
+
+ return img;
+}
+
+# if HAVE_PIXBUF
+
+rxvt_img *
+rxvt_img::new_from_pixbuf (rxvt_screen *s, GdkPixbuf *pb)
+{
+ Display *dpy = s->dpy;
+
+ int width = gdk_pixbuf_get_width (pb);
+ int height = gdk_pixbuf_get_height (pb);
+
+ if (width > 32767 || height > 32767) // well, we *could* upload in chunks
+ rxvt_fatal ("rxvt_img::new_from_pixbuf: image too big (maximum size 32768x32768).\n");
+
+ // since we require rgb24/argb32 formats from xrender we assume
+ // that both 24 and 32 bpp MUST be supported by any screen that supports xrender
+
+ int byte_order = ecb_big_endian () ? MSBFirst : LSBFirst;
+
+ XImage xi;
+
+ xi.width = width;
+ xi.height = height;
+ xi.xoffset = 0;
+ xi.format = ZPixmap;
+ xi.byte_order = ImageByteOrder (dpy);
+ xi.bitmap_unit = 0; //XY only, unused
+ xi.bitmap_bit_order = 0; //XY only, unused
+ xi.bitmap_pad = BitmapPad (dpy);
+ xi.depth = 32;
+ xi.bytes_per_line = 0;
+ xi.bits_per_pixel = 32; //Z only
+ xi.red_mask = 0x00000000; //Z only, unused
+ xi.green_mask = 0x00000000; //Z only, unused
+ xi.blue_mask = 0x00000000; //Z only, unused
+ xi.obdata = 0; // probably unused
+
+ bool byte_order_mismatch = byte_order != xi.byte_order;
+
+ if (!XInitImage (&xi))
+ rxvt_fatal ("unable to initialise ximage, please report.\n");
+
+ if (height > INT_MAX / xi.bytes_per_line)
+ rxvt_fatal ("rxvt_img::new_from_pixbuf: image too big for Xlib.\n");
+
+ xi.data = (char *)rxvt_malloc (height * xi.bytes_per_line);
+
+ int rowstride = gdk_pixbuf_get_rowstride (pb);
+ bool pb_has_alpha = gdk_pixbuf_get_has_alpha (pb);
+ unsigned char *row = gdk_pixbuf_get_pixels (pb);
+
+ char *line = xi.data;
+
+ for (int y = 0; y < height; y++)
+ {
+ unsigned char *src = row;
+ uint32_t *dst = (uint32_t *)line;
+
+ for (int x = 0; x < width; x++)
+ {
+ uint8_t r = *src++;
+ uint8_t g = *src++;
+ uint8_t b = *src++;
+ uint8_t a = *src;
+
+ // this is done so it can be jump-free, but newer gcc's clone inner the loop
+ a = pb_has_alpha ? a : 255;
+ src += pb_has_alpha;
+
+ r = (r * a + 127) / 255;
+ g = (g * a + 127) / 255;
+ b = (b * a + 127) / 255;
+
+ uint32_t v = (a << 24) | (r << 16) | (g << 8) | b;
+
+ if (ecb_big_endian () ? !byte_order_mismatch : byte_order_mismatch)
+ v = ecb_bswap32 (v);
+
+ *dst++ = v;
+ }
+
+ row += rowstride;
+ line += xi.bytes_per_line;
+ }
+
+ rxvt_img *img = new rxvt_img (s, XRenderFindStandardFormat (dpy, PictStandardARGB32), 0, 0, width, height);
+ img->alloc ();
+
+ GC gc = XCreateGC (dpy, img->pm, 0, 0);
+ XPutImage (dpy, img->pm, gc, &xi, 0, 0, 0, 0, width, height);
+ XFreeGC (dpy, gc);
+
+ free (xi.data);
+
+ return img;
+}
+
+rxvt_img *
+rxvt_img::new_from_file (rxvt_screen *s, const char *filename)
+{
+ GError *err = 0;
+ GdkPixbuf *pb = gdk_pixbuf_new_from_file (filename, &err);
+
+ if (!pb)
+ rxvt_fatal ("rxvt_img::new_from_file: %s\n", err->message);
+
+ rxvt_img *img = new_from_pixbuf (s, pb);
+
+ g_object_unref (pb);
+
+ return img;
+}
+
+# endif
+
+void
+rxvt_img::destroy ()
+{
+ if (--ref->cnt)
+ return;
+
+ if (pm && ref->ours)
+ XFreePixmap (d->dpy, pm);
+
+ delete ref;
+}
+
+rxvt_img::~rxvt_img ()
+{
+ destroy ();
+}
+
+void
+rxvt_img::alloc ()
+{
+ pm = XCreatePixmap (d->dpy, d->root, w, h, format->depth);
+ ref = new pixref (w, h);
+}
+
+rxvt_img *
+rxvt_img::new_empty ()
+{
+ rxvt_img *img = new rxvt_img (d, format, x, y, w, h, repeat);
+ img->alloc ();
+
+ return img;
+}
+
+Picture
+rxvt_img::picture ()
+{
+ Display *dpy = d->dpy;
+
+ XRenderPictureAttributes pa;
+ pa.repeat = repeat;
+ Picture pic = XRenderCreatePicture (dpy, pm, format, CPRepeat, &pa);
+
+ return pic;
+}
+
+void
+rxvt_img::unshare ()
+{
+ if (ref->cnt == 1 && ref->ours)
+ return;
+
+ Pixmap pm2 = XCreatePixmap (d->dpy, d->root, ref->w, ref->h, format->depth);
+ GC gc = XCreateGC (d->dpy, pm, 0, 0);
+ XCopyArea (d->dpy, pm, pm2, gc, 0, 0, ref->w, ref->h, 0, 0);
+ XFreeGC (d->dpy, gc);
+
+ destroy ();
+
+ pm = pm2;
+ ref = new pixref (ref->w, ref->h);
+}
+
+void
+rxvt_img::fill (const rgba &c, int x, int y, int w, int h)
+{
+ XRenderColor rc = { c.r, c.g, c.b, c.a };
+
+ Display *dpy = d->dpy;
+ Picture src = picture ();
+ XRenderFillRectangle (dpy, PictOpSrc, src, &rc, x, y, w, h);
+ XRenderFreePicture (dpy, src);
+}
+
+void
+rxvt_img::fill (const rgba &c)
+{
+ fill (c, 0, 0, w, h);
+}
+
+void
+rxvt_img::add_alpha ()
+{
+ if (format->direct.alphaMask)
+ return;
+
+ composer cc (this, new rxvt_img (d, find_alpha_format_for (d->dpy, format), x, y, w, h, repeat));
+
+ XRenderComposite (cc.dpy, PictOpSrc, cc.src, None, cc.dst, 0, 0, 0, 0, 0, 0, w, h);
+
+ rxvt_img *img = cc;
+
+ ::swap (img->ref, ref);
+ ::swap (img->pm , pm );
+
+ delete img;
+}
+
+static void
+get_gaussian_kernel (int radius, int width, nv *kernel, XFixed *params)
+{
+ nv sigma = radius / 2.0;
+ nv scale = sqrt (2.0 * M_PI) * sigma;
+ nv sum = 0.0;
+
+ for (int i = 0; i < width; i++)
+ {
+ nv x = i - width / 2;
+ kernel[i] = exp (-(x * x) / (2.0 * sigma * sigma)) / scale;
+ sum += kernel[i];
+ }
+
+ params[0] = XDoubleToFixed (width);
+ params[1] = XDoubleToFixed (1);
+
+ for (int i = 0; i < width; i++)
+ params[i+2] = XDoubleToFixed (kernel[i] / sum);
+}
+
+rxvt_img *
+rxvt_img::blur (int rh, int rv)
+{
+ if (!(d->flags & DISPLAY_HAS_RENDER_CONV))
+ return clone ();
+
+ Display *dpy = d->dpy;
+ int size = max (rh, rv) * 2 + 1;
+ nv *kernel = (nv *)malloc (size * sizeof (nv));
+ XFixed *params = rxvt_temp_buf<XFixed> (size + 2);
+ rxvt_img *img = new_empty ();
+
+ XRenderPictureAttributes pa;
+ pa.repeat = RepeatPad;
+ Picture src = XRenderCreatePicture (dpy, pm, format, CPRepeat, &pa);
+ Picture dst = XRenderCreatePicture (dpy, img->pm, format, 0, 0);
+
+ Pixmap tmp_pm = XCreatePixmap (dpy, pm, w, h, format->depth);
+ Picture tmp = XRenderCreatePicture (dpy, tmp_pm , format, CPRepeat, &pa);
+ XFreePixmap (dpy, tmp_pm);
+
+ if (kernel && params)
+ {
+ size = rh * 2 + 1;
+ get_gaussian_kernel (rh, size, kernel, params);
+
+ XRenderSetPictureFilter (dpy, src, FilterConvolution, params, size+2);
+ XRenderComposite (dpy,
+ PictOpSrc,
+ src,
+ None,
+ tmp,
+ 0, 0,
+ 0, 0,
+ 0, 0,
+ w, h);
+
+ size = rv * 2 + 1;
+ get_gaussian_kernel (rv, size, kernel, params);
+ ::swap (params[0], params[1]);
+
+ XRenderSetPictureFilter (dpy, tmp, FilterConvolution, params, size+2);
+ XRenderComposite (dpy,
+ PictOpSrc,
+ tmp,
+ None,
+ dst,
+ 0, 0,
+ 0, 0,
+ 0, 0,
+ w, h);
+ }
+
+ free (kernel);
+
+ XRenderFreePicture (dpy, src);
+ XRenderFreePicture (dpy, dst);
+ XRenderFreePicture (dpy, tmp);
+
+ return img;
+}
+
+rxvt_img *
+rxvt_img::muladd (nv mul, nv add)
+{
+ // STEP 1: double the image width, fill all odd columns with white (==1)
+
+ composer cc (this, new rxvt_img (d, format, 0, 0, w * 2, h, repeat));
+
+ // why the hell does XRenderSetPictureTransform want a writable matrix :(
+ // that keeps us from just static const'ing this matrix.
+ XTransform h_double = {
+ 0x08000, 0, 0,
+ 0, 0x10000, 0,
+ 0, 0, 0x10000
+ };
+
+ XRenderSetPictureFilter (cc.dpy, cc.src, "nearest", 0, 0);
+ XRenderSetPictureTransform (cc.dpy, cc.src, &h_double);
+ XRenderComposite (cc.dpy, PictOpSrc, cc.src, None, cc.dst, 0, 0, 0, 0, 0, 0, w * 2, h);
+
+ cc.mask (false, 2, 1);
+
+ static const XRenderColor c0 = { 0, 0, 0, 0 };
+ XRenderFillRectangle (cc.dpy, PictOpSrc, cc.msk, &c0, 0, 0, 1, 1);
+ static const XRenderColor c1 = { 65535, 65535, 65535, 65535 };
+ XRenderFillRectangle (cc.dpy, PictOpSrc, cc.msk, &c1, 1, 0, 1, 1);
+
+ Picture white = XRenderCreateSolidFill (cc.dpy, &c1);
+
+ XRenderComposite (cc.dpy, PictOpOver, white, cc.msk, cc.dst, 0, 0, 0, 0, 0, 0, w * 2, h);
+
+ XRenderFreePicture (cc.dpy, white);
+
+ // STEP 2: convolve the image with a 3x1 filter
+ // a 2x1 filter would obviously suffice, but given the total lack of specification
+ // for xrender, I expect different xrender implementations to randomly diverge.
+ // we also halve the image, and hope for the best (again, for lack of specs).
+ composer cc2 (cc.dstimg);
+
+ XFixed kernel [] = {
+ XDoubleToFixed (3), XDoubleToFixed (1),
+ XDoubleToFixed (0), XDoubleToFixed (mul), XDoubleToFixed (add)
+ };
+
+ XTransform h_halve = {
+ 0x20000, 0, 0,
+ 0, 0x10000, 0,
+ 0, 0, 0x10000
+ };
+
+ XRenderSetPictureFilter (cc.dpy, cc2.src, "nearest", 0, 0);
+ XRenderSetPictureTransform (cc.dpy, cc2.src, &h_halve);
+ XRenderSetPictureFilter (cc.dpy, cc2.src, FilterConvolution, kernel, ecb_array_length (kernel));
+
+ XRenderComposite (cc.dpy, PictOpSrc, cc2.src, None, cc2.dst, 0, 0, 0, 0, 0, 0, w * 2, h);
+
+ return cc2;
+}
+
+ecb_noinline static void
+extract (int32_t cl0, int32_t cl1, int32_t &c, unsigned short &xc)
+{
+ int32_t x = clamp (c, cl0, cl1);
+ c -= x;
+ xc = x;
+}
+
+ecb_noinline static bool
+extract (int32_t cl0, int32_t cl1, int32_t &r, int32_t &g, int32_t &b, int32_t &a, unsigned short &xr, unsigned short &xg, unsigned short &xb, unsigned short &xa)
+{
+ extract (cl0, cl1, r, xr);
+ extract (cl0, cl1, g, xg);
+ extract (cl0, cl1, b, xb);
+ extract (cl0, cl1, a, xa);
+
+ return xr | xg | xb | xa;
+}
+
+void
+rxvt_img::brightness (int32_t r, int32_t g, int32_t b, int32_t a)
+{
+ unshare ();
+
+ Display *dpy = d->dpy;
+ Picture dst = XRenderCreatePicture (dpy, pm, format, 0, 0);
+
+ // loop should not be needed for brightness, as only -1..1 makes sense
+ //while (r | g | b | a)
+ {
+ unsigned short xr, xg, xb, xa;
+ XRenderColor mask_c;
+
+ if (extract (0, 65535, r, g, b, a, mask_c.red, mask_c.green, mask_c.blue, mask_c.alpha))
+ XRenderFillRectangle (dpy, PictOpAdd, dst, &mask_c, 0, 0, w, h);
+
+ if (extract (-65535, 0, r, g, b, a, mask_c.red, mask_c.green, mask_c.blue, mask_c.alpha))
+ {
+ XRenderColor mask_w = { 65535, 65535, 65535, 65535 };
+ XRenderFillRectangle (dpy, PictOpDifference, dst, &mask_w, 0, 0, w, h);
+ mask_c.red = -mask_c.red; //TODO: verify that doing clamp, assign, and negation does the right thing
+ mask_c.green = -mask_c.green;
+ mask_c.blue = -mask_c.blue;
+ mask_c.alpha = -mask_c.alpha;
+ XRenderFillRectangle (dpy, PictOpAdd, dst, &mask_c, 0, 0, w, h);
+ XRenderFillRectangle (dpy, PictOpDifference, dst, &mask_w, 0, 0, w, h);
+ }
+ }
+
+ XRenderFreePicture (dpy, dst);
+}
+
+void
+rxvt_img::contrast (int32_t r, int32_t g, int32_t b, int32_t a)
+{
+ if (r < 0 || g < 0 || b < 0 || a < 0)
+ rxvt_fatal ("rxvt_img::contrast does not support negative values.\n");
+
+ // premultiply (yeah, these are not exact, sue me or fix it)
+ r = (r * (a >> 8)) >> 8;
+ g = (g * (a >> 8)) >> 8;
+ b = (b * (a >> 8)) >> 8;
+
+ composer cc (this);
+ rxvt_img *img = cc;
+ img->fill (rgba (0, 0, 0, 0));
+
+ cc.mask (true);
+
+ //TODO: this operator does not yet implement some useful contrast
+ while (r | g | b | a)
+ {
+ unsigned short xr, xg, xb, xa;
+ XRenderColor mask_c;
+
+ if (extract (0, 65535, r, g, b, a, mask_c.red, mask_c.green, mask_c.blue, mask_c.alpha))
+ {
+ XRenderFillRectangle (cc.dpy, PictOpSrc, cc.msk, &mask_c, 0, 0, 1, 1);
+ XRenderComposite (cc.dpy, PictOpAdd, cc.src, cc.msk, cc.dst, 0, 0, 0, 0, 0, 0, w, h);
+ }
+ }
+
+ ::swap (img->ref, ref);
+ ::swap (img->pm , pm );
+
+ delete img;
+}
+
+void
+rxvt_img::draw (rxvt_img *img, int op, nv mask)
+{
+ unshare ();
+
+ composer cc (img, this);
+
+ if (mask != 1.)
+ cc.mask (rgba (0, 0, 0, float_to_component (mask)));
+
+ XRenderComposite (cc.dpy, op, cc.src, cc.msk, cc.dst, x - img->x, y - img->y, 0, 0, 0, 0, w, h);
+}
+
+rxvt_img *
+rxvt_img::clone ()
+{
+ return new rxvt_img (*this);
+}
+
+rxvt_img *
+rxvt_img::reify ()
+{
+ if (x == 0 && y == 0 && w == ref->w && h == ref->h)
+ return clone ();
+
+ // add an alpha channel if...
+ bool alpha = !format->direct.alphaMask // pixmap has none yet
+ && (x || y) // we need one because of non-zero offset
+ && repeat == RepeatNone; // and we have no good pixels to fill with
+
+ composer cc (this, new rxvt_img (d, alpha ? find_alpha_format_for (d->dpy, format) : format,
+ 0, 0, w, h, repeat));
+
+ if (repeat == RepeatNone)
+ {
+ XRenderColor rc = { 0, 0, 0, 0 };
+ XRenderFillRectangle (cc.dpy, PictOpSrc, cc.dst, &rc, 0, 0, w, h);//TODO: split into four fillrectangles
+ XRenderComposite (cc.dpy, PictOpSrc, cc.src, None, cc.dst, 0, 0, 0, 0, x, y, ref->w, ref->h);
+ }
+ else
+ XRenderComposite (cc.dpy, PictOpSrc, cc.src, None, cc.dst, -x, -y, 0, 0, 0, 0, w, h);
+
+ return cc;
+}
+
+rxvt_img *
+rxvt_img::sub_rect (int x, int y, int width, int height)
+{
+ rxvt_img *img = clone ();
+
+ img->x -= x;
+ img->y -= y;
+
+ if (w != width || h != height)
+ {
+ img->w = width;
+ img->h = height;
+
+ rxvt_img *img2 = img->reify ();
+ delete img;
+ img = img2;
+ }
+
+ return img;
+}
+
+rxvt_img *
+rxvt_img::transform (const nv matrix[3][3])
+{
+ return transform (mat3x3 (&matrix[0][0]));
+}
+
+rxvt_img *
+rxvt_img::transform (const nv *matrix)
+{
+ mat3x3 m (matrix);
+
+ // calculate new pixel bounding box coordinates
+ nv rmin[2], rmax[2];
+
+ for (int i = 0; i < 2; ++i)
+ {
+ nv v;
+
+ v = m.apply1 (i, 0+x, 0+y); rmin [i] = rmax [i] = v;
+ v = m.apply1 (i, w+x, 0+y); min_it (rmin [i], v); max_it (rmax [i], v);
+ v = m.apply1 (i, 0+x, h+y); min_it (rmin [i], v); max_it (rmax [i], v);
+ v = m.apply1 (i, w+x, h+y); min_it (rmin [i], v); max_it (rmax [i], v);
+ }
+
+ float sx = rmin [0] - x;
+ float sy = rmin [1] - y;
+
+ // TODO: adjust matrix for subpixel accuracy
+ int nx = floor (rmin [0]);
+ int ny = floor (rmin [1]);
+
+ int new_width = ceil (rmax [0] - rmin [0]);
+ int new_height = ceil (rmax [1] - rmin [1]);
+
+ mat3x3 inv = (mat3x3::translate (-x, -y) * m * mat3x3::translate (x, y)).inverse ();
+
+ composer cc (this, new rxvt_img (d, format, nx, ny, new_width, new_height, repeat));
+
+ XTransform xfrm;
+
+ for (int i = 0; i < 3; ++i)
+ for (int j = 0; j < 3; ++j)
+ xfrm.matrix [i][j] = XDoubleToFixed (inv [i][j]);
+
+ XRenderSetPictureFilter (cc.dpy, cc.src, "good", 0, 0);
+ XRenderSetPictureTransform (cc.dpy, cc.src, &xfrm);
+ XRenderComposite (cc.dpy, PictOpSrc, cc.src, None, cc.dst, sx, sy, 0, 0, 0, 0, new_width, new_height);
+
+ return cc;
+}
+
+rxvt_img *
+rxvt_img::scale (int new_width, int new_height)
+{
+ if (w == new_width && h == new_height)
+ return clone ();
+
+ int old_repeat_mode = repeat;
+ repeat = RepeatPad; // not right, but xrender can't properly scale it seems
+
+ rxvt_img *img = transform (mat3x3::scale (new_width / (nv)w, new_height / (nv)h));
+
+ repeat = old_repeat_mode;
+ img->repeat = repeat;
+
+ return img;
+}
+
+rxvt_img *
+rxvt_img::rotate (int cx, int cy, nv phi)
+{
+ move (-cx, -cy);
+ rxvt_img *img = transform (mat3x3::rotate (phi));
+ move ( cx, cy);
+ img->move (cx, cy);
+
+ return img;
+}
+
+rxvt_img *
+rxvt_img::convert_format (XRenderPictFormat *new_format, const rgba &bg)
+{
+ if (new_format == format)
+ return clone ();
+
+ composer cc (this, new rxvt_img (d, new_format, x, y, w, h, repeat));
+
+ int op = PictOpSrc;
+
+ if (format->direct.alphaMask && !new_format->direct.alphaMask)
+ {
+ // does it have to be that complicated
+ XRenderColor rc = { bg.r, bg.g, bg.b, bg.a };
+ XRenderFillRectangle (cc.dpy, PictOpSrc, cc.dst, &rc, 0, 0, w, h);
+
+ op = PictOpOver;
+ }
+
+ XRenderComposite (cc.dpy, op, cc.src, None, cc.dst, 0, 0, 0, 0, 0, 0, w, h);
+
+ return cc;
+}
+
+rxvt_img *
+rxvt_img::tint (const rgba &c)
+{
+ composer cc (this);
+ cc.mask (true);
+ cc.fill (c);
+
+ XRenderComposite (cc.dpy, PictOpSrc, cc.src, cc.msk, cc.dst, 0, 0, 0, 0, 0, 0, w, h);
+
+ return cc;
+}
+
+rxvt_img *
+rxvt_img::shade (nv factor, rgba c)
+{
+ clamp_it (factor, -1., 1.);
+ factor++;
+
+ if (factor > 1)
+ {
+ c.r = c.r * (2 - factor);
+ c.g = c.g * (2 - factor);
+ c.b = c.b * (2 - factor);
+ }
+ else
+ {
+ c.r = c.r * factor;
+ c.g = c.g * factor;
+ c.b = c.b * factor;
+ }
+
+ rxvt_img *img = this->tint (c);
+
+ if (factor > 1)
+ {
+ c.a = 0xffff;
+ c.r =
+ c.g =
+ c.b = 0xffff * (factor - 1);
+
+ img->brightness (c.r, c.g, c.b, c.a);
+ }
+
+ return img;
+}
+
+rxvt_img *
+rxvt_img::filter (const char *name, int nparams, nv *params)
+{
+ composer cc (this);
+
+ XFixed *xparams = rxvt_temp_buf<XFixed> (nparams);
+
+ for (int i = 0; i < nparams; ++i)
+ xparams [i] = XDoubleToFixed (params [i]);
+
+ XRenderSetPictureFilter (cc.dpy, cc.src, name, xparams, nparams);
+
+ XRenderComposite (cc.dpy, PictOpSrc, cc.src, 0, cc.dst, 0, 0, 0, 0, 0, 0, w, h);
+
+ return cc;
+}
+
+#endif
+
diff --git a/src/rxvtimg.h b/src/rxvtimg.h
new file mode 100644
index 0000000..d4c7eea
--- /dev/null
+++ b/src/rxvtimg.h
@@ -0,0 +1,152 @@
+/*----------------------------------------------------------------------*
+ * File: rxvtimg.h
+ *----------------------------------------------------------------------*
+ *
+ * All portions of code are copyright by their respective author/s.
+ * Copyright (c) 2012 Marc Lehmann <schmorp@schmorp.de>
+ * Copyright (c) 2012 Emanuele Giaquinta <e.giaquinta@glauco.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *---------------------------------------------------------------------*/
+
+#ifndef IMG_H
+#define IMG_H
+
+#if HAVE_IMG
+
+#define float_to_component(d) (int32_t)((d) * 65535.99)
+
+#include <X11/extensions/Xrender.h>
+
+struct rxvt_img
+{
+ typedef double nv;
+
+ // *could* also hold the Pixmap itself
+ struct pixref
+ {
+ int cnt;
+ int w, h;
+ bool ours; // false if we don't own the pixmap at all
+
+ pixref (int w, int h)
+ : cnt(1), w(w), h(h), ours(true)
+ {
+ }
+ };
+
+ rxvt_display *d;
+ Pixmap pm;
+ pixref *ref; // shared refcnt
+ int x, y, w, h, repeat;
+ XRenderPictFormat *format;
+
+ rxvt_img (rxvt_screen *screen, XRenderPictFormat *format, int x, int y, int width, int height, int repeat = RepeatNormal);
+ rxvt_img (rxvt_display *display, XRenderPictFormat *format, int x, int y, int width, int height, int repeat = RepeatNormal);
+ rxvt_img (const rxvt_img &img);
+ void alloc ();
+
+# if HAVE_PIXBUF
+ static rxvt_img *new_from_pixbuf (rxvt_screen *s, GdkPixbuf *pb); // from pixbuf
+ static rxvt_img *new_from_file (rxvt_screen *s, const char *filename); // via pixbuf
+# endif
+ static rxvt_img *new_from_root (rxvt_screen *s); // get root pixmap
+
+ ~rxvt_img ();
+
+ Pixmap steal ()
+ {
+ ref->ours = false;
+ return pm;
+ }
+
+ // inplace
+ void move (int dx, int dy)
+ {
+ x += dx;
+ y += dy;
+ }
+
+ void repeat_mode (int repeat)
+ {
+ this->repeat = repeat;
+ }
+
+ void unshare (); // prepare for write
+ void fill (const rgba &c);
+ void fill (const rgba &c, int x, int y, int w, int h);
+ void add_alpha ();
+ //void linear_gradient (const XLinearGradient *gradient, const XFixed *stops, const XRenderColor *colors, int nstops);
+ //void radial_gradient (const XRadialGradient *gradient, const XFixed *stops, const XRenderColor *colors, int nstops);
+ //void conical_gradient (const XConicalGradient *gradient, const XFixed *stops, const XRenderColor *colors, int nstops);
+
+ void brightness (int32_t r, int32_t g, int32_t b, int32_t a);
+ void contrast (int32_t r, int32_t g, int32_t b, int32_t a);
+
+ void brightness (nv r, nv g, nv b, nv a = 1.)
+ {
+ brightness (float_to_component (r),
+ float_to_component (g),
+ float_to_component (b),
+ float_to_component (a));
+ }
+
+ void contrast (nv r, nv g, nv b, nv a = 1.)
+ {
+ contrast (float_to_component (r),
+ float_to_component (g),
+ float_to_component (b),
+ float_to_component (a));
+ }
+
+ void draw (rxvt_img *img, int op = PictOpOver, nv mask = 1.);
+#if 0
+ void draw (rxvt_img *img, int op = PictOpOver, nv mask = 1.,
+ nv px, nv py, nv qx, nv qy, nv rx, nv ry, nv sx, nv sy);
+#endif
+
+ // copy
+ rxvt_img *reify (); // make x, y 0, make real width/height
+ rxvt_img *blur (int rh, int rv);
+ rxvt_img *clone ();
+ rxvt_img *sub_rect (int x, int y, int width, int height);
+ rxvt_img *transform (const nv matrix[3][3]);
+ rxvt_img *scale (int new_width, int new_height);
+ rxvt_img *rotate (int cx, int cy, nv phi);
+ rxvt_img *convert_format (XRenderPictFormat *format, const rgba &bg);
+ rxvt_img *tint (const rgba &c);
+ rxvt_img *shade (nv factor, rgba c = rgba (rgba::MAX_CC, rgba::MAX_CC, rgba::MAX_CC));
+ rxvt_img *filter (const char *name, int nparams = 0, nv *params = 0);
+ rxvt_img *muladd (nv mul, nv add); // general multiply and add, implemented as the biggest hack ever :/
+
+ // egregious helper category
+ rxvt_img *replace (rxvt_img *&p)
+ {
+ delete p;
+ p = this;
+ return this;
+ }
+
+ /* these are considered private */
+ void destroy ();
+ rxvt_img *new_empty ();
+ Picture picture ();
+ rxvt_img *transform (const nv *matrix);
+};
+
+#endif
+
+#endif
+
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