handle objbbox coordinate space for linear gradients, start of handling for radial

6 files changed, 300 insertions, 56 deletions

diff --git a/ChangeLog b/ChangeLog
index ca1b2af4..a9192e16 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2003-01-29  Dom Lachowicz <cinamod@hotmail.com>
 
+	* rsvg-paint-server.[ch]: Handle objectBoundingBox units for linear gradients, radialGradients. Radial are untested and do not work properly.
+	* rsvg.c: Query the gradientUnits param, in order to pass to ^^^
+	* TODO: Update info so that the objectBoundingBox gets handled properly in case of percentage values.
+	* tests/obj_bbox.svg: Test for the above
+
+2003-01-29  Dom Lachowicz <cinamod@hotmail.com>
+
 	* rsvg-gz.c: Fix build
 	* rsvg-file-util.c: Remove GNOME VFS code.
 	
diff --git a/TODO b/TODO
index ff2d9551..f45f5782 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,7 @@
 TODO:
 
+ * Handle percentages correctly for gradients in objectBoundingBox space
+
  * Clipping paths
 
  * Masks
@@ -15,7 +17,4 @@ TODO:
 
 On the back burner:
 
- * Consider storing the paths so that the file can be rerendered
-   multiple times without reparsing.
-
  * Make error messages translatable (requires adding gettext).
diff --git a/rsvg-paint-server.c b/rsvg-paint-server.c
index aec05329..ba908128 100644
--- a/rsvg-paint-server.c
+++ b/rsvg-paint-server.c
@@ -145,8 +145,21 @@ rsvg_paint_server_lin_grad_render (RsvgPaintServer *self, ArtRender *ar,
 	RsvgLinearGradient *rlg = z->gradient;
 	ArtGradientLinear *agl;
 	double x1, y1, x2, y2;
+	double g_x1, g_y1, g_x2, g_y2;
 	double dx, dy, scale;
 	
+	g_x1 = rlg->x1;
+	g_x2 = rlg->x2;
+	g_y1 = rlg->y1;
+	g_y2 = rlg->y2;
+
+	if (rlg->obj_bbox == TRUE) {
+		g_x1 *= ar->x0;
+		g_x2 *= ar->x1;
+		g_y1 *= ar->y0;
+		g_y2 *= ar->y1;
+	}
+
 	agl = z->agl;
 	if (agl == NULL)
 		{
@@ -161,11 +174,10 @@ rsvg_paint_server_lin_grad_render (RsvgPaintServer *self, ArtRender *ar,
 		}
 	
 	/* compute [xy][12] in pixel space */
-	/* todo: this code implicitly implements gradientUnits = userSpace */
-	x1 = rlg->x1 * rlg->affine[0] + rlg->y1 * rlg->affine[2] + rlg->affine[4];
-	y1 = rlg->x1 * rlg->affine[1] + rlg->y1 * rlg->affine[3] + rlg->affine[5];
-	x2 = rlg->x2 * rlg->affine[0] + rlg->y2 * rlg->affine[2] + rlg->affine[4];
-	y2 = rlg->x2 * rlg->affine[1] + rlg->y2 * rlg->affine[3] + rlg->affine[5];
+	x1 = g_x1 * rlg->affine[0] + g_y1 * rlg->affine[2] + rlg->affine[4];
+	y1 = g_x1 * rlg->affine[1] + g_y1 * rlg->affine[3] + rlg->affine[5];
+	x2 = g_x2 * rlg->affine[0] + g_y2 * rlg->affine[2] + rlg->affine[4];
+	y2 = g_x2 * rlg->affine[1] + g_y2 * rlg->affine[3] + rlg->affine[5];
 	
 	/* solve a, b, c so ax1 + by1 + c = 0 and ax2 + by2 + c = 1, maximum
 	   gradient is in x1,y1 to x2,y2 dir */
@@ -215,6 +227,27 @@ rsvg_paint_server_rad_grad_render (RsvgPaintServer *self, ArtRender *ar,
 	ArtGradientRadial *agr;
 	double aff1[6], aff2[6];
 	
+	double r, cx, cy, fx, fy;
+
+	r  = rrg->r;
+	cx = rrg->cx;
+	cy = rrg->cy;
+	fx = rrg->fx;
+	fy = rrg->fy;
+
+	if (rrg->obj_bbox) {
+		/* http://www.w3.org/TR/SVG11/pservers.html#RadialGradientUnitsAttribute 
+		   not quite sure of the math needed here in order to make this happen
+		   relative to [ar->x0 ar->x1 ar->y0 ar->y1]
+		*/
+		/* todo: untested, known to be *quite* broken */
+		r  *= (((ar->x1 - ar->x0) + (ar->y1 - ar->y0)) / 2.);
+		cx *= ((ar->x1 - ar->x0));
+		cy *= ((ar->y1 - ar->y0));
+		fx *= ((ar->x1 - ar->x0));
+		fy *= ((ar->y1 - ar->y0));
+	}
+
 	agr = z->agr;
 	if (agr == NULL)
 		{
@@ -228,17 +261,16 @@ rsvg_paint_server_rad_grad_render (RsvgPaintServer *self, ArtRender *ar,
 			z->agr = agr;
 		}
 	
-	/* todo: this code implicitly implements gradientUnits = userSpace */
-	art_affine_scale (aff1, rrg->r, rrg->r);
-	art_affine_translate (aff2, rrg->cx, rrg->cy);
+	art_affine_scale (aff1, r, r);
+	art_affine_translate (aff2, cx, cy);
 	art_affine_multiply (aff1, aff1, aff2);
 	art_affine_multiply (aff1, aff1, rrg->affine);
 	art_affine_invert (agr->affine, aff1);
 	
-	/* TODO: libart doesn't support spreads on radial gradients */
+	/* todo: libart doesn't support spreads on radial gradients */
 
-	agr->fx = (rrg->fx - rrg->cx) / rrg->r;
-	agr->fy = (rrg->fy - rrg->cy) / rrg->r;
+	agr->fx = (fx - cx) / r;
+	agr->fy = (fy - cy) / r;
 	
 	art_render_gradient_radial (ar, agr, ART_FILTER_NEAREST);
 }
@@ -363,6 +395,7 @@ rsvg_clone_radial_gradient (const RsvgRadialGradient *grad, gboolean * shallow_c
 	clone->super.type = RSVG_DEF_RADGRAD;
 	clone->super.free = rsvg_radial_gradient_free;
 	
+	clone->obj_bbox = grad->obj_bbox;
 	for (i = 0; i < 6; i++)
 		clone->affine[i] = grad->affine[i];
 
@@ -373,13 +406,11 @@ rsvg_clone_radial_gradient (const RsvgRadialGradient *grad, gboolean * shallow_c
 	
 		for (i = 0; i < grad->stops->n_stop; i++)
 			clone->stops->stop[i] = grad->stops->stop[i];
-	} else {
-		clone->stops = NULL;
 	}
 
 	clone->spread = grad->spread;
 
-	/* EVIL EVIL - sodipodi can base LinearGradients on
+	/* EVIL EVIL - SVG can base LinearGradients on
 	   RadialGradients, and vice-versa. it is legal, though:
 	   http://www.w3.org/TR/SVG11/pservers.html#LinearGradients
 	*/
@@ -408,6 +439,7 @@ rsvg_clone_linear_gradient (const RsvgLinearGradient *grad, gboolean * shallow_c
 	clone->super.type = RSVG_DEF_LINGRAD;
 	clone->super.free = rsvg_linear_gradient_free;
 	
+	clone->obj_bbox = grad->obj_bbox;
 	for (i = 0; i < 6; i++)
 		clone->affine[i] = grad->affine[i];
 
@@ -418,13 +450,11 @@ rsvg_clone_linear_gradient (const RsvgLinearGradient *grad, gboolean * shallow_c
 		
 		for (i = 0; i < grad->stops->n_stop; i++)
 			clone->stops->stop[i] = grad->stops->stop[i];
-	} else {
-		clone->stops = NULL;
 	}
 
 	clone->spread = grad->spread;
 
-	/* EVIL EVIL - sodipodi can base LinearGradients on
+	/* EVIL EVIL - SVG can base LinearGradients on
 	   RadialGradients, and vice-versa. it is legal, though:
 	   http://www.w3.org/TR/SVG11/pservers.html#LinearGradients
 	*/
diff --git a/rsvg-paint-server.h b/rsvg-paint-server.h
index 899de23a..50c1e008 100644
--- a/rsvg-paint-server.h
+++ b/rsvg-paint-server.h
@@ -42,48 +42,50 @@ typedef struct _RsvgPaintServer RsvgPaintServer;
 typedef struct _RsvgPSCtx RsvgPSCtx;
 
 struct _RsvgPSCtx {
-  int dummy;
-/* todo: we need to take in some context information, including:
-
-   1. The global affine transformation.
-
-   2. User coordinates at time of reference (to implement
-   gradientUnits = "userSpaceOnUse").
-
-   3. Object bounding box (to implement gradientUnits =
-   "objectBoundingBox").
-
-   Maybe signal for lazy evaluation of object bbox.
-*/
+	int dummy;
+	/* todo: we need to take in some context information, including:
+	   
+	1. The global affine transformation.
+	
+	2. User coordinates at time of reference (to implement
+	gradientUnits = "userSpaceOnUse").
+	
+	3. Object bounding box (to implement gradientUnits =
+	"objectBoundingBox").
+	
+	Maybe signal for lazy evaluation of object bbox.
+	*/
 };
 
 struct _RsvgGradientStop {
-  double offset;
-  guint32 rgba;
+	double offset;
+	guint32 rgba;
 };
 
 struct _RsvgGradientStops {
-  int n_stop;
-  RsvgGradientStop *stop;
+	int n_stop;
+	RsvgGradientStop *stop;
 };
 
 struct _RsvgLinearGradient {
-  RsvgDefVal super;
-  double affine[6]; /* user space to actual at time of gradient def */
-  RsvgGradientStops *stops;
-  ArtGradientSpread spread;
-  double x1, y1;
-  double x2, y2;
+	RsvgDefVal super;
+	gboolean obj_bbox;
+	double affine[6]; /* user space to actual at time of gradient def */
+	RsvgGradientStops *stops;
+	ArtGradientSpread spread;
+	double x1, y1;
+	double x2, y2;
 };
 
 struct _RsvgRadialGradient {
-  RsvgDefVal super;
-  double affine[6]; /* user space to actual at time of gradient def */
-  RsvgGradientStops *stops;
-  ArtGradientSpread spread;
-  double cx, cy;
-  double r;
-  double fx, fy;
+	RsvgDefVal super;
+	gboolean obj_bbox;
+	double affine[6]; /* user space to actual at time of gradient def */
+	RsvgGradientStops *stops;
+	ArtGradientSpread spread;
+	double cx, cy;
+	double r;
+	double fx, fy;
 };
 
 /* Create a new paint server based on a specification string. */
@@ -92,7 +94,7 @@ rsvg_paint_server_parse (const RsvgDefs *defs, const char *str);
 
 void
 rsvg_render_paint_server (ArtRender *ar, RsvgPaintServer *ps,
-			  const RsvgPSCtx *ctx);
+						  const RsvgPSCtx *ctx);
 
 void
 rsvg_paint_server_ref (RsvgPaintServer *ps);
diff --git a/rsvg.c b/rsvg.c
index 9f3a671c..93c97323 100644
--- a/rsvg.c
+++ b/rsvg.c
@@ -403,10 +403,11 @@ rsvg_start_linear_gradient (RsvgHandle *ctx, const xmlChar **atts)
 	double x1 = 0., y1 = 0., x2 = 0., y2 = 0.;
 	ArtGradientSpread spread = ART_GRADIENT_PAD;
 	const char * xlink_href = NULL;
-	gboolean got_x1, got_x2, got_y1, got_y2, got_spread, got_transform, cloned, shallow_cloned;
+	gboolean obj_bbox = TRUE;
+	gboolean got_x1, got_x2, got_y1, got_y2, got_spread, got_transform, got_bbox, cloned, shallow_cloned;
 	double affine[6];
 
-	got_x1 = got_x2 = got_y1 = got_y2 = got_spread = got_transform = cloned = shallow_cloned = FALSE;
+	got_x1 = got_x2 = got_y1 = got_y2 = got_spread = got_transform = got_bbox = cloned = shallow_cloned = FALSE;
 	
 	/* 100% is the default */
 	x2 = rsvg_css_parse_normalized_length ("100%", ctx->dpi, (gdouble)ctx->width, state->font_size);
@@ -451,8 +452,11 @@ rsvg_start_linear_gradient (RsvgHandle *ctx, const xmlChar **atts)
 						}
 					else if (!strcmp ((char *)atts[i], "xlink:href"))
 						xlink_href = (const char *)atts[i + 1];
-					else if (!strcmp ((char *)atts[i], "gradientTransform")) {
+					else if (!strcmp ((char *)atts[i], "gradientTransform"))
 						got_transform = rsvg_parse_transform (affine, (const char *)atts[i + 1]);
+					else if (!strcmp ((char *)atts[i], "gradientUnits")) {
+						obj_bbox = (strcmp ((char *)atts[i+1], "objectBoundingBox") == 0);
+						got_bbox = TRUE;
 					}
 				}
 		}
@@ -485,6 +489,7 @@ rsvg_start_linear_gradient (RsvgHandle *ctx, const xmlChar **atts)
 		art_affine_multiply (grad->affine, affine, grad->affine);
 	
 	/* state inherits parent/cloned information unless it's explicity gotten */
+	grad->obj_bbox = (cloned && !got_bbox) ? grad->obj_bbox : obj_bbox;
 	grad->x1 = (cloned && !got_x1) ? grad->x1 : x1;
 	grad->y1 = (cloned && !got_y1) ? grad->y1 : y1;
 	grad->x2 = (cloned && !got_x2) ? grad->x2 : x2;
@@ -513,10 +518,11 @@ rsvg_start_radial_gradient (RsvgHandle *ctx, const xmlChar **atts, const char *
 	double cx = 0., cy = 0., r = 0., fx = 0., fy = 0.;  
 	const char * xlink_href = NULL;
 	ArtGradientSpread spread = ART_GRADIENT_PAD;
-	gboolean got_cx, got_cy, got_r, got_fx, got_fy, got_spread, got_transform, cloned, shallow_cloned;
+	gboolean obj_bbox = TRUE;
+	gboolean got_cx, got_cy, got_r, got_fx, got_fy, got_spread, got_transform, got_bbox, cloned, shallow_cloned;
 	double affine[6];
 	
-	got_cx = got_cy = got_r = got_fx = got_fy = got_spread = got_transform = cloned = shallow_cloned = FALSE;
+	got_cx = got_cy = got_r = got_fx = got_fy = got_spread = got_transform = got_bbox = cloned = shallow_cloned = FALSE;
 	
 	/* setup defaults */
 	cx = rsvg_css_parse_normalized_length ("50%", ctx->dpi, (gdouble)ctx->width, state->font_size);
@@ -572,6 +578,10 @@ rsvg_start_radial_gradient (RsvgHandle *ctx, const xmlChar **atts, const char *
 								got_spread = TRUE;
 							}
 						}
+					else if (!strcmp ((char *)atts[i], "gradientUnits")) {
+						obj_bbox = (strcmp ((char *)atts[i+1], "objectBoundingBox") == 0);
+						got_bbox = TRUE;
+					}
 				}
 		}
 	
@@ -613,6 +623,7 @@ rsvg_start_radial_gradient (RsvgHandle *ctx, const xmlChar **atts, const char *
 		art_affine_multiply (grad->affine, affine, grad->affine);
 	
 	/* state inherits parent/cloned information unless it's explicity gotten */
+	grad->obj_bbox = (cloned && !got_bbox) ? grad->obj_bbox : obj_bbox;
 	grad->cx = (cloned && !got_cx) ? grad->cx : cx;
 	grad->cy = (cloned && !got_cy) ? grad->cy : cy;
 	grad->r =  (cloned && !got_r)  ? grad->r  : r;
diff --git a/tests/obj_bbox.svg b/tests/obj_bbox.svg
new file mode 100644
index 00000000..3d1ec865
--- /dev/null
+++ b/tests/obj_bbox.svg
@@ -0,0 +1,195 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
+"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"
+[
+ <!ATTLIST svg
+  xmlns:xlink CDATA #FIXED "http://www.w3.org/1999/xlink">
+]>
+<!-- Created with Sodipodi ("http://www.sodipodi.com/") -->
+<svg
+   xml:space="preserve"
+   width="282.773pt"
+   height="191.899pt"
+   viewBox="0 0 282.773 191.899"
+   id="svg170"
+   sodipodi:version="0.28"
+   sodipodi:docname="bbox.svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink">
+  <defs
+     id="defs194">
+    <linearGradient
+       id="aigrd2"
+       gradientUnits="userSpaceOnUse"
+       x1="127.7222"
+       y1="99.6226"
+       x2="156.019"
+       y2="172.1655">
+      <stop
+         offset="0"
+         style="stop-color:#DEDFCE"
+         id="stop183" />
+      <stop
+         offset="1"
+         style="stop-color:#C2C4B5"
+         id="stop184" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient200">
+      <stop
+         style="stop-color:#000000;stop-opacity:1;"
+         offset="0.000000"
+         id="stop201" />
+      <stop
+         style="stop-color:#000000;stop-opacity:0;"
+         offset="1.000000"
+         id="stop202" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient196">
+      <stop
+         style="stop-color:#000;stop-opacity:1;"
+         offset="0"
+         id="stop197" />
+      <stop
+         style="stop-color:#fff;stop-opacity:1;"
+         offset="1"
+         id="stop198" />
+    </linearGradient>
+    <radialGradient
+       xlink:href="#linearGradient200"
+       id="radialGradient199"
+       cx="0.5"
+       cy="0.499997"
+       fx="0.5"
+       fy="0.499997"
+       r="0.5"
+       gradientUnits="objectBoundingBox"
+       gradientTransform="matrix(1,0,0,0.999999,-2.21187e-08,7.38927e-09)"
+       spreadMethod="pad" />
+    <linearGradient
+       id="aigrd1"
+       gradientUnits="userSpaceOnUse"
+       x1="174.9414"
+       y1="27.7495"
+       x2="138.2552"
+       y2="126.017">
+      <stop
+         offset="0"
+         style="stop-color:#989C80"
+         id="stop176" />
+      <stop
+         offset="1"
+         style="stop-color:#000000"
+         id="stop177" />
+    </linearGradient>
+    <linearGradient
+       id="aigrd3"
+       gradientUnits="userSpaceOnUse"
+       x1="92.187"
+       y1="73.4146"
+       x2="105.9913"
+       y2="122.4433">
+      <stop
+         offset="0"
+         style="stop-color:#DEDFCE"
+         id="stop187" />
+      <stop
+         offset="1"
+         style="stop-color:#FFFFFF"
+         id="stop188" />
+    </linearGradient>
+    <radialGradient
+       cx="0.5"
+       cy="0.5"
+       r="0.5"
+       fx="0.5"
+       fy="0.5"
+       xlink:href="#linearGradient196"
+       id="radialGradient34"
+       gradientUnits="objectBoundingBox"
+       gradientTransform="matrix(1,-2.45197e-08,-8.30791e-10,1,1.2663e-08,-3.59631e-08)"
+       spreadMethod="pad" />
+    <linearGradient
+       xlink:href="#linearGradient196"
+       id="linearGradient35"
+       x1="1.44999e-08"
+       y1="-7.76244e-09"
+       x2="1"
+       y2="-7.76244e-09"
+       gradientUnits="objectBoundingBox"
+       gradientTransform="matrix(1,-1.6501e-08,-3.69181e-10,1,3.47773e-09,-1.04109e-09)"
+       spreadMethod="pad" />
+  </defs>
+  <sodipodi:namedview
+     id="base" />
+  <rect
+     style="fill-rule:evenodd;stroke:none;fill:url(#radialGradient199);fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;"
+     id="rect195"
+     x="132.922286"
+     y="44.985791"
+     width="180.546021"
+     height="152.516037"
+     rx="0.000000"
+     ry="0.000000" />
+  <path
+     style="font-size:12;"
+     d="M190.663,5.936c-5.061,1.446-9.362,4.091-12.819,6.217c-3.429,2.109-6.391,3.93-8.675,3.93c-1.638-0.008-8.992-1.666-13.857-2.762C136.747,9.138,111.326,3.41,96.89,8.948c-6.075,2.331-12.5,9.554-19.573,21.903     c-2.881-0.516-6.252-1.12-6.252-1.12c-26.821-4.575-31.491-3.485-35.162-1.446c-4.056,2.253-6.548,6.506-7.408,12.641c-2.447,17.475,9.083,74.245,21.4,86.563c8.377,8.376,57.812,25.158,78.677,31.985c18.515,6.06,35.952,11.253,49.101,14.622     c22.379,5.734,28.731,5.469,33.181,2.88c3.813-2.22,27.168-19.573,43.785-72.776c2.662-8.524,9.468-33.644,9.468-47.996c0-3.091-0.322-5.685-1.082-7.509c-3.955-9.504-12.159-11.312-17.062-12.392c-1.08-0.238-2.589-0.58-3.278-0.888     c-0.104-0.673-0.185-1.879-0.218-2.406c-0.27-4.253-0.722-11.372-7.094-17.743C224.877,4.772,201.883,2.73,190.663,5.936z"
+     id="path172" />
+  <path
+     style="font-size:12;opacity:0.35;fill:none;"
+     d="M197.302,189.345c-19.362,3.052-140.636-33.053-150.459-43.86c-9.823-10.804,43.331-26.142,68.718-28.364c25.388-2.224,148.77,18.649,161.874,32.678c13.104,14.028-60.771,36.495-80.133,39.547z"
+     id="path173"
+     transform="translate(0,-1.64882)" />
+  <path
+     style="font-size:12;"
+     d="M190.372,11.021c-4.399,1.257-8.212,3.601-11.574,5.668c-4.076,2.506-7.597,4.67-11.294,4.67c-2.158,0-8.665-1.466-14.957-2.884c-17.939-4.042-42.507-9.578-55.531-4.582C82.821,19.339,65.881,62.867,62.63,71.537     c-6.489,17.302-13.376,39.529-9.338,47.158c0.962,1.817,3.891,7.35,44.509,21.131c24.85,8.431,52.596,15.986,74.221,20.212c35.505,6.937,44.89,3.31,48.861-0.021c12.253-10.279,22.358-40.088,27.291-56.941c0.511-1.744,12.46-42.828,8.568-52.18     c-2.955-7.102-9.063-8.447-13.521-9.43c-2.514-0.554-4.686-1.033-5.954-2.301c-1.077-1.077-1.255-2.38-1.456-5.56c-0.254-4.004-0.602-9.487-5.639-14.523c-8.767-8.767-29.858-10.9-39.8-8.06z"
+     id="path174" />
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