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/* XPS interpreter - analyze page checking for transparency.
* This is a stripped down parser that looks for alpha values < 1.0 in
* any part of the page.
*/
#include "fitz.h"
#include "muxps.h"
static int
xps_remote_resource_dictionary_has_transparency(xps_context *ctx, char *base_uri, char *source_att)
{
//dputs("page has transparency: uses a remote resource; not parsed; being conservative\n");
return 1;
}
int
xps_resource_dictionary_has_transparency(xps_context *ctx, char *base_uri, xml_element *root)
{
char *source;
xml_element *node;
source = xml_att(root, "Source");
if (source)
return xps_remote_resource_dictionary_has_transparency(ctx, base_uri, source);
for (node = xml_down(root); node; node = xml_next(node))
{
// TODO: ... all kinds of stuff can be here, brushes, elements, whatnot
}
return 1;
}
static int
xps_gradient_stops_have_transparency(xps_context *ctx, char *base_uri, xml_element *root)
{
xml_element *node;
fz_colorspace *colorspace;
char *color_att;
float samples[32];
for (node = xml_down(root); node; node = xml_next(node))
{
if (!strcmp(xml_tag(node), "GradientStop"))
{
color_att = xml_att(node, "Color");
if (color_att)
{
xps_parse_color(ctx, base_uri, color_att, &colorspace, samples);
if (samples[0] < 1.0)
{
//dputs("page has transparency: GradientStop has alpha\n");
return 1;
}
}
}
}
return 0;
}
static int
xps_gradient_brush_has_transparency(xps_context *ctx, char *base_uri, xml_element *root)
{
xml_element *node;
char *opacity_att;
opacity_att = xml_att(root, "Opacity");
if (opacity_att)
{
if (atof(opacity_att) < 1.0)
{
//dputs("page has transparency: GradientBrush Opacity\n");
return 1;
}
}
for (node = xml_down(root); node; node = xml_next(node))
{
if (!strcmp(xml_tag(node), "RadialGradientBrush.GradientStops"))
{
if (xps_gradient_stops_have_transparency(ctx, base_uri, node))
return 1;
}
if (!strcmp(xml_tag(node), "LinearGradientBrush.GradientStops"))
{
if (xps_gradient_stops_have_transparency(ctx, base_uri, node))
return 1;
}
}
return 0;
}
static int
xps_brush_has_transparency(xps_context *ctx, char *base_uri, xml_element *root)
{
char *opacity_att;
char *color_att;
xml_element *node;
fz_colorspace *colorspace;
float samples[32];
if (!strcmp(xml_tag(root), "SolidColorBrush"))
{
opacity_att = xml_att(root, "Opacity");
if (opacity_att)
{
if (atof(opacity_att) < 1.0)
{
//dputs("page has transparency: SolidColorBrush Opacity\n");
return 1;
}
}
color_att = xml_att(root, "Color");
if (color_att)
{
xps_parse_color(ctx, base_uri, color_att, &colorspace, samples);
if (samples[0] < 1.0)
{
//dputs("page has transparency: SolidColorBrush Color has alpha\n");
return 1;
}
}
}
if (!strcmp(xml_tag(root), "VisualBrush"))
{
char *opacity_att = xml_att(root, "Opacity");
if (opacity_att)
{
if (atof(opacity_att) < 1.0)
{
//dputs("page has transparency: VisualBrush Opacity\n");
return 1;
}
}
for (node = xml_down(root); node; node = xml_next(node))
{
if (!strcmp(xml_tag(node), "VisualBrush.Visual"))
{
if (xps_element_has_transparency(ctx, base_uri, xml_down(node)))
return 1;
}
}
}
if (!strcmp(xml_tag(root), "ImageBrush"))
{
if (xps_image_brush_has_transparency(ctx, base_uri, root))
return 1;
}
if (!strcmp(xml_tag(root), "LinearGradientBrush"))
{
if (xps_gradient_brush_has_transparency(ctx, base_uri, root))
return 1;
}
if (!strcmp(xml_tag(root), "RadialGradientBrush"))
{
if (xps_gradient_brush_has_transparency(ctx, base_uri, root))
return 1;
}
return 0;
}
static int
xps_path_has_transparency(xps_context *ctx, char *base_uri, xml_element *root)
{
xml_element *node;
for (node = xml_down(root); node; node = xml_next(node))
{
if (!strcmp(xml_tag(node), "Path.OpacityMask"))
{
//dputs("page has transparency: Path.OpacityMask\n");
return 1;
}
if (!strcmp(xml_tag(node), "Path.Stroke"))
{
if (xps_brush_has_transparency(ctx, base_uri, xml_down(node)))
return 1;
}
if (!strcmp(xml_tag(node), "Path.Fill"))
{
if (xps_brush_has_transparency(ctx, base_uri, xml_down(node)))
return 1;
}
}
return 0;
}
static int
xps_glyphs_has_transparency(xps_context *ctx, char *base_uri, xml_element *root)
{
xml_element *node;
for (node = xml_down(root); node; node = xml_next(node))
{
if (!strcmp(xml_tag(node), "Glyphs.OpacityMask"))
{
//dputs("page has transparency: Glyphs.OpacityMask\n");
return 1;
}
if (!strcmp(xml_tag(node), "Glyphs.Fill"))
{
if (xps_brush_has_transparency(ctx, base_uri, xml_down(node)))
return 1;
}
}
return 0;
}
static int
xps_canvas_has_transparency(xps_context *ctx, char *base_uri, xml_element *root)
{
xml_element *node;
for (node = xml_down(root); node; node = xml_next(node))
{
if (!strcmp(xml_tag(node), "Canvas.Resources"))
{
if (xps_resource_dictionary_has_transparency(ctx, base_uri, xml_down(node)))
return 1;
}
if (!strcmp(xml_tag(node), "Canvas.OpacityMask"))
{
//dputs("page has transparency: Canvas.OpacityMask\n");
return 1;
}
if (xps_element_has_transparency(ctx, base_uri, node))
return 1;
}
return 0;
}
int
xps_element_has_transparency(xps_context *ctx, char *base_uri, xml_element *node)
{
char *opacity_att;
char *stroke_att;
char *fill_att;
fz_colorspace *colorspace;
float samples[32];
stroke_att = xml_att(node, "Stroke");
if (stroke_att)
{
xps_parse_color(ctx, base_uri, stroke_att, &colorspace, samples);
if (samples[0] < 1.0)
{
//dprintf1("page has transparency: Stroke alpha=%g\n", samples[0]);
return 1;
}
}
fill_att = xml_att(node, "Fill");
if (fill_att)
{
xps_parse_color(ctx, base_uri, fill_att, &colorspace, samples);
if (samples[0] < 1.0)
{
//dprintf1("page has transparency: Fill alpha=%g\n", samples[0]);
return 1;
}
}
opacity_att = xml_att(node, "Opacity");
if (opacity_att)
{
if (atof(opacity_att) < 1.0)
{
//dprintf1("page has transparency: Opacity=%g\n", atof(opacity_att));
return 1;
}
}
if (xml_att(node, "OpacityMask"))
{
//dputs("page has transparency: OpacityMask\n");
return 1;
}
if (!strcmp(xml_tag(node), "Path"))
if (xps_path_has_transparency(ctx, base_uri, node))
return 1;
if (!strcmp(xml_tag(node), "Glyphs"))
if (xps_glyphs_has_transparency(ctx, base_uri, node))
return 1;
if (!strcmp(xml_tag(node), "Canvas"))
if (xps_canvas_has_transparency(ctx, base_uri, node))
return 1;
return 0;
}
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