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diff --git a/glib/demo/render.c b/glib/demo/render.c
index 78d24bb..d482ceb 100644
--- a/glib/demo/render.c
+++ b/glib/demo/render.c
@@ -82,12 +82,14 @@ pgd_render_start (GtkButton *button,
PgdRenderDemo *demo)
{
PopplerPage *page;
+ gboolean subpixel_rendering;
gdouble page_width, page_height;
gdouble width, height;
gint x, y;
gchar *str;
GTimer *timer;
cairo_t *cr;
+ cairo_font_options_t *fo;
page = poppler_document_get_page (demo->doc, demo->page);
if (!page)
@@ -116,6 +118,21 @@ pgd_render_start (GtkButton *button,
width, height);
cr = cairo_create (demo->surface);
+ fo = cairo_font_options_create ();
+ cairo_get_font_options (cr, fo);
+
+ subpixel_rendering = poppler_page_support_subpixel_rendering (page);
+ // printf("subpixel_rendering %d\n", subpixel_rendering);
+ if (subpixel_rendering) {
+ cairo_set_source_rgb (cr, 1., 1., 1.);
+ cairo_paint (cr);
+ cairo_font_options_set_antialias (fo, CAIRO_ANTIALIAS_SUBPIXEL);
+ cairo_font_options_set_subpixel_order (fo, CAIRO_SUBPIXEL_ORDER_RGB);
+ }
+
+ cairo_set_font_options (cr, fo);
+ cairo_font_options_destroy (fo);
+
cairo_save (cr);
switch (demo->rotate) {
case 90:
@@ -143,9 +160,11 @@ pgd_render_start (GtkButton *button,
poppler_page_render (page, cr);
cairo_restore (cr);
- cairo_set_operator (cr, CAIRO_OPERATOR_DEST_OVER);
- cairo_set_source_rgb (cr, 1., 1., 1.);
- cairo_paint (cr);
+ if (!subpixel_rendering) {
+ cairo_set_operator (cr, CAIRO_OPERATOR_DEST_OVER);
+ cairo_set_source_rgb (cr, 1., 1., 1.);
+ cairo_paint (cr);
+ }
g_timer_stop (timer);
diff --git a/glib/poppler-page.cc b/glib/poppler-page.cc
index 3d63bfd..3dc5585 100644
--- a/glib/poppler-page.cc
+++ b/glib/poppler-page.cc
@@ -2424,3 +2424,13 @@ poppler_page_get_text_attributes_for_area (PopplerPage *page,
return g_list_reverse(attributes);
}
+
+gboolean
+poppler_page_support_subpixel_rendering (PopplerPage *page)
+{
+ CairoOutputDev *output_dev;
+ g_return_val_if_fail (POPPLER_IS_PAGE (page), FALSE);
+
+ output_dev = page->document->output_dev;
+ return page->page->supportSubpixelRendering(output_dev);
+}
diff --git a/glib/poppler-page.h b/glib/poppler-page.h
index fdbfd38..0f02a3a 100644
--- a/glib/poppler-page.h
+++ b/glib/poppler-page.h
@@ -109,6 +109,7 @@ GList *poppler_page_get_text_attributes (PopplerPage *pa
void poppler_page_free_text_attributes (GList *list);
GList * poppler_page_get_text_attributes_for_area (PopplerPage *page,
PopplerRectangle *area);
+gboolean poppler_page_support_subpixel_rendering (PopplerPage *page);
/* A rectangle on a page, with coordinates in PDF points. */
#define POPPLER_TYPE_RECTANGLE (poppler_rectangle_get_type ())
diff --git a/poppler/CairoOutputDev.cc b/poppler/CairoOutputDev.cc
index b0987b3..23ab490 100644
--- a/poppler/CairoOutputDev.cc
+++ b/poppler/CairoOutputDev.cc
@@ -1402,6 +1402,7 @@ void CairoOutputDev::drawChar(GfxState *state, double x, double y,
void CairoOutputDev::endString(GfxState *state)
{
int render;
+ GfxFontType fontType;
if (!currentFont)
return;
@@ -1419,6 +1420,18 @@ void CairoOutputDev::endString(GfxState *state)
goto finish;
}
+ fontType = state->getFont()->getType();
+ // Do not enable subpixel rendering for type3 font
+ // For some reason it does not work
+ if (fontType == fontType3) {
+ cairo_save(cairo);
+ cairo_font_options_t *fo;
+ fo = cairo_font_options_create ();
+ cairo_get_font_options (cairo, fo);
+ cairo_font_options_set_antialias (fo, CAIRO_ANTIALIAS_DEFAULT);
+ cairo_set_font_options (cairo, fo);
+ }
+
if (!(render & 1)) {
LOG (printf ("fill string\n"));
cairo_set_source (cairo, fill_pattern);
@@ -1469,6 +1482,10 @@ void CairoOutputDev::endString(GfxState *state)
}
finish:
+ // pair with the previous cairo_save to disable subpixel rendering for type3 fonts
+ if (fontType == fontType3) {
+ cairo_restore(cairo);
+ }
gfree (glyphs);
glyphs = NULL;
if (use_show_text_glyphs) {
diff --git a/poppler/Gfx.cc b/poppler/Gfx.cc
index 7d748b9..5caf01b 100644
--- a/poppler/Gfx.cc
+++ b/poppler/Gfx.cc
@@ -4727,6 +4727,62 @@ void Gfx::doImage(Object *ref, Stream *str, GBool inlineImg) {
error(errSyntaxError, getPos(), "Bad image parameters");
}
+GBool Gfx::checkNormalBlendModeOnly(Object *str) {
+ // printf("check blender mode start\n");
+ char *cmd;
+ Object obj;
+ Object args[maxArgs];
+ int numArgs, i;
+ GBool onlyNormalBlendMode;
+ Parser myParser(xref, new Lexer(xref, str), gFalse);
+
+ numArgs = 0;
+ onlyNormalBlendMode = gTrue;
+
+ myParser.getObj(&obj);
+ while (!obj.isEOF()) {
+ if (obj.isCmd()) {
+ cmd = obj.getCmd();
+
+ if (strcmp(cmd, "gs") == 0) {
+ Object obj1, obj2;
+ GfxBlendMode mode;
+ if (res->lookupGState(args[0].getName(), &obj1)) {
+ if (!obj1.dictLookup("BM", &obj2)->isNull()) {
+ if (state->parseBlendMode(&obj2, &mode)) {
+ // printf("check blend mode: %d\n", mode);
+ onlyNormalBlendMode &= (mode == gfxBlendNormal);
+ }
+ }
+ obj2.free();
+ }
+ obj1.free();
+ }
+ obj.free();
+
+ for (i = 0; i < numArgs; ++i)
+ args[i].free();
+ numArgs = 0;
+
+ } else if (numArgs < maxArgs) {
+ args[numArgs++] = obj;
+ } else {
+ obj.free();
+ }
+
+ myParser.getObj(&obj);
+ }
+ obj.free();
+
+ if (numArgs > 0) {
+ for (i = 0; i < numArgs; ++i)
+ args[i].free();
+ }
+
+ return onlyNormalBlendMode;
+}
+
+
GBool Gfx::checkTransparencyGroup(Dict *resDict) {
// check the effect of compositing objects as a group:
// look for ExtGState entries with ca != 1 or CA != 1 or BM != normal
diff --git a/poppler/Gfx.h b/poppler/Gfx.h
index a82f9f4..6a7e2c7 100644
--- a/poppler/Gfx.h
+++ b/poppler/Gfx.h
@@ -186,6 +186,9 @@ public:
// Get the current graphics state object.
GfxState *getState() { return state; }
+ // Check whether a stream only contains normal blend mode (to enable subpixel rendering)
+ GBool checkNormalBlendModeOnly(Object *str);
+
GBool checkTransparencyGroup(Dict *resDict);
void drawForm(Object *str, Dict *resDict, double *matrix, double *bbox,
diff --git a/poppler/Page.cc b/poppler/Page.cc
index a4af340..bcb51e0 100644
--- a/poppler/Page.cc
+++ b/poppler/Page.cc
@@ -370,6 +370,20 @@ Dict *Page::getResourceDictCopy(XRef *xrefA) {
return dict ? dict->copy(xrefA) : NULL;
}
+GBool Page::supportSubpixelRendering(OutputDev *out) {
+ GBool supported = gFalse;
+ Object obj;
+ PDFRectangle box;
+
+ contents.fetch(xref, &obj);
+ if (!obj.isNull()) {
+ Gfx gfx(doc, out, attrs->getResourceDict(), &box, NULL);
+ supported = gfx.checkNormalBlendModeOnly(&obj);
+ }
+ obj.free();
+ return supported;
+}
+
void Page::replaceXRef(XRef *xrefA) {
Object obj1;
Dict *pageDict = pageObj.getDict()->copy(xrefA);
diff --git a/poppler/Page.h b/poppler/Page.h
index 2aaabae..a49d34f 100644
--- a/poppler/Page.h
+++ b/poppler/Page.h
@@ -179,6 +179,9 @@ public:
Dict *getResourceDict();
Dict *getResourceDictCopy(XRef *xrefA);
+ // Whether the content in this page supports subpixel rendering (lcdfilter)
+ GBool supportSubpixelRendering(OutputDev *out);
+
// Get annotations array.
Object *getAnnots(Object *obj, XRef *xrefA = NULL) { return annotsObj.fetch((xrefA == NULL) ? xref : xrefA, obj); }
// Add a new annotation to the page
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