Force subpixel rendering for Evince 2.32.0.

evince-subpixel-rendering.patch

--- backend/pdf/ev-poppler.cc	2010-09-27 19:54:34.000000000 +0300
+++ backend/pdf/ev-poppler-patched.cc	2013-08-16 20:08:43.000000000 +0300
@@ -342,6 +342,23 @@
 	return label;
 }
 
+/* For some reason, cairo doesn't put this in the public header. */
+typedef enum _cairo_lcd_filter {
+	CAIRO_LCD_FILTER_DEFAULT,
+	CAIRO_LCD_FILTER_NONE,
+	CAIRO_LCD_FILTER_INTRA_PIXEL,
+	CAIRO_LCD_FILTER_FIR3,
+	CAIRO_LCD_FILTER_FIR5
+} cairo_lcd_filter_t;
+
+struct _cairo_font_options {
+	cairo_antialias_t antialias;
+	cairo_subpixel_order_t subpixel_order;
+	cairo_lcd_filter_t lcd_filter;
+	cairo_hint_style_t hint_style;
+	cairo_hint_metrics_t hint_metrics;
+};
+
 static cairo_surface_t *
 pdf_page_render (PopplerPage     *page,
 		 gint             width,
@@ -350,10 +367,24 @@
 {
 	cairo_surface_t *surface;
 	cairo_t *cr;
+	cairo_font_options_t *options;
 
 	surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
 					      width, height);
+	memset (cairo_image_surface_get_data (surface), 0xff,
+		cairo_image_surface_get_height (surface) *
+		cairo_image_surface_get_stride (surface));
+
+	options = cairo_font_options_create ();
+	cairo_surface_get_font_options (surface, options);
+	cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_SUBPIXEL);
+	cairo_font_options_set_subpixel_order (options, CAIRO_SUBPIXEL_ORDER_RGB);
+	cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_SLIGHT);
+	options->lcd_filter = CAIRO_LCD_FILTER_FIR5;
+
 	cr = cairo_create (surface);
+	cairo_set_font_options (cr, options);
+	cairo_font_options_destroy (options);
 
 	switch (rc->rotation) {
 	        case 90:

The corresponding patch for Evince-3.14.2 is as follows.

--- backend/pdf/ev-poppler.cc   2015-03-08 11:25:55.000000000 +0300
+++ backend/pdf/ev-poppler-patched.cc   2015-03-17 23:04:40.000000000 +0300
@@ -377,6 +377,23 @@
    return label;
 }

+/* For some reason, cairo doesn't put this in the public header. */
+typedef enum _cairo_lcd_filter {
+   CAIRO_LCD_FILTER_DEFAULT,
+   CAIRO_LCD_FILTER_NONE,
+   CAIRO_LCD_FILTER_INTRA_PIXEL,
+   CAIRO_LCD_FILTER_FIR3,
+   CAIRO_LCD_FILTER_FIR5
+} cairo_lcd_filter_t;
+
+struct _cairo_font_options {
+   cairo_antialias_t antialias;
+   cairo_subpixel_order_t subpixel_order;
+   cairo_lcd_filter_t lcd_filter;
+   cairo_hint_style_t hint_style;
+   cairo_hint_metrics_t hint_metrics;
+};
+
 static cairo_surface_t *
 pdf_page_render (PopplerPage     *page,
         gint             width,
@@ -385,12 +402,26 @@
 {
    cairo_surface_t *surface;
    cairo_t *cr;
+   cairo_font_options_t *options;
    double page_width, page_height;
    double xscale, yscale;

    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
                          width, height);
+   memset (cairo_image_surface_get_data (surface), 0xff,
+       cairo_image_surface_get_height (surface) *
+       cairo_image_surface_get_stride (surface));
+
+   options = cairo_font_options_create ();
+   cairo_surface_get_font_options (surface, options);
+   cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_SUBPIXEL);
+   cairo_font_options_set_subpixel_order (options, CAIRO_SUBPIXEL_ORDER_RGB);
+   cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_SLIGHT);
+   options->lcd_filter = CAIRO_LCD_FILTER_FIR5;
+
    cr = cairo_create (surface);
+   cairo_set_font_options (cr, options);
+   cairo_font_options_destroy (options);

    switch (rc->rotation) {
            case 90: