Hi,
attached patch implement text rotation in pango producer.
example of usage:
melt \
-v \
-profile square_pal \
/tmp/demo.mp4 \
-consumer sdl \
-filter watermark:pango \
producer.force_apect_ratio="@1/1" \
producer.text="Hi, here!" \
producer.family="Arial" \
producer.size="32" \
producer.weight="700" \
producer.fgcolour="#FF000000" \
producer.bgcolour="#48CCCCFF" \
producer.rot_angle="48" \
composite.geometry="300/-300:100%x100%:100%" \
composite.halign="left" \
composite.valign="bottom"
--
________________________________________
Maksym Veremeyenko
>From cd4dab4903761af2902a9cad6aa210a86e09af2b Mon Sep 17 00:00:00 2001
From: Maksym Veremeyenko <ve...@m1.tv>
Date: Sun, 10 May 2015 19:21:51 +0200
Subject: [PATCH] Implement text rotation in pango producer
---
src/modules/gtk2/producer_pango.c | 47 +++++++++++++++++++++++++++++++---
src/modules/gtk2/producer_pango.yml | 10 +++++++
2 files changed, 52 insertions(+), 5 deletions(-)
diff --git a/src/modules/gtk2/producer_pango.c b/src/modules/gtk2/producer_pango.c
index c450de5..d6f5c68 100644
--- a/src/modules/gtk2/producer_pango.c
+++ b/src/modules/gtk2/producer_pango.c
@@ -80,6 +80,7 @@ struct producer_pango_s
int size;
int style;
int weight;
+ int rot_angle;
};
static void clean_cached( producer_pango self )
@@ -98,7 +99,7 @@ static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int ind
static void producer_close( mlt_producer parent );
static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg );
static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font,
- rgba_color fg, rgba_color bg, rgba_color ol, int pad, int align, char* family, int style, int weight, int size, int outline );
+ rgba_color fg, rgba_color bg, rgba_color ol, int pad, int align, char* family, int style, int weight, int size, int outline, int rot_angle );
static void fill_pixbuf( GdkPixbuf* pixbuf, FT_Bitmap* bitmap, int w, int h, int pad, int align, rgba_color fg, rgba_color bg );
static void fill_pixbuf_with_outline( GdkPixbuf* pixbuf, FT_Bitmap* bitmap, int w, int h, int pad, int align, rgba_color fg, rgba_color bg, rgba_color ol, int outline );
@@ -179,6 +180,7 @@ mlt_producer producer_pango_init( const char *filename )
mlt_properties_set( properties, "style", "normal" );
mlt_properties_set( properties, "encoding", "UTF-8" );
mlt_properties_set_int( properties, "weight", PANGO_WEIGHT_NORMAL );
+ mlt_properties_set_int( properties, "rot_angle", 0 );
mlt_properties_set_int( properties, "seekable", 1 );
if ( filename == NULL || ( filename && ( !strcmp( filename, "" )
@@ -394,6 +396,7 @@ static void refresh_image( mlt_frame frame, int width, int height )
int style = parse_style( mlt_properties_get( producer_props, "style" ) );
char *encoding = mlt_properties_get( producer_props, "encoding" );
int weight = mlt_properties_get_int( producer_props, "weight" );
+ int rot_angle = mlt_properties_get_int( producer_props, "rot_angle" );
int size = mlt_properties_get_int( producer_props, "size" );
int property_changed = 0;
@@ -423,6 +426,7 @@ static void refresh_image( mlt_frame frame, int width, int height )
property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
property_changed = property_changed || ( family && this->family && strcmp( family, this->family ) );
property_changed = property_changed || ( weight != this->weight );
+ property_changed = property_changed || ( rot_angle != this->rot_angle );
property_changed = property_changed || ( style != this->style );
property_changed = property_changed || ( size != this->size );
@@ -438,6 +442,7 @@ static void refresh_image( mlt_frame frame, int width, int height )
set_string( &this->font, font, NULL );
set_string( &this->family, family, "Sans" );
this->weight = weight;
+ this->rot_angle = rot_angle;
this->style = style;
this->size = size;
}
@@ -469,7 +474,7 @@ static void refresh_image( mlt_frame frame, int width, int height )
}
// Render the title
- pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, olcolor, pad, align, family, style, weight, size, outline );
+ pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, olcolor, pad, align, family, style, weight, size, outline, rot_angle );
if ( pixbuf != NULL )
{
@@ -735,11 +740,12 @@ static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
}
}
-static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, rgba_color ol, int pad, int align, char* family, int style, int weight, int size, int outline )
+static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, rgba_color ol, int pad, int align, char* family, int style, int weight, int size, int outline, int rot_angle )
{
PangoContext *context = pango_ft2_font_map_create_context( fontmap );
PangoLayout *layout = pango_layout_new( context );
int w, h;
+ int x = 0, y = 0;
GdkPixbuf *pixbuf = NULL;
FT_Bitmap bitmap;
PangoFontDescription *desc = NULL;
@@ -780,7 +786,38 @@ static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const
// Pango doesn't like empty strings
pango_layout_set_text( layout, " ", 2 );
}
- pango_layout_get_pixel_size( layout, &w, &h );
+
+ if ( rot_angle )
+ {
+ double n_x, n_y;
+ PangoRectangle rect;
+ PangoMatrix m_layout = PANGO_MATRIX_INIT, m_offset = PANGO_MATRIX_INIT;
+
+ pango_matrix_rotate( &m_layout, rot_angle );
+ pango_matrix_rotate( &m_offset, -rot_angle );
+
+ pango_context_set_base_gravity( context, PANGO_GRAVITY_AUTO );
+ pango_context_set_matrix( context, &m_layout );
+ pango_layout_context_changed( layout );
+ pango_layout_get_extents( layout, NULL, &rect );
+ pango_matrix_transform_rectangle( pango_context_get_matrix( context ), &rect);
+
+ n_x = -rect.x;
+ n_y = -rect.y;
+ pango_matrix_transform_point( &m_offset, &n_x, &n_y );
+ rect.x = n_x;
+ rect.y = n_y;
+
+ pango_extents_to_pixels( &rect, NULL );
+
+ w = rect.width;
+ h = rect.height;
+
+ x = rect.x;
+ y = rect.y;
+ }
+ else
+ pango_layout_get_pixel_size( layout, &w, &h );
if ( pad == 0 )
pad = 1;
@@ -797,7 +834,7 @@ static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const
memset( bitmap.buffer, 0, h * bitmap.pitch );
- pango_ft2_render_layout( &bitmap, layout, 0, 0 );
+ pango_ft2_render_layout( &bitmap, layout, x, y );
if ( outline )
{
diff --git a/src/modules/gtk2/producer_pango.yml b/src/modules/gtk2/producer_pango.yml
index 0096322..68fd1c3 100644
--- a/src/modules/gtk2/producer_pango.yml
+++ b/src/modules/gtk2/producer_pango.yml
@@ -223,3 +223,13 @@ parameters:
type: float
description: Optionally override a (mis)detected aspect ratio
mutable: yes
+
+ - identifier: rot_angle
+ title: Rotation angle
+ type: integer
+ description: >
+ The angle of text rotation in degrees. Positive value is clockwise.
+ default: 0
+ readonly: no
+ mutable: yes
+ widget: spinner
--
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