Wefax b/w fix

* The generated image is now really back and white.
* Display speedup.

src/include/picture.h

@@ -35,7 +35,7 @@ private:
 	int bufsize;
 	int width;
 	int height;
-	int depth;
+	static const int depth = 3;
 	int numcol;
 	int slantdir;
 	void slant_corr(int x, int y);
@@ -48,7 +48,16 @@ public:
 	picture(int, int, int, int, int bg_col = 0);
 	~picture();
 	void	video(unsigned char *, int);
-	void	pixel(unsigned char, int);
+	void	pixel(unsigned char data, int pos) {
+		if (pos < 0 || pos >= bufsize) {
+			return ;
+		}
+		FL_LOCK_D();
+		vidbuf[pos] = data;
+		if (pos % (width * depth) == 0)
+			redraw();
+		FL_UNLOCK_D();
+	}
 	unsigned char	pixel(int);
 	int		handle(int);
 	void	draw();

src/wefax/wefax-pic.cxx

@@ -321,9 +321,6 @@ int wefax_pic::update_rx_pic_col(unsigned char data, int pix_pos )
 	/// Each time the received image becomes too high, we increase its height.
 	static const int curr_pix_incr_height = 100 ;
 
-	/// Maybe there is a slant.
-	pix_pos = ( double )pix_pos * slant_factor_default() + 0.5 ;
-
 	/// Three ints per pixel. It is safer to recalculate the 
 	/// row index to avoid any buffer overflow, because the given
 	/// row is invalid if the image was horizontally moved.
@@ -449,11 +446,17 @@ void wefax_pic::update_rx_pic_bw(unsigned char data, int pix_pos )
 		return ;
 	};
 	/// The image must be horizontally shifted.
-	pix_pos += center_val_prev ;
+	pix_pos += center_val_prev * bytes_per_pix ;
 	if( pix_pos < 0 ) {
 		pix_pos = 0 ;
 	}
 
+	/// Maybe there is a slant.
+	pix_pos = ( double )pix_pos * slant_factor_default() + 0.5 ;
+
+	/// Must be a multiple of the number of bytes per pixel.
+	pix_pos = ( pix_pos / bytes_per_pix ) * bytes_per_pix ;
+
 	static int last_row_number = 0 ;
 
 	                 update_rx_pic_col(data, pix_pos);
@@ -1082,9 +1085,7 @@ void wefax_pic::create_rx_viewer(int pos_x, int pos_y,int win_wid, int hei_win)
 	wefax_slider_rx_center = new Fl_Slider(wid_off_low, hei_off_low, wid_btn_curr, height_btn, _(title_center));
 	wefax_slider_rx_center->type(FL_HORIZONTAL);
 	wefax_slider_rx_center->align(FL_ALIGN_LEFT);
-	/// Multiplied by three because of color image.
-	double range_rx_center = bytes_per_pix * (double)wid_img ;
-	wefax_slider_rx_center->range(-range_rx_center, range_rx_center);
+	/// The range is set when the image size in pixels is known.
 	wefax_slider_rx_center->step(1.0);
 	wefax_slider_rx_center->callback(wefax_cb_pic_rx_center, 0);
 	wefax_slider_rx_center->tooltip(_("Align image horizontally."));
@@ -1146,6 +1147,10 @@ void wefax_pic::resize_rx_viewer(int wid_img)
 	snprintf( buffer_width, sizeof(buffer_width), "%d", wid_img );
 	wefax_out_rx_width->value(buffer_width);
 
+	/// This is a number of pixels.
+	double range_rx_center = wid_img / 2.0 ;
+	wefax_slider_rx_center->range(-range_rx_center, range_rx_center);
+
 	wefax_pic_rx_win->redraw();
 	FL_UNLOCK_D();
 }

src/widgets/picture.cxx

@@ -60,7 +60,6 @@ picture::picture (int X, int Y, int W, int H, int bg_col) :
 {
 	width = W;
 	height = H;
-	depth = 3;
 	bufsize = W * H * depth;
 	numcol = 0;
 	slantdir = 0;
@@ -84,19 +83,6 @@ void picture::video(unsigned char *data, int len )
 	FL_UNLOCK_D();
 }
 
-void picture::pixel(unsigned char data, int pos)
-{
-	if (pos < 0 || pos >= bufsize) {
-		LOG_ERROR("Image overflow pos=%d bufsize=%d", pos, bufsize );
-		return ;
-	}
-	FL_LOCK_D();
-	vidbuf[pos] = data;
-	if (pos % (width * 3) == 0)
-		redraw();
-	FL_UNLOCK_D();
-}
-
 unsigned char picture::pixel(int pos)
 {
 	if (pos < 0 || pos >= bufsize) return 0;
@@ -183,17 +169,19 @@ void picture::stretch(double the_ratio)
 	unsigned char * new_vidbuf = new unsigned char[new_bufsize];
 
 	/// No interpolation, it takes the nearest pixel.
-	for( int ix_out = 0 ; ix_out < new_bufsize ; ++ix_out ) {
+	for( int ix_out = 0 ; ix_out < new_bufsize ; ix_out += depth ) {
 
-		/// TODO: ix_out could be double to qvoid this conversion.
 		int ix_in = ( double )ix_out * the_ratio + 0.5 ;
+		ix_in = ( ix_in / depth ) * depth ;
 		if( ix_in >= bufsize ) {
 			/// Grey value as a filler to indicate the end. For debugging.
 			memset( new_vidbuf + ix_out, 128, new_bufsize - ix_out );
 			break ;
 		}
-		/// TODO: It might not properly work with color images !!!!
-		new_vidbuf[ ix_out ] = vidbuf[ ix_in ];
+		for( int i = 0; i < depth ; ++i )
+		{
+			new_vidbuf[ ix_out + i ] = vidbuf[ ix_in + i ];
+		}
 	};
 
 	delete [] vidbuf ;
@@ -208,6 +196,8 @@ void picture::stretch(double the_ratio)
 /// Beware that it is not protected by FL_LOCK_D/FL_UNLOCK_D
 void picture::shift_horizontal_center(int horizontal_shift)
 {
+	/// This is a number of pixels.
+	horizontal_shift *= depth ;
 	if( horizontal_shift < -bufsize ) {
 		horizontal_shift = -bufsize ;
 	}
@@ -240,14 +230,13 @@ void picture::set_zoom( int the_zoom )
 void picture::draw_cb( void *data, int x_screen, int y_screen, int wid_screen, uchar *buf) 
 {
 	const picture * ptr_pic = ( const picture * ) data ;
-	static const int dpth=3 ;
 	int img_width = ptr_pic->width ;
 	const unsigned char * in_ptr = ptr_pic->vidbuf ;
-	const int max_buf_offset = ptr_pic->bufsize - dpth ;
+	const int max_buf_offset = ptr_pic->bufsize - depth ;
 	/// Should not happen because tested before. This ensures that memcpy is OK.
 	if( ptr_pic->zoom == 0 ) {
 		int in_offset = img_width * y_screen + x_screen ;
-		memcpy( buf, in_ptr + in_offset * dpth, dpth * wid_screen );
+		memcpy( buf, in_ptr + in_offset * depth, depth * wid_screen );
 		return ;
 	}
 
@@ -265,10 +254,10 @@ void picture::draw_cb( void *data, int x_screen, int y_screen, int wid_screen, u
 				stride );
 			return ;
 		}
-		int dpth_in_offset = dpth * in_offset ;
+		int dpth_in_offset = depth * in_offset ;
 
 		/// Check the latest offset.
-		if( dpth_in_offset + dpth * stride * wid_screen >= max_buf_offset ) {
+		if( dpth_in_offset + depth * stride * wid_screen >= max_buf_offset ) {
 			LOG_WARN(
 				"Boom1 y_sc=%d h=%d w=%d wd_sc=%d wdt=%d strd=%d off=%d prd=%d mbo=%d\n",
 				y_screen,
@@ -278,15 +267,15 @@ void picture::draw_cb( void *data, int x_screen, int y_screen, int wid_screen, u
 				img_width,
 				stride,
 				in_offset,
-				( dpth_in_offset + dpth ),
+				( dpth_in_offset + depth ),
 				max_buf_offset );
 			return ;
 		}
-		for( int ix_w = 0, max_w = wid_screen * dpth; ix_w < max_w ; ix_w += dpth ) {
+		for( int ix_w = 0, max_w = wid_screen * depth; ix_w < max_w ; ix_w += depth ) {
 			buf[ ix_w     ] = in_ptr[ dpth_in_offset     ];
 			buf[ ix_w + 1 ] = in_ptr[ dpth_in_offset + 1 ];
 			buf[ ix_w + 2 ] = in_ptr[ dpth_in_offset + 2 ];
-			dpth_in_offset += dpth * stride ;
+			dpth_in_offset += depth * stride ;
 		}
 		return ;
 	}
@@ -306,9 +295,8 @@ void picture::draw_cb( void *data, int x_screen, int y_screen, int wid_screen, u
 				stride );
 			return ;
 		}
-		/// TODO: Will not properly work for color images.
-		int dpth_in_offset = dpth * in_offset ;
-		for( int ix_w = 0, max_w = wid_screen * dpth; ix_w < max_w ; ix_w += dpth ) {
+		int dpth_in_offset = depth * in_offset ;
+		for( int ix_w = 0, max_w = wid_screen * depth; ix_w < max_w ; ix_w += depth ) {
 #ifndef NDEBUG
 			if( dpth_in_offset >= max_buf_offset ) {
 				LOG_WARN(
@@ -328,8 +316,8 @@ void picture::draw_cb( void *data, int x_screen, int y_screen, int wid_screen, u
 			buf[ ix_w     ] = in_ptr[ dpth_in_offset     ];
 			buf[ ix_w + 1 ] = in_ptr[ dpth_in_offset + 1 ];
 			buf[ ix_w + 2 ] = in_ptr[ dpth_in_offset + 2 ];
-			if( ( ix_w % ( dpth * stride ) ) == 0 ) {
-				dpth_in_offset += dpth ;
+			if( ( ix_w % ( depth * stride ) ) == 0 ) {
+				dpth_in_offset += depth ;
 			}
 		}
 		return ;