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geometrictransform: Rename some variables for clarity

Browse source 
Renames some variables and adds a minimum doc to the
mapping function for a little clarity.

Also uses gstvideo functions for the row and pixel strides
instead of hardcoded values
This commit is contained in:
Thiago Santos 2010-05-26 18:22:02 -03:00
parent b7660b122c
commit 525aae23dc
3 changed files with 40 additions and 18 deletions
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21
gst/geometrictransform/gstgeometrictransform.c
View file

@ -47,12 +47,18 @@ static gboolean
gst_geometric_transform_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstGeometricTransform *vf;
GstGeometricTransform *gt;
gboolean ret;
vf = GST_GEOMETRIC_TRANSFORM (btrans);
gt = GST_GEOMETRIC_TRANSFORM (btrans);
return gst_video_format_parse_caps (incaps, &vf->format, &vf->width,
&vf->height);
ret = gst_video_format_parse_caps (incaps, &gt->format, &gt->width,
&gt->height);
if (ret) {
gt->row_stride = gst_video_format_get_row_stride (gt->format, 0, gt->width);
gt->pixel_stride = gst_video_format_get_pixel_stride (gt->format, 0);
}
return ret;
}
static void
@ -64,12 +70,11 @@ gst_geometric_transform_do_map (GstGeometricTransform * gt, GstBuffer * inbuf,
gint in_offset;
gint out_offset;
/* NOP */
out_offset = (y * gt->width + x) * 3;
in_offset = (trunc_y * gt->width + trunc_x) * 3;
out_offset = y * gt->row_stride + x * gt->pixel_stride;
in_offset = trunc_y * gt->row_stride + trunc_x * gt->pixel_stride;
memcpy (GST_BUFFER_DATA (outbuf) + out_offset,
GST_BUFFER_DATA (inbuf) + in_offset, 3);
GST_BUFFER_DATA (inbuf) + in_offset, gt->pixel_stride);
}
static GstFlowReturn

18
gst/geometrictransform/gstgeometrictransform.h
View file

@ -41,8 +41,22 @@ G_BEGIN_DECLS
typedef struct _GstGeometricTransform GstGeometricTransform;
typedef struct _GstGeometricTransformClass GstGeometricTransformClass;
/**
* GstGeometricTransformMapFunc:
*
* Given the output pixel position, this function calculates the input pixel
* position. The element using this function will then copy the input pixel
* data to the output pixel.
*
* @gt: The #GstGeometricTransform
* @x: The output pixel x coordinate
* @y: The output pixel y coordinate
* @_input_x: The input pixel x coordinate
* @_input_y: The input pixel y coordinate
* Returns: True on success, false otherwise
*/
typedef gboolean (*GstGeometricTransformMapFunc) (GstGeometricTransform * gt,
gint x, gint y, gdouble * _out_x, gdouble *_out_y);
gint x, gint y, gdouble * _input_x, gdouble *_input_y);
/**
* GstGeometricTransform:
@ -54,6 +68,8 @@ struct _GstGeometricTransform {
gint width, height;
GstVideoFormat format;
gint pixel_stride;
gint row_stride;
};
struct _GstGeometricTransformClass {

19
gst/geometrictransform/gstpinch.c
View file

@ -155,8 +155,8 @@ gst_pinch_base_init (gpointer gclass)
/* FIXME optimize a little using cast macro and pre calculating some
* values so we don't need them every mapping */
static gboolean
dummy_map (GstGeometricTransform * gt, gint x, gint y, gdouble * ox,
gdouble * oy)
dummy_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble * in_y)
{
GstPinch *pinch = GST_PINCH (gt);
gdouble r2;
@ -181,8 +181,8 @@ dummy_map (GstGeometricTransform * gt, gint x, gint y, gdouble * ox,
", dy=%lf", x, y, distance, r2, dx, dy);
if (distance > r2 || distance == 0) {
*ox = x;
*oy = y;
*in_x = x;
*in_y = y;
} else {
gdouble d = sqrt (distance / r2);
gdouble t = pow (sin (G_PI * 0.5 * d), -pinch->intensity);
@ -192,14 +192,15 @@ dummy_map (GstGeometricTransform * gt, gint x, gint y, gdouble * ox,
GST_LOG_OBJECT (pinch, "D=%lf, t=%lf, dx=%lf" ", dy=%lf", d, t, dx, dy);
*ox = x_center + dx;
*oy = y_center + dy;
*in_x = x_center + dx;
*in_y = y_center + dy;
*ox = CLAMP (*ox, 0, gt->width - 1);
*oy = CLAMP (*oy, 0, gt->height - 1);
*in_x = CLAMP (*in_x, 0, gt->width - 1);
*in_y = CLAMP (*in_y, 0, gt->height - 1);
}
GST_DEBUG_OBJECT (pinch, "Mapped %d %d into %lf %lf", x, y, *ox, *oy);
GST_DEBUG_OBJECT (pinch, "Inversely mapped %d %d into %lf %lf",
x, y, *in_x, *in_y);
return TRUE;
}