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basescope: add more shading effects

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=651536
This commit is contained in:
Stefan Kost 2011-05-28 14:36:51 +03:00
parent efe9f3328d
commit 2d101863dc
2 changed files with 164 additions and 1 deletions
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159
gst/scopes/gstbasescope.c
View file

@ -75,6 +75,11 @@ gst_base_scope_shader_get_type (void)
{GST_BASE_SCOPE_SHADER_FADE, "Fade", "fade"},
{GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_UP, "Fade and move up",
"fade-and-move-up"},
{GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_DOWN, "Fade and move down",
"fade-and-move-down"},
{GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_HORIZ_OUT,
"Fade and move horizontaly out",
"fade-and-move-horiz-out"},
{0, NULL, NULL},
};
@ -168,6 +173,154 @@ shader_fade_and_move_up (GstBaseScope * scope, const guint8 * s, guint8 * d)
#endif
}
static void
shader_fade_and_move_down (GstBaseScope * scope, const guint8 * s, guint8 * d)
{
guint i, j, bpf = scope->bpf;
guint bpl = 4 * scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
for (i = 0; i < bpl;) {
d[i] = (s[i] > b) ? s[i] - b : 0;
i++;
d[i] = (s[i] > g) ? s[i] - g : 0;
i++;
d[i] = (s[i] > r) ? s[i] - r : 0;
i++;
d[i++] = 0;
}
for (j = bpl, i = 0; j < bpf;) {
d[j++] = (s[i] > b) ? s[i] - b : 0;
i++;
d[j++] = (s[i] > g) ? s[i] - g : 0;
i++;
d[j++] = (s[i] > r) ? s[i] - r : 0;
i++;
d[j++] = 0;
i++;
}
#else
for (i = 0; i < bpl;) {
d[i++] = 0;
d[i] = (s[i] > r) ? s[i] - r : 0;
i++;
d[i] = (s[i] > g) ? s[i] - g : 0;
i++;
d[i] = (s[i] > b) ? s[i] - b : 0;
i++;
}
for (j = bpl, i = 0; j < bpf;) {
d[j++] = 0;
i++;
d[j++] = (s[i] > r) ? s[i] - r : 0;
i++;
d[j++] = (s[i] > g) ? s[i] - g : 0;
i++;
d[j++] = (s[i] > b) ? s[i] - b : 0;
i++;
}
#endif
}
static void
shader_fade_and_move_horiz_out (GstBaseScope * scope, const guint8 * s,
guint8 * d)
{
guint i, j, bpf = scope->bpf / 2;
guint bpl = 4 * scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
/* middle up */
for (j = 0, i = bpl; i < bpf;) {
d[j++] = (s[i] > b) ? s[i] - b : 0;
i++;
d[j++] = (s[i] > g) ? s[i] - g : 0;
i++;
d[j++] = (s[i] > r) ? s[i] - r : 0;
i++;
d[j++] = 0;
i++;
}
for (i = 0; i < bpl; i += 4) {
d[j] = (s[j] > b) ? s[j] - b : 0;
j++;
d[j] = (s[j] > g) ? s[j] - g : 0;
j++;
d[j] = (s[j] > r) ? s[j] - r : 0;
j++;
d[j++] = 0;
}
/* middle down */
for (i = bpf; i < bpf + bpl;) {
d[i] = (s[i] > b) ? s[i] - b : 0;
i++;
d[i] = (s[i] > g) ? s[i] - g : 0;
i++;
d[i] = (s[i] > r) ? s[i] - r : 0;
i++;
d[i++] = 0;
}
for (j = bpf + bpl, i = bpf; j < bpf + bpf;) {
d[j++] = (s[i] > b) ? s[i] - b : 0;
i++;
d[j++] = (s[i] > g) ? s[i] - g : 0;
i++;
d[j++] = (s[i] > r) ? s[i] - r : 0;
i++;
d[j++] = 0;
i++;
}
#else
/* middle up */
for (j = 0, i = bpl; i < bpf;) {
d[j++] = 0;
i++;
d[j++] = (s[i] > r) ? s[i] - r : 0;
i++;
d[j++] = (s[i] > g) ? s[i] - g : 0;
i++;
d[j++] = (s[i] > b) ? s[i] - b : 0;
i++;
}
for (i = 0; i < bpl; i += 4) {
d[j++] = 0;
d[j] = (s[j] > r) ? s[j] - r : 0;
j++;
d[j] = (s[j] > g) ? s[j] - g : 0;
j++;
d[j] = (s[j] > b) ? s[j] - b : 0;
j++;
}
/* middle down */
for (i = bpf; i < bpf + bpl;) {
d[i++] = 0;
d[i] = (s[i] > r) ? s[i] - r : 0;
i++;
d[i] = (s[i] > g) ? s[i] - g : 0;
i++;
d[i] = (s[i] > b) ? s[i] - b : 0;
i++;
}
for (j = bpf + bpl, i = bpf; j < bpf + bpf;) {
d[j++] = 0;
i++;
d[j++] = (s[i] > r) ? s[i] - r : 0;
i++;
d[j++] = (s[i] > g) ? s[i] - g : 0;
i++;
d[j++] = (s[i] > b) ? s[i] - b : 0;
i++;
}
#endif
}
static void
gst_base_scope_change_shader (GstBaseScope * scope)
{
@ -181,6 +334,12 @@ gst_base_scope_change_shader (GstBaseScope * scope)
case GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_UP:
scope->shader = shader_fade_and_move_up;
break;
case GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_DOWN:
scope->shader = shader_fade_and_move_down;
break;
case GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_HORIZ_OUT:
scope->shader = shader_fade_and_move_horiz_out;
break;
default:
GST_ERROR ("invalid shader function");
scope->shader = NULL;

6
gst/scopes/gstbasescope.h
View file

@ -44,13 +44,17 @@ typedef void (*GstBaseScopeShaderFunc)(GstBaseScope *scope, const guint8 *s, gui
* @GST_BASE_SCOPE_SHADER_NONE: no shading
* @GST_BASE_SCOPE_SHADER_FADE: plain fading
* @GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_UP: fade and move up
* @GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_DOWN: fade and move down
* @GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_HORIZ_OUT: fade and move horizontaly out
*
* Different types of supported background shading functions.
*/
typedef enum {
GST_BASE_SCOPE_SHADER_NONE,
GST_BASE_SCOPE_SHADER_FADE,
GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_UP
GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_UP,
GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_DOWN,
GST_BASE_SCOPE_SHADER_FADE_AND_MOVE_HORIZ_OUT
} GstBaseScopeShader;
struct _GstBaseScope