DFBResult
IGraphicsState_Real__SetSrcBlend(
CoreGraphicsState *obj,
DFBSurfaceBlendFunction function
)
{
D_DEBUG_AT( DirectFB_CoreGraphicsState, "%s()\n", __FUNCTION__ );
dfb_state_set_src_blend( &obj->state, function );
return DFB_OK;
}
static void
draw_window( SaWManTier *tier,
SaWManWindow *sawwin,
SaWManWindow *sawwin2,
CardState *state,
DFBRegion *region,
bool alpha_channel,
bool right_eye )
{
SaWMan *sawman;
CoreWindow *window;
DFBSurfaceBlittingFlags flags = DSBLIT_NOFX;
DFBRectangle dst;
DFBRectangle src;
DFBRegion clip;
DFBRegion old_clip;
int offset;
D_MAGIC_ASSERT( sawwin, SaWManWindow );
D_MAGIC_ASSERT( state, CardState );
DFB_REGION_ASSERT( region );
sawman = sawwin->sawman;
window = sawwin->window;
dst = sawwin->dst;
src = sawwin->src;
D_MAGIC_ASSERT( sawman, SaWMan );
D_ASSERT( window != NULL );
D_ASSERT( window->surface != NULL );
D_DEBUG_AT( SaWMan_Draw, "%s( %p, %d,%d-%dx%d )\n", __FUNCTION__,
sawwin, DFB_RECTANGLE_VALS_FROM_REGION( region ) );
if (window->config.options & DWOP_STEREO_SIDE_BY_SIDE_HALF) {
src.x /= 2;
src.w /= 2;
if (right_eye)
src.x += window->surface->config.size.w / 2;
}
/* Modify dst for stereo offset. */
offset = window->config.z;
offset *= right_eye ? -1 : 1;
dfb_rectangle_translate( &dst, offset, 0 );
/* Setup clipping region. */
clip = *region;
if (!dfb_region_rectangle_intersect( &clip, &dst ))
return;
sawman_dispatch_blit( sawman, sawwin, right_eye, &sawwin->src, &dst, &clip );
if (sawwin2)
sawman_dispatch_blit( sawman, sawwin2, right_eye, &sawwin2->src, &dst, &clip );
/* Backup clipping region. */
old_clip = state->clip;
/* Use per pixel alpha blending. */
if (alpha_channel && (window->config.options & DWOP_ALPHACHANNEL))
flags |= DSBLIT_BLEND_ALPHACHANNEL;
/* Use global alpha blending. */
if (window->config.opacity != 0xFF) {
flags |= DSBLIT_BLEND_COLORALPHA;
if (window->surface->config.caps & DSCAPS_PREMULTIPLIED) {
/* Need to premultiply source with Ac? */
flags |= DSBLIT_SRC_PREMULTCOLOR;
dfb_state_set_src_blend( state, DSBF_ONE );
}
else
dfb_state_set_src_blend( state, DSBF_SRCALPHA );
/* Set opacity as blending factor. */
if (state->color.a != window->config.opacity) {
state->color.a = window->config.opacity;
state->modified |= SMF_COLOR;
}
}
/* if we specified some kind of color, we will colorise. no DWCAPS_COLOR here. */
if (window->config.color.a != 0) {
DFBColor c;
flags |= DSBLIT_COLORIZE;
c = window->config.color;
c.a = state->color.a;
if (! DFB_COLOR_EQUAL( c, state->color )) {
state->color = c;
state->modified |= SMF_COLOR;
}
}
/* Use source color keying. */
if (window->config.options & DWOP_COLORKEYING) {
flags |= DSBLIT_SRC_COLORKEY;
D_DEBUG_AT( SaWMan_Draw, " -> key 0x%08x\n", window->config.color_key );
/* Set window color key. */
dfb_state_set_src_colorkey( state, window->config.color_key );
}
/* Use automatic deinterlacing. */
if (window->surface->config.caps & DSCAPS_INTERLACED)
flags |= DSBLIT_DEINTERLACE;
/* Different compositing methods depending on destination format. */
if (flags & DSBLIT_BLEND_ALPHACHANNEL) {
if (DFB_PIXELFORMAT_HAS_ALPHA( state->destination->config.format )) {
/*
* Always use compliant Porter/Duff SRC_OVER,
* if the destination has an alpha channel.
*
* Cd = destination color (non-premultiplied)
* Ad = destination alpha
*
* Cs = source color (non-premultiplied)
* As = source alpha
*
* Ac = color alpha
*
* cd = Cd * Ad (premultiply destination)
* cs = Cs * As (premultiply source)
*
* The full equation to calculate resulting color and alpha (premultiplied):
*
* cx = cd * (1-As*Ac) + cs * Ac
* ax = Ad * (1-As*Ac) + As * Ac
*/
dfb_state_set_src_blend( state, DSBF_ONE );
/* Need to premultiply source with As*Ac or only with Ac? */
if (! (window->surface->config.caps & DSCAPS_PREMULTIPLIED))
flags |= DSBLIT_SRC_PREMULTIPLY;
else if (flags & DSBLIT_BLEND_COLORALPHA)
flags |= DSBLIT_SRC_PREMULTCOLOR;
/* Need to premultiply/demultiply destination? */
// if (! (state->destination->caps & DSCAPS_PREMULTIPLIED))
// flags |= DSBLIT_DST_PREMULTIPLY | DSBLIT_DEMULTIPLY;
}
else {
/*
* We can avoid DSBLIT_SRC_PREMULTIPLY for destinations without an alpha channel
* by using another blending function, which is more likely that it's accelerated
* than premultiplication at this point in time.
*
* This way the resulting alpha (ax) doesn't comply with SRC_OVER,
* but as the destination doesn't have an alpha channel it's no problem.
*
* As the destination's alpha value is always 1.0 there's no need for
* premultiplication. The resulting alpha value will also be 1.0 without
* exceptions, therefore no need for demultiplication.
*
* cx = Cd * (1-As*Ac) + Cs*As * Ac (still same effect as above)
* ax = Ad * (1-As*Ac) + As*As * Ac (wrong, but discarded anyways)
*/
if (window->surface->config.caps & DSCAPS_PREMULTIPLIED) {
/* Need to premultiply source with Ac? */
if (flags & DSBLIT_BLEND_COLORALPHA)
flags |= DSBLIT_SRC_PREMULTCOLOR;
dfb_state_set_src_blend( state, DSBF_ONE );
}
else
dfb_state_set_src_blend( state, DSBF_SRCALPHA );
}
}
/* Use color (key) protection if layer is keyed. */
if (tier->context->config.options & DLOP_SRC_COLORKEY) {
flags |= DSBLIT_COLORKEY_PROTECT;
dfb_state_set_colorkey( state, &tier->key );
}
/* Set blitting flags. */
dfb_state_set_blitting_flags( state, flags );
/* Set render options. */
if (sawman->scaling_mode == SWMSM_SMOOTH)
dfb_state_set_render_options( state, DSRO_SMOOTH_DOWNSCALE | DSRO_SMOOTH_UPSCALE );
else
dfb_state_set_render_options( state, DSRO_NONE );
/* Set blitting source. */
state->source = window->surface;
state->from_eye = (right_eye && (sawwin->caps & DWCAPS_STEREO)) ? DSSE_RIGHT : DSSE_LEFT;
state->modified |= SMF_SOURCE | SMF_FROM;
D_DEBUG_AT( SaWMan_Draw, " [][] %4d,%4d-%4dx%4d\n", DFB_RECTANGLE_VALS_FROM_REGION( &clip ) );
/* Change clipping region. */
dfb_state_set_clip( state, &clip );
D_DEBUG_AT( SaWMan_Draw, " => %4d,%4d-%4dx%4d <- %4d,%4d-%4dx%4d\n",
DFB_RECTANGLE_VALS( &dst ), DFB_RECTANGLE_VALS( &src ) );
#ifndef OLD_COREWINDOWS_STRUCTURE
if (sawwin2) {
CoreWindow *window2;
DFBRectangle *src2;
DFBPoint p1,p2,p;
D_MAGIC_ASSERT( sawwin2, SaWManWindow );
window2 = sawwin2->window;
D_ASSERT( window2 != NULL );
D_ASSERT( window2->surface != NULL );
src2 = &sawwin2->src;
state->source2 = window2->surface;
state->modified = SMF_SOURCE2;
p1.x = src2->x + (sawwin->dst.x - sawwin2->dst.x);
p1.y = src2->y + (sawwin->dst.y - sawwin2->dst.y);
p2.x = sawwin->dst.x;
p2.y = sawwin->dst.y;
p.x = p1.x;
p.y = p1.y;
p1.x = src.x;
p1.y = src.y;
src.x = p.x;
src.y = p.y;
CoreGraphicsStateClient_Blit2( state->client, &src, &p2, &p1, 1 );
}
else
#endif
{
/* Scale window to the screen clipped by the region being updated. */
CoreGraphicsStateClient_StretchBlit( state->client, &src, &dst, 1 );
}
/* Restore clipping region. */
dfb_state_set_clip( state, &old_clip );
}
void sawman_draw_cursor ( CoreWindowStack *stack,
CardState *state,
CoreSurface *surface,
DFBRegion *region,
int x,
int y )
{
DFBRectangle src;
DFBRectangle clip;
DFBSurfaceBlittingFlags flags = DSBLIT_BLEND_ALPHACHANNEL;
D_ASSERT( stack != NULL );
D_MAGIC_ASSERT( state, CardState );
DFB_REGION_ASSERT( region );
D_ASSUME( stack->cursor.opacity > 0 );
D_DEBUG_AT( SaWMan_Draw, "%s( %p, %d,%d-%dx%d )\n", __FUNCTION__,
stack, DFB_RECTANGLE_VALS_FROM_REGION( region ) );
/* Initialize source rectangle. */
src.x = region->x1 - x + stack->cursor.hot.x;
src.y = region->y1 - y + stack->cursor.hot.y;
src.w = region->x2 - region->x1 + 1;
src.h = region->y2 - region->y1 + 1;
D_DEBUG_AT( SaWMan_Draw, " -> cursor surface %p\n", stack->cursor.surface );
/* Initialize source clipping rectangle */
clip.x = clip.y = 0;
clip.w = stack->cursor.surface->config.size.w;
clip.h = stack->cursor.surface->config.size.h;
/* Intersect rectangles */
if (!dfb_rectangle_intersect( &src, &clip ))
return;
/* Set destination. */
if (surface) {
state->destination = surface;
state->modified |= SMF_DESTINATION;
}
/* Use global alpha blending. */
if (stack->cursor.opacity != 0xFF) {
flags |= DSBLIT_BLEND_COLORALPHA;
if (stack->cursor.surface->config.caps & DSCAPS_PREMULTIPLIED) {
/* Need to premultiply source with Ac? */
flags |= DSBLIT_SRC_PREMULTCOLOR;
dfb_state_set_src_blend( state, DSBF_ONE );
}
else
dfb_state_set_src_blend( state, DSBF_SRCALPHA );
/* Set opacity as blending factor. */
if (state->color.a != stack->cursor.opacity) {
state->color.a = stack->cursor.opacity;
state->modified |= SMF_COLOR;
}
}
/* Different compositing methods depending on destination format. */
if (flags & DSBLIT_BLEND_ALPHACHANNEL) {
if (DFB_PIXELFORMAT_HAS_ALPHA( state->destination->config.format )) {
/*
* Always use compliant Porter/Duff SRC_OVER,
* if the destination has an alpha channel.
*
* Cd = destination color (non-premultiplied)
* Ad = destination alpha
*
* Cs = source color (non-premultiplied)
* As = source alpha
*
* Ac = color alpha
*
* cd = Cd * Ad (premultiply destination)
* cs = Cs * As (premultiply source)
*
* The full equation to calculate resulting color and alpha (premultiplied):
*
* cx = cd * (1-As*Ac) + cs * Ac
* ax = Ad * (1-As*Ac) + As * Ac
*/
dfb_state_set_src_blend( state, DSBF_ONE );
/* Need to premultiply source with As*Ac or only with Ac? */
if (! (stack->cursor.surface->config.caps & DSCAPS_PREMULTIPLIED))
flags |= DSBLIT_SRC_PREMULTIPLY;
else if (flags & DSBLIT_BLEND_COLORALPHA)
flags |= DSBLIT_SRC_PREMULTCOLOR;
/* Need to premultiply/demultiply destination? */
// if (! (state->destination->caps & DSCAPS_PREMULTIPLIED))
// flags |= DSBLIT_DST_PREMULTIPLY | DSBLIT_DEMULTIPLY;
}
else {
/*
* We can avoid DSBLIT_SRC_PREMULTIPLY for destinations without an alpha channel
* by using another blending function, which is more likely that it's accelerated
* than premultiplication at this point in time.
*
* This way the resulting alpha (ax) doesn't comply with SRC_OVER,
* but as the destination doesn't have an alpha channel it's no problem.
*
* As the destination's alpha value is always 1.0 there's no need for
* premultiplication. The resulting alpha value will also be 1.0 without
* exceptions, therefore no need for demultiplication.
*
* cx = Cd * (1-As*Ac) + Cs*As * Ac (still same effect as above)
* ax = Ad * (1-As*Ac) + As*As * Ac (wrong, but discarded anyways)
*/
if (stack->cursor.surface->config.caps & DSCAPS_PREMULTIPLIED) {
/* Need to premultiply source with Ac? */
if (flags & DSBLIT_BLEND_COLORALPHA)
flags |= DSBLIT_SRC_PREMULTCOLOR;
dfb_state_set_src_blend( state, DSBF_ONE );
}
else
dfb_state_set_src_blend( state, DSBF_SRCALPHA );
}
}
/* Set blitting flags. */
dfb_state_set_blitting_flags( state, flags );
/* Set blitting source. */
state->source = stack->cursor.surface;
state->from_eye = DSSE_LEFT;
state->modified |= SMF_SOURCE | SMF_FROM;
/* Set clipping region. */
dfb_state_set_clip( state, region );
/* Blit from the window to the region being updated. */
DFBPoint point = {
region->x1, region->y1
};
D_DEBUG_AT( SaWMan_Draw, " -> client %p\n", state->client );
CoreGraphicsStateClient_Blit( state->client, &src, &point, 1 );
/* Reset blitting source. */
state->source = NULL;
state->modified |= SMF_SOURCE;
/* Reset destination. */
if (surface) {
state->destination = NULL;
state->modified |= SMF_DESTINATION;
}
}
