void
dfb_state_update_sources( CardState *state, CardStateFlags flags )
{
D_DEBUG_AT( Core_GfxState, "%s( %p )\n", __FUNCTION__, state );
D_MAGIC_ASSERT( state, CardState );
DFB_REGION_ASSERT( &state->clip );
if (D_FLAGS_IS_SET( state->flags & flags, CSF_SOURCE )) {
CoreSurface *source = state->source;
D_ASSERT( source != NULL );
if (direct_serial_update( &state->src_serial, &source->serial ))
state->modified |= SMF_SOURCE;
}
if (D_FLAGS_IS_SET( state->flags & flags, CSF_SOURCE_MASK )) {
CoreSurface *source_mask = state->source_mask;
D_ASSERT( source_mask != NULL );
if (direct_serial_update( &state->src_mask_serial, &source_mask->serial ))
state->modified |= SMF_SOURCE_MASK;
}
if (D_FLAGS_IS_SET( state->flags & flags, CSF_SOURCE2 )) {
CoreSurface *source2 = state->source2;
D_ASSERT( source2 != NULL );
if (direct_serial_update( &state->src2_serial, &source2->serial ))
state->modified |= SMF_SOURCE2;
}
}
void
dfb_updates_add( DFBUpdates *updates,
const DFBRegion *region )
{
int i;
D_MAGIC_ASSERT( updates, DFBUpdates );
DFB_REGION_ASSERT( region );
D_ASSERT( updates->regions != NULL );
D_ASSERT( updates->num_regions >= 0 );
D_ASSERT( updates->num_regions <= updates->max_regions );
D_DEBUG_AT( DFB_Updates, "%s( %p, %4d,%4d-%4dx%4d )\n", __FUNCTION__, (void*)updates,
DFB_RECTANGLE_VALS_FROM_REGION(region) );
if (updates->num_regions == 0) {
D_DEBUG_AT( DFB_Updates, " -> added as first\n" );
updates->regions[0] = updates->bounding = *region;
updates->num_regions = 1;
return;
}
for (i=0; i<updates->num_regions; i++) {
if (dfb_region_region_extends( &updates->regions[i], region ) ||
dfb_region_region_intersects( &updates->regions[i], region ))
{
D_DEBUG_AT( DFB_Updates, " -> combined with [%d] %4d,%4d-%4dx%4d\n", i,
DFB_RECTANGLE_VALS_FROM_REGION(&updates->regions[i]) );
dfb_region_region_union( &updates->regions[i], region );
dfb_region_region_union( &updates->bounding, region );
D_DEBUG_AT( DFB_Updates, " -> resulting in [%d] %4d,%4d-%4dx%4d\n", i,
DFB_RECTANGLE_VALS_FROM_REGION(&updates->regions[i]) );
return;
}
}
if (updates->num_regions == updates->max_regions) {
dfb_region_region_union( &updates->bounding, region );
updates->regions[0] = updates->bounding;
updates->num_regions = 1;
D_DEBUG_AT( DFB_Updates, " -> collapsing to [0] %4d,%4d-%4dx%4d\n",
DFB_RECTANGLE_VALS_FROM_REGION(&updates->regions[0]) );
}
else {
updates->regions[updates->num_regions++] = *region;
dfb_region_region_union( &updates->bounding, region );
D_DEBUG_AT( DFB_Updates, " -> added as [%d] %4d,%4d-%4dx%4d\n", updates->num_regions - 1,
DFB_RECTANGLE_VALS_FROM_REGION(&updates->regions[updates->num_regions - 1]) );
}
}
void
dfb_state_update_destination( CardState *state )
{
CoreSurface *destination;
D_DEBUG_AT( Core_GfxState, "%s( %p )\n", __FUNCTION__, state );
D_MAGIC_ASSERT( state, CardState );
DFB_REGION_ASSERT( &state->clip );
destination = state->destination;
if (D_FLAGS_IS_SET( state->flags, CSF_DESTINATION )) {
D_DEBUG_AT( Core_GfxState, " -> CSF_DESTINATION is set\n" );
D_ASSERT( destination != NULL );
if (direct_serial_update( &state->dst_serial, &destination->serial )) {
D_DEBUG_AT( Core_GfxState, " -> serial is updated\n" );
validate_clip( state, destination->config.size.w - 1, destination->config.size.h - 1, true );
state->modified |= SMF_DESTINATION;
}
}
else if (destination)
validate_clip( state, destination->config.size.w - 1, destination->config.size.h - 1, true );
}
void
dfb_gfx_copy_regions_stereo( CoreSurface *source,
CoreSurfaceBufferRole from,
DFBSurfaceStereoEye source_eye,
CoreSurface *destination,
CoreSurfaceBufferRole to,
DFBSurfaceStereoEye destination_eye,
const DFBRegion *regions,
unsigned int num,
int x,
int y )
{
unsigned int i, n = 0;
DFBRectangle rect = { 0, 0, source->config.size.w, source->config.size.h };
DFBRectangle rects[num];
DFBPoint points[num];
D_ASSERT( !dfb_config->task_manager );
for (i=0; i<num; i++) {
DFB_REGION_ASSERT( ®ions[i] );
rects[n] = DFB_RECTANGLE_INIT_FROM_REGION( ®ions[i] );
if (dfb_rectangle_intersect( &rects[n], &rect )) {
points[n].x = x + rects[n].x - rect.x;
points[n].y = y + rects[n].y - rect.y;
n++;
}
}
if (n > 0) {
StateClient *client = state_client_tls.Get();
D_FLAGS_SET( client->state.modified, SMF_CLIP | SMF_SOURCE | SMF_DESTINATION | SMF_FROM | SMF_TO );
client->state.clip.x2 = destination->config.size.w - 1;
client->state.clip.y2 = destination->config.size.h - 1;
client->state.source = source;
client->state.destination = destination;
client->state.from = from;
client->state.from_eye = source_eye;
client->state.to = to;
client->state.to_eye = destination_eye;
CoreGraphicsStateClient_Blit( &client->client, rects, points, n );
CoreGraphicsStateClient_Flush( &client->client, 0, CGSCFF_NONE );
/* Signal end of sequence. */
dfb_state_stop_drawing( &client->state );
client->state.destination = NULL;
client->state.source = NULL;
}
}
void
dfb_gfx_copy_regions( CoreSurface *source,
CoreSurfaceBufferRole from,
CoreSurface *destination,
CoreSurfaceBufferRole to,
const DFBRegion *regions,
unsigned int num,
int x,
int y )
{
unsigned int i, n = 0;
DFBRectangle rect = { 0, 0, source->config.size.w, source->config.size.h };
DFBRectangle rects[num];
DFBPoint points[num];
for (i=0; i<num; i++) {
DFB_REGION_ASSERT( ®ions[i] );
rects[n] = DFB_RECTANGLE_INIT_FROM_REGION( ®ions[i] );
if (dfb_rectangle_intersect( &rects[n], &rect )) {
points[n].x = x + rects[n].x - rect.x;
points[n].y = y + rects[n].y - rect.y;
n++;
}
}
if (n > 0) {
pthread_mutex_lock( ©_lock );
if (!copy_state_inited) {
dfb_state_init( ©_state, NULL );
copy_state_inited = true;
}
copy_state.modified |= SMF_CLIP | SMF_SOURCE | SMF_DESTINATION;
copy_state.clip.x2 = destination->config.size.w - 1;
copy_state.clip.y2 = destination->config.size.h - 1;
copy_state.source = source;
copy_state.destination = destination;
copy_state.from = from;
copy_state.to = to;
dfb_gfxcard_batchblit( rects, points, n, ©_state );
/* Signal end of sequence. */
dfb_state_stop_drawing( ©_state );
pthread_mutex_unlock( ©_lock );
}
}
void
dfb_state_update( CardState *state, bool update_sources )
{
CoreSurface *destination;
D_MAGIC_ASSERT( state, CardState );
DFB_REGION_ASSERT( &state->clip );
destination = state->destination;
if (D_FLAGS_IS_SET( state->flags, CSF_DESTINATION )) {
D_ASSERT( destination != NULL );
if (direct_serial_update( &state->dst_serial, &destination->serial )) {
validate_clip( state, destination->config.size.w - 1, destination->config.size.h - 1, true );
state->modified |= SMF_DESTINATION;
}
}
else if (destination)
validate_clip( state, destination->config.size.w - 1, destination->config.size.h - 1, true );
if (update_sources && D_FLAGS_IS_SET( state->flags, CSF_SOURCE )) {
CoreSurface *source = state->source;
D_ASSERT( source != NULL );
if (direct_serial_update( &state->src_serial, &source->serial ))
state->modified |= SMF_SOURCE;
}
if (update_sources && D_FLAGS_IS_SET( state->flags, CSF_SOURCE_MASK )) {
CoreSurface *source_mask = state->source_mask;
D_ASSERT( source_mask != NULL );
if (direct_serial_update( &state->src_mask_serial, &source_mask->serial ))
state->modified |= SMF_SOURCE_MASK;
}
if (update_sources && D_FLAGS_IS_SET( state->flags, CSF_SOURCE2 )) {
CoreSurface *source2 = state->source2;
D_ASSERT( source2 != NULL );
if (direct_serial_update( &state->src2_serial, &source2->serial ))
state->modified |= SMF_SOURCE2;
}
}
void
dfb_updates_add( DFBUpdates *updates,
const DFBRegion *region )
{
int i;
D_MAGIC_ASSERT( updates, DFBUpdates );
DFB_REGION_ASSERT( region );
D_ASSERT( updates->regions != NULL );
D_ASSERT( updates->num_regions >= 0 );
D_ASSERT( updates->num_regions <= updates->max_regions );
if (updates->num_regions == 0) {
updates->regions[0] = updates->bounding = *region;
updates->num_regions = 1;
return;
}
for (i=0; i<updates->num_regions; i++) {
DFBRegion inter = updates->regions[i];
if (dfb_region_region_intersect( &inter, region )) {
DFBRegion uni = updates->regions[i];
dfb_region_region_union( &uni, region );
updates->regions[i] = uni;
dfb_region_region_union( &updates->bounding, &uni );
return;
}
}
if (updates->num_regions == updates->max_regions) {
dfb_region_region_union( &updates->bounding, region );
updates->regions[0] = updates->bounding;
updates->num_regions = 1;
}
else {
updates->regions[updates->num_regions++] = *region;
dfb_region_region_union( &updates->bounding, region );
}
}
static DFBResult
dfb_x11_update_screen( DFBX11 *x11, const DFBRegion *region, CoreSurfaceBufferLock *lock )
{
int ret;
DFBX11Shared *shared = x11->shared;
DFB_REGION_ASSERT( region );
D_ASSERT( lock != NULL );
/* FIXME: Just a hot fix! */
while (shared->update.lock)
usleep( 10000 );
shared->update.region = *region;
shared->update.lock = lock;
if (fusion_call_execute( &shared->call, FCEF_NONE, X11_UPDATE_SCREEN, &shared->update, &ret ))
return DFB_FUSION;
return ret;
}
static inline void
validate_clip( CardState *state,
int xmax,
int ymax,
bool warn )
{
D_DEBUG_AT( Core_GfxState, "%s( %p, %d, %d, %d )\n", __FUNCTION__, state, xmax, ymax, warn );
D_MAGIC_ASSERT( state, CardState );
DFB_REGION_ASSERT( &state->clip );
D_ASSERT( xmax >= 0 );
D_ASSERT( ymax >= 0 );
D_ASSERT( state->clip.x1 <= state->clip.x2 );
D_ASSERT( state->clip.y1 <= state->clip.y2 );
if (state->clip.x1 <= xmax &&
state->clip.y1 <= ymax &&
state->clip.x2 <= xmax &&
state->clip.y2 <= ymax)
return;
if (warn)
D_WARN( "Clip %d,%d-%dx%d invalid, adjusting to fit %dx%d",
DFB_RECTANGLE_VALS_FROM_REGION( &state->clip ), xmax+1, ymax+1 );
if (state->clip.x1 > xmax)
state->clip.x1 = xmax;
if (state->clip.y1 > ymax)
state->clip.y1 = ymax;
if (state->clip.x2 > xmax)
state->clip.x2 = xmax;
if (state->clip.y2 > ymax)
state->clip.y2 = ymax;
state->modified |= SMF_CLIP;
}
static DFBResult
wm_update_stack( CoreWindowStack *stack,
void *wm_data,
void *stack_data,
const DFBRegion *region,
DFBSurfaceFlipFlags flags )
{
StackData *data = stack_data;
D_ASSERT( stack != NULL );
D_ASSERT( wm_data != NULL );
D_ASSERT( stack_data != NULL );
DFB_REGION_ASSERT( region );
D_MAGIC_ASSERT( data, StackData );
if (!data->context)
return DFB_DESTROYED;
return unique_context_update( data->context, region, 1, flags );
}
void
dfb_gfx_copy_regions_client( CoreSurface *source,
CoreSurfaceBufferRole from,
DFBSurfaceStereoEye source_eye,
CoreSurface *destination,
CoreSurfaceBufferRole to,
DFBSurfaceStereoEye destination_eye,
const DFBRegion *regions,
unsigned int num,
int x,
int y,
CoreGraphicsStateClient *_client )
{
unsigned int i, n = 0;
DFBRectangle rect = { 0, 0, source->config.size.w, source->config.size.h };
DFBRectangle rects[num];
DFBPoint points[num];
CoreGraphicsStateClient *client = _client ? _client : &state_client_tls.Get()->client;
CardState *state = client->state;
CardState backup;
for (i=0; i<num; i++) {
DFB_REGION_ASSERT( ®ions[i] );
rects[n] = DFB_RECTANGLE_INIT_FROM_REGION( ®ions[i] );
if (dfb_rectangle_intersect( &rects[n], &rect )) {
points[n].x = x + rects[n].x;
points[n].y = y + rects[n].y;
n++;
}
}
if (n > 0) {
backup.clip = state->clip;
backup.source = state->source;
backup.destination = state->destination;
backup.from = state->from;
backup.from_eye = state->from_eye;
backup.to = state->to;
backup.to_eye = state->to_eye;
backup.blittingflags = state->blittingflags;
D_FLAGS_SET( state->modified, SMF_CLIP | SMF_SOURCE | SMF_DESTINATION | SMF_FROM | SMF_TO | SMF_BLITTING_FLAGS );
state->clip.x1 = 0;
state->clip.y1 = 0;
state->clip.x2 = destination->config.size.w - 1;
state->clip.y2 = destination->config.size.h - 1;
state->source = source;
state->destination = destination;
state->from = from;
state->from_eye = source_eye;
state->to = to;
state->to_eye = destination_eye;
state->blittingflags = DSBLIT_NOFX;
CoreGraphicsStateClient_Blit( client, rects, points, n );
if (!_client)
CoreGraphicsStateClient_Flush( client, 0, CGSCFF_NONE );
D_FLAGS_SET( state->modified, SMF_CLIP | SMF_SOURCE | SMF_DESTINATION | SMF_FROM | SMF_TO | SMF_BLITTING_FLAGS );
state->clip = backup.clip;
state->source = backup.source;
state->destination = backup.destination;
state->from = backup.from;
state->from_eye = backup.from_eye;
state->to = backup.to;
state->to_eye = backup.to_eye;
state->blittingflags = backup.blittingflags;
}
}
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;
}
}