DFBResult
IGraphicsState_Real__SetClip(
CoreGraphicsState *obj,
const DFBRegion *region
)
{
D_DEBUG_AT( DirectFB_CoreGraphicsState, "%s()\n", __FUNCTION__ );
D_ASSERT( region != NULL );
dfb_state_set_clip( &obj->state, region );
return DFB_OK;
}
static void
foo_update( StretRegion *region,
void *region_data,
void *update_data,
unsigned long arg,
int x,
int y,
const DFBRegion *updates,
int num )
{
int i;
DFBRegion clip;
DFBDimension size;
bool visible;
WMShared *shared;
UniqueContext *context;
UniqueWindow *window = region_data;
CardState *state = update_data;
DFBSurfaceBlittingFlags flags = DSBLIT_NOFX;
D_ASSERT( region != NULL );
D_ASSERT( region_data != NULL );
D_ASSERT( update_data != NULL );
D_ASSERT( updates != NULL );
D_MAGIC_ASSERT( window, UniqueWindow );
D_MAGIC_ASSERT( state, CardState );
shared = window->shared;
D_MAGIC_ASSERT( shared, WMShared );
D_ASSERT( shared->foo_surface != NULL );
context = window->context;
D_MAGIC_ASSERT( context, UniqueContext );
visible = D_FLAGS_IS_SET( window->flags, UWF_VISIBLE );
D_DEBUG_AT( UniQuE_Foo, "foo_update( region %p, window %p, visible %s, num %d )\n",
region, window, visible ? "yes" : "no", num );
#if D_DEBUG_ENABLED
for (i=0; i<num; i++) {
D_DEBUG_AT( UniQuE_Foo, " (%d) %4d,%4d - %4dx%4d\n",
i, DFB_RECTANGLE_VALS_FROM_REGION( &updates[i] ) );
}
#endif
if (!visible)
return;
stret_region_get_size( region, &size );
/* Use per pixel alpha blending. */
flags |= DSBLIT_BLEND_ALPHACHANNEL;
/* Use global alpha blending. */
if (window->opacity != 0xFF) {
flags |= DSBLIT_BLEND_COLORALPHA;
/* Set opacity as blending factor. */
if (state->color.a != window->opacity) {
state->color.a = window->opacity;
state->modified |= SMF_COLOR;
}
}
/* Use colorizing if the color is not white. */
if (context->color.r != 0xff || context->color.g != 0xff || context->color.b != 0xff) {
flags |= DSBLIT_COLORIZE;
state->color.r = context->color.r;
state->color.g = context->color.g;
state->color.b = context->color.b;
state->modified |= SMF_COLOR;
}
/* Set blitting flags. */
dfb_state_set_blitting_flags( state, flags );
/* Set blitting source. */
state->source = shared->foo_surface;
state->modified |= SMF_SOURCE;
switch (arg) {
case UFI_N:
case UFI_E:
case UFI_S:
case UFI_W:
clip = state->clip;
/* for (i=0; i<num; i++) {
DFBRegion update = DFB_REGION_INIT_TRANSLATED( &updates[i], x, y );
DFBRectangle source = shared->foo_rects[arg];
DFBRectangle dest = { x, y, size.w, size.h };
dfb_state_set_clip( state, &update );
dfb_gfxcard_stretchblit( &source, &dest, state );
}*/
for (i=0; i<num; i++) {
DFBRegion update = DFB_REGION_INIT_TRANSLATED( &updates[i], x, y );
DFBRectangle source = shared->foo_rects[arg];
dfb_state_set_clip( state, &update );
dfb_gfxcard_tileblit( &source, x, y, x + size.w - 1, y + size.h - 1, state );
}
dfb_state_set_clip( state, &clip );
break;
case UFI_NE:
case UFI_SE:
case UFI_SW:
case UFI_NW:
for (i=0; i<num; i++) {
DFBRectangle rect = DFB_RECTANGLE_INIT_FROM_REGION( &updates[i] );
dfb_rectangle_translate( &rect, shared->foo_rects[arg].x, shared->foo_rects[arg].y );
dfb_gfxcard_blit( &rect, x + updates[i].x1, y + updates[i].y1, state );
}
break;
default:
D_BUG( "invalid arg" );
}
/* Reset blitting source. */
state->source = NULL;
state->modified |= SMF_SOURCE;
}
/* HACK: implementation dumped in here for now, will move into context */
static DFBResult
wm_update_cursor( CoreWindowStack *stack,
void *wm_data,
void *stack_data,
CoreCursorUpdateFlags flags )
{
DFBResult ret;
DFBRegion old_region;
WMData *wmdata = wm_data;
StackData *data = stack_data;
bool restored = false;
CoreLayer *layer;
CoreLayerRegion *region;
CardState *state;
CoreSurface *surface;
UniqueContext *context;
D_ASSERT( stack != NULL );
D_ASSERT( stack->context != NULL );
D_ASSERT( wm_data != NULL );
D_ASSERT( stack_data != NULL );
D_MAGIC_ASSERT( data, StackData );
context = data->context;
D_MAGIC_ASSERT( context, UniqueContext );
/* Optimize case of invisible cursor moving. */
if (!(flags & ~(CCUF_POSITION | CCUF_SHAPE)) && (!stack->cursor.opacity || !stack->cursor.enabled)) {
context->cursor_bs_valid = false;
return DFB_OK;
}
layer = dfb_layer_at( context->layer_id );
state = &layer->state;
region = context->region;
surface = context->surface;
D_ASSERT( region != NULL );
D_ASSERT( surface != NULL );
if (flags & CCUF_ENABLE) {
CoreSurface *cursor_bs;
DFBSurfaceCapabilities caps = DSCAPS_NONE;
dfb_surface_caps_apply_policy( stack->cursor.policy, &caps );
D_ASSERT( context->cursor_bs == NULL );
/* Create the cursor backing store surface. */
ret = dfb_surface_create_simple( wmdata->core, stack->cursor.size.w, stack->cursor.size.h,
region->config.format, region->config.colorspace,
caps, CSTF_SHARED | CSTF_CURSOR,
0, /* FIXME: no shared cursor objects, no cursor id */
NULL, &cursor_bs );
if (ret) {
D_ERROR( "WM/Default: Failed creating backing store for cursor!\n" );
return ret;
}
ret = dfb_surface_globalize( cursor_bs );
D_ASSERT( ret == DFB_OK );
/* Ensure valid back buffer for now.
* FIXME: Keep a flag to know when back/front have been swapped and need a sync.
*/
switch (region->config.buffermode) {
case DLBM_BACKVIDEO:
case DLBM_TRIPLE:
dfb_gfx_copy( surface, surface, NULL );
break;
default:
break;
}
context->cursor_bs = cursor_bs;
}
else {
D_ASSERT( context->cursor_bs != NULL );
/* restore region under cursor */
if (context->cursor_drawn) {
DFBRectangle rect = { 0, 0,
context->cursor_region.x2 - context->cursor_region.x1 + 1,
context->cursor_region.y2 - context->cursor_region.y1 + 1 };
D_ASSERT( stack->cursor.opacity || (flags & CCUF_OPACITY) );
D_ASSERT( context->cursor_bs_valid );
dfb_gfx_copy_to( context->cursor_bs, surface, &rect,
context->cursor_region.x1, context->cursor_region.y1, false );
context->cursor_drawn = false;
old_region = context->cursor_region;
restored = true;
}
if (flags & CCUF_SIZE) {
ret = dfb_surface_reformat( context->cursor_bs,
stack->cursor.size.w, stack->cursor.size.h,
context->cursor_bs->config.format );
if (ret) {
D_ERROR( "WM/Default: Failed resizing backing store for cursor!\n" );
return ret;
}
}
}
if (flags & (CCUF_ENABLE | CCUF_POSITION | CCUF_SIZE | CCUF_OPACITY)) {
context->cursor_bs_valid = false;
context->cursor_region.x1 = stack->cursor.x - stack->cursor.hot.x;
context->cursor_region.y1 = stack->cursor.y - stack->cursor.hot.y;
context->cursor_region.x2 = context->cursor_region.x1 + stack->cursor.size.w - 1;
context->cursor_region.y2 = context->cursor_region.y1 + stack->cursor.size.h - 1;
if (!dfb_region_intersect( &context->cursor_region, 0, 0, stack->width - 1, stack->height - 1 )) {
D_BUG( "invalid cursor region" );
return DFB_BUG;
}
}
D_ASSERT( context->cursor_bs != NULL );
if (flags & CCUF_DISABLE) {
dfb_surface_unlink( &context->cursor_bs );
}
else if (stack->cursor.opacity) {
/* backup region under cursor */
if (!context->cursor_bs_valid) {
DFBRectangle rect = DFB_RECTANGLE_INIT_FROM_REGION( &context->cursor_region );
D_ASSERT( !context->cursor_drawn );
/* FIXME: this requires using blitted flipping all the time,
but fixing it seems impossible, for now DSFLIP_BLIT is forced
in repaint_stack() when the cursor is enabled. */
dfb_gfx_copy_to( surface, context->cursor_bs, &rect, 0, 0, true );
context->cursor_bs_valid = true;
}
/* Set destination. */
state->destination = surface;
state->modified |= SMF_DESTINATION;
/* Set clipping region. */
dfb_state_set_clip( state, &context->cursor_region );
/* draw cursor */
unique_draw_cursor( stack, context, state, &context->cursor_region );
/* Reset destination. */
state->destination = NULL;
state->modified |= SMF_DESTINATION;
context->cursor_drawn = true;
if (restored) {
if (dfb_region_region_intersects( &old_region, &context->cursor_region ))
dfb_region_region_union( &old_region, &context->cursor_region );
else
dfb_layer_region_flip_update( region, &context->cursor_region, DSFLIP_BLIT );
dfb_layer_region_flip_update( region, &old_region, DSFLIP_BLIT );
}
else
dfb_layer_region_flip_update( region, &context->cursor_region, DSFLIP_BLIT );
}
else if (restored)
dfb_layer_region_flip_update( region, &old_region, DSFLIP_BLIT );
return DFB_OK;
}
static void
root_update( StretRegion *region,
void *region_data,
void *update_data,
unsigned long arg,
int x,
int y,
const DFBRegion *updates,
int num )
{
int i;
CoreWindowStack *stack;
UniqueContext *context = region_data;
CardState *state = update_data;
D_ASSERT( region != NULL );
D_ASSERT( region_data != NULL );
D_ASSERT( update_data != NULL );
D_ASSERT( updates != NULL );
D_ASSERT( x == 0 );
D_ASSERT( y == 0 );
D_MAGIC_ASSERT( context, UniqueContext );
D_MAGIC_ASSERT( state, CardState );
stack = context->stack;
D_ASSERT( stack != NULL );
D_ASSERT( stack->bg.image != NULL || (stack->bg.mode != DLBM_IMAGE &&
stack->bg.mode != DLBM_TILE) );
D_DEBUG_AT( UniQuE_Root, "root_update( region %p, num %d )\n", region, num );
#if D_DEBUG_ENABLED
for (i=0; i<num; i++) {
D_DEBUG_AT( UniQuE_Root, " (%d) %4d,%4d - %4dx%4d\n",
i, DFB_RECTANGLE_VALS_FROM_REGION( &updates[i] ) );
}
#endif
switch (stack->bg.mode) {
case DLBM_COLOR: {
CoreSurface *dest = state->destination;
DFBColor *color = &stack->bg.color;
DFBRectangle rects[num];
/* Set the background color. */
if (DFB_PIXELFORMAT_IS_INDEXED( dest->config.format ))
dfb_state_set_color_index( state,
dfb_palette_search( dest->palette, color->r,
color->g, color->b, color->a ) );
else
dfb_state_set_color( state, color );
for (i=0; i<num; i++)
dfb_rectangle_from_region( &rects[i], &updates[i] );
/* Simply fill the background. */
dfb_gfxcard_fillrectangles( rects, num, state );
break;
}
case DLBM_IMAGE: {
CoreSurface *bg = stack->bg.image;
/* Set blitting source. */
state->source = bg;
state->modified |= SMF_SOURCE;
/* Set blitting flags. */
dfb_state_set_blitting_flags( state, DSBLIT_NOFX );
/* Check the size of the background image. */
if (bg->config.size.w == stack->width && bg->config.size.h == stack->height) {
for (i=0; i<num; i++) {
DFBRectangle dst = DFB_RECTANGLE_INIT_FROM_REGION( &updates[i] );
/* Simple blit for 100% fitting background image. */
dfb_gfxcard_blit( &dst, dst.x, dst.y, state );
}
}
else {
DFBRegion clip = state->clip;
for (i=0; i<num; i++) {
DFBRectangle src = { 0, 0, bg->config.size.w, bg->config.size.h };
DFBRectangle dst = { 0, 0, stack->width, stack->height };
/* Change clipping region. */
dfb_state_set_clip( state, &updates[i] );
/* Stretch blit for non fitting background images. */
dfb_gfxcard_stretchblit( &src, &dst, state );
}
/* Restore clipping region. */
dfb_state_set_clip( state, &clip );
}
/* Reset blitting source. */
state->source = NULL;
state->modified |= SMF_SOURCE;
break;
}
case DLBM_TILE: {
CoreSurface *bg = stack->bg.image;
DFBRegion clip = state->clip;
/* Set blitting source. */
state->source = bg;
state->modified |= SMF_SOURCE;
/* Set blitting flags. */
dfb_state_set_blitting_flags( state, DSBLIT_NOFX );
for (i=0; i<num; i++) {
DFBRectangle src = { 0, 0, bg->config.size.w, bg->config.size.h };
/* Change clipping region. */
dfb_state_set_clip( state, &updates[i] );
/* Tiled blit (aligned). */
dfb_gfxcard_tileblit( &src, 0, 0, stack->width, stack->height, state );
}
/* Restore clipping region. */
dfb_state_set_clip( state, &clip );
/* Reset blitting source. */
state->source = NULL;
state->modified |= SMF_SOURCE;
break;
}
case DLBM_DONTCARE:
break;
default:
D_BUG( "unknown background mode" );
break;
}
}
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 );
}
static void
draw_border( SaWManWindow *sawwin,
CardState *state,
const DFBRegion *region,
int thickness,
bool right_eye )
{
int i;
DFBRegion old_clip;
DFBRectangle rects[thickness];
CoreWindow *window;
const SaWManBorderInit *border;
const DFBColor *colors;
const int *indices;
unsigned int num_colors;
unsigned int num_indices;
int offset;
window = sawwin->window;
D_ASSERT( window != NULL );
D_DEBUG_AT( SaWMan_Draw, "%s( %p, %p, %d,%d-%dx%d, %d )\n", __FUNCTION__,
sawwin, state, DFB_RECTANGLE_VALS_FROM_REGION( region ), thickness );
if (thickness > sawwin->bounds.w / 2)
thickness = sawwin->bounds.w / 2;
if (thickness > sawwin->bounds.h / 2)
thickness = sawwin->bounds.h / 2;
/* Check thickness. */
if (thickness < 1)
return;
/* Initialize border rectangles. */
rects[0] = sawwin->bounds;
/* Translate for stereo effect. */
offset = window->config.z;
offset *= right_eye ? -1 : 1;
dfb_rectangle_translate( &rects[0], offset, 0 );
for (i=1; i<thickness; i++) {
rects[i].x = rects[i-1].x + 1;
rects[i].y = rects[i-1].y + 1;
rects[i].w = rects[i-1].w - 2;
rects[i].h = rects[i-1].h - 2;
}
/* Save clipping region. */
old_clip = state->clip;
/* Change clipping region. */
dfb_state_set_clip( state, region );
border = &sawman_config->borders[sawman_window_priority(sawwin)];
if (window->flags & CWF_FOCUSED) {
colors = border->focused;
indices = border->focused_index;
num_colors = D_ARRAY_SIZE(border->focused);
num_indices = D_ARRAY_SIZE(border->focused_index);
}
else {
colors = border->unfocused;
indices = border->unfocused_index;
num_colors = D_ARRAY_SIZE(border->unfocused);
num_indices = D_ARRAY_SIZE(border->unfocused_index);
}
/* Draw border rectangles. */
for (i=0; i<thickness; i++) {
dfb_state_set_color_or_index( state,
&colors[i*num_colors/thickness],
indices[i*num_indices/thickness] );
CoreGraphicsStateClient_DrawRectangles( state->client, &rects[i], 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;
}
}
