/**
* 将色彩类型为RGBA的前景图像，覆盖至色彩类型为RGB的目标背景图像中
* param back
* 背景图像
* param des_rect
* 背景图像中的写入区域
* param fore
* 前景图像
* param src_pos
* 前景图像中的读取区域的坐标
* warning
* 此函数不会对传入的参数进行有效性判断，因为此函数主要被Graph_Replace函
* 数调用，Graph_Replace函数会预先进行参数有效性判断
*/
static int Graph_RGBAReplaceRGB( LCUI_Graph *back,
LCUI_Rect des_rect,
LCUI_Graph *fore,
LCUI_Pos src_pos )
{
int x, y;
int src_n, des_n;
int des_row_start, src_row_start;
LCUI_Graph *src, *des;
src = Graph_GetQuote(fore);
des = Graph_GetQuote(back);
src_row_start = src_pos.y * src->w + src_pos.x;
des_row_start = des_rect.y * des->w + des_rect.x;
for(y=0; y<des_rect.height; ++y) {
des_n = des_row_start;
src_n = src_row_start;
for(x=0; x<des_rect.width; ++x) {
des->rgba[0][des_n] = _ALPHA_BLEND( src->rgba[0][src_n], 255, src->rgba[3][src_n] );
des->rgba[1][des_n] = _ALPHA_BLEND( src->rgba[1][src_n], 255, src->rgba[3][src_n] );
des->rgba[2][des_n] = _ALPHA_BLEND( src->rgba[2][src_n], 255, src->rgba[3][src_n] );
++src_n;
++des_n;
}
des_row_start += des->w;
src_row_start += src->w;
}
return 0;
}
static void CloseButton_OnUpdate( LCUI_Widget *widget )
{
LCUI_Graph img;
LCUI_Color color;
LCUI_Widget *wnd;
Graph_Init( &img );
LoadCloseButtonIMG( &img );
wnd = Widget_GetParent( widget, WIDGET_WINDOW );
if( wnd ) {
/* 若所在窗口并未获得焦点 */
if( !Widget_GetFocus(wnd) ) {
color = RGB(200,200,200);
} else {
LCUI_Window *wnd_data;
wnd_data = (LCUI_Window*)Widget_GetPrivateData( wnd );
color = wnd_data->theme_color;
}
} else {
color = RGB(255,0,0);
}
switch(widget->state) {
case WIDGET_STATE_NORMAL:
Graph_FillColor( &img, RGB(150,150,150) );
Widget_SetBackgroundImage( widget, &img );
Widget_SetBackgroundLayout( widget, LAYOUT_CENTER );
Widget_SetBackgroundTransparent( widget, TRUE );
break;
case WIDGET_STATE_ACTIVE:
color.red = _ALPHA_BLEND( 0, color.red, 100 );
color.green = _ALPHA_BLEND( 0, color.green, 100 );
color.blue = _ALPHA_BLEND( 0, color.blue, 100 );
Graph_FillColor( &img, RGB(255,255,255) );
Widget_SetBackgroundImage( widget, &img );
Widget_SetBackgroundColor( widget, color );
Widget_SetBackgroundLayout( widget, LAYOUT_CENTER );
Widget_SetBackgroundTransparent( widget, FALSE );
break;
case WIDGET_STATE_OVERLAY:
Graph_FillColor( &img, RGB(255,255,255) );
Widget_SetBackgroundImage( widget, &img );
Widget_SetBackgroundColor( widget, color );
Widget_SetBackgroundLayout( widget, LAYOUT_CENTER );
Widget_SetBackgroundTransparent( widget, FALSE );
case WIDGET_STATE_DISABLE:
default:break;
}
Graph_Free( &img );
}
/**
* 将色彩类型为RGBA的前景图像，覆盖至色彩类型为RGB的目标背景图像中
* 当背景图像没有alpha通道时，该函数使用白色背景与前景图像进行混合，并将源图像
* 的全局透明度计算在内
* param back
* 背景图像
* param des_rect
* 背景图像中的写入区域
* param fore
* 前景图像
* param src_pos
* 前景图像中的读取区域的坐标
* warning
* 此函数不会对传入的参数进行有效性判断，因为此函数主要被Graph_Replace函
* 数调用，Graph_Replace函数会预先进行参数有效性判断
*/
static int Graph_RGBAReplaceRGBWithGlobalAlpha( LCUI_Graph *back,
LCUI_Rect des_rect,
LCUI_Graph *fore,
LCUI_Pos src_pos )
{
int x, y;
double k;
uchar_t alpha;
int src_n, des_n;
int des_row_start, src_row_start;
LCUI_Graph *src, *des;
src = Graph_GetQuote(fore);
des = Graph_GetQuote(back);
k = 1.0 / src->alpha;
src_row_start = src_pos.y * src->w + src_pos.x;
des_row_start = des_rect.y * des->w + des_rect.x;
for(y=0; y<des_rect.height; ++y) {
des_n = des_row_start;
src_n = src_row_start;
for(x=0; x<des_rect.width; ++x) {
alpha = src->alpha * k;
des->rgba[0][des_n] = _ALPHA_BLEND( src->rgba[0][src_n], 255, alpha );
des->rgba[1][des_n] = _ALPHA_BLEND( src->rgba[1][src_n], 255, alpha );
des->rgba[2][des_n] = _ALPHA_BLEND( src->rgba[2][src_n], 255, alpha );
++src->w;
++des->w;
}
des_row_start += des->w;
src_row_start += src->w;
}
return 0;
}
static void Graph_RGBMixARGB( LCUI_Graph *des, LCUI_Rect des_rect,
const LCUI_Graph *src, LCUI_Pos src_pos )
{
int x, y;
uchar_t a;
LCUI_ARGB *px, *px_row;
uchar_t *rowbytep, *bytep;
/* 计算并保存第一行的首个像素的位置 */
px_row = src->argb + src_pos.y*src->w + src_pos.x;
rowbytep = des->bytes + des_rect.y*des->bytes_per_row;
rowbytep += des_rect.x*des->bytes_per_pixel;
if( src->opacity < 1.0 ) {
for( y=0; y<des_rect.h; ++y ) {
px = px_row;
bytep = rowbytep;
for( x=0; x<des_rect.w; ++x,++px ) {
a = px->a * src->opacity;
*bytep = _ALPHA_BLEND( *bytep, px->b, a );
++bytep;
*bytep = _ALPHA_BLEND( *bytep, px->g, a );
++bytep;
*bytep = _ALPHA_BLEND( *bytep, px->r, a );
++bytep;
}
rowbytep += des->bytes_per_row;
px_row += src->w;
}
}
for( y=0; y<des_rect.h; ++y ) {
px = px_row;
bytep = rowbytep;
for( x=0; x<des_rect.w; ++x,++px ) {
*bytep = _ALPHA_BLEND( *bytep, px->b, px->a );
++bytep;
*bytep = _ALPHA_BLEND( *bytep, px->g, px->a );
++bytep;
*bytep = _ALPHA_BLEND( *bytep, px->r, px->a );
++bytep;
}
rowbytep += des->bytes_per_row;
px_row += src->w;
}
}
