void
skin_scaler_scale( SkinScaler* scaler,
const SkinSurfacePixels* dst_pix,
const SkinSurfacePixelFormat* dst_format,
const SkinSurfacePixels* src_pix,
const SkinRect* src_rect)
{
ScaleOp op;
if ( !scaler->valid ) {
return;
}
{
op.scale = scaler->scale;
op.src_pitch = src_pix->pitch;
op.src_line = (uint8_t*)src_pix->pixels;
op.src_w = src_pix->w;
op.src_h = src_pix->h;
op.dst_pitch = dst_pix->pitch;
op.dst_line = (uint8_t*)dst_pix->pixels;
/* compute the destination rectangle */
skin_scaler_get_scaled_rect(scaler, src_rect, &op.rd);
/* compute the starting source position in 16.16 format
* and the corresponding increments */
op.sx = (int)((op.rd.pos.x - scaler->xdisp) * scaler->invscale * 65536);
op.sy = (int)((op.rd.pos.y - scaler->ydisp) * scaler->invscale * 65536);
op.ix = (int)( scaler->invscale * 65536 );
op.iy = op.ix;
op.dst_line += op.rd.pos.x * 4 + op.rd.pos.y * op.dst_pitch;
if (op.scale >= 0.5 && op.scale <= 1.0)
scale_05_to_10( &op );
else if (op.scale > 1.0)
scale_up_bilinear( &op );
else
scale_generic( &op );
}
// The optimized scale functions in argb.h assume the destination is ARGB.
// If that's not the case, do a channel reorder now.
if (dst_format->r_shift != 16 ||
dst_format->g_shift != 8 ||
dst_format->b_shift != 0)
{
uint32_t rshift = dst_format->r_shift;
uint32_t gshift = dst_format->g_shift;
uint32_t bshift = dst_format->b_shift;
uint32_t ashift = dst_format->a_shift;
uint32_t amask = dst_format->a_mask; // may be 0x00
int x, y;
for (y = 0; y < op.rd.size.h; y++)
{
uint32_t* line = (uint32_t*)(op.dst_line + y*op.dst_pitch);
for (x = 0; x < op.rd.size.w; x++) {
uint32_t r = (line[x] & 0x00ff0000) >> 16;
uint32_t g = (line[x] & 0x0000ff00) >> 8;
uint32_t b = (line[x] & 0x000000ff) >> 0;
uint32_t a = (line[x] & 0xff000000) >> 24;
line[x] = (r << rshift) | (g << gshift) | (b << bshift) |
((a << ashift) & amask);
}
}
}
void
skin_scaler_scale( SkinScaler* scaler,
SDL_Surface* dst_surface,
SDL_Surface* src_surface,
int sx,
int sy,
int sw,
int sh )
{
ScaleOp op;
if ( !scaler->valid )
return;
SDL_LockSurface( src_surface );
SDL_LockSurface( dst_surface );
{
op.scale = scaler->scale;
op.src_pitch = src_surface->pitch;
op.src_line = src_surface->pixels;
op.src_w = src_surface->w;
op.src_h = src_surface->h;
op.dst_pitch = dst_surface->pitch;
op.dst_line = dst_surface->pixels;
op.rd.x = (int)(sx * scaler->scale + scaler->xdisp);
op.rd.y = (int)(sy * scaler->scale + scaler->ydisp);
op.rd.w = (int)(ceil((sx + sw) * scaler->scale + scaler->xdisp)) - op.rd.x;
op.rd.h = (int)(ceil((sy + sh) * scaler->scale + scaler->ydisp)) - op.rd.y;
op.sx = (int)((op.rd.x - scaler->xdisp) * scaler->invscale * 65536);
op.sy = (int)((op.rd.y - scaler->ydisp) * scaler->invscale * 65536);
op.ix = (int)( scaler->invscale * 65536 );
op.iy = op.ix;
op.dst_line += op.rd.x*4 + op.rd.y*op.dst_pitch;
if (op.scale >= 0.5 && op.scale <= 1.0)
scale_05_to_10( &op );
else if (op.scale > 1.0)
scale_up_bilinear( &op );
else
scale_generic( &op );
}
if (dst_surface->format->Rshift != 16 ||
dst_surface->format->Gshift != 8 ||
dst_surface->format->Bshift != 0)
{
uint32_t rshift = dst_surface->format->Rshift;
uint32_t gshift = dst_surface->format->Gshift;
uint32_t bshift = dst_surface->format->Bshift;
uint32_t ashift = dst_surface->format->Ashift;
uint32_t amask = dst_surface->format->Amask;
int x, y;
for (y = 0; y < op.rd.h; y++)
{
uint32_t* line = (uint32_t*)(op.dst_line + y*op.dst_pitch);
for (x = 0; x < op.rd.w; x++) {
uint32_t r = (line[x] & 0x00ff0000) >> 16;
uint32_t g = (line[x] & 0x0000ff00) >> 8;
uint32_t b = (line[x] & 0x000000ff) >> 0;
uint32_t a = (line[x] & 0xff000000) >> 24;
line[x] = (r << rshift) | (g << gshift) | (b << bshift) |
((a << ashift) & amask);
}
}
}
