memset (data()[0], 0, sample_size(0).height * stride()[0]);
}
-template <class T>
-void
-component (
- int n,
- Image* base,
- shared_ptr<const Image> other,
- shared_ptr<const Image> rgba,
- int start_base_x, int start_base_y,
- int start_other_x, int start_other_y
- )
-{
- dcp::Size const base_size = base->sample_size(n);
- dcp::Size const other_size = other->sample_size(n);
- for (int by = start_base_y, oy = start_other_y; by < base_size.height && oy < other_size.height; ++by, ++oy) {
- /* base image */
- T* bp = ((T*) (base->data()[n] + by * base->stride()[n])) + start_base_x;
- /* overlay image */
- T* op = ((T*) (other->data()[n] + oy * other->stride()[n]));
- /* original RGBA for alpha channel */
- uint8_t* rp = rgba->data()[0] + oy * rgba->stride()[0];
- for (int bx = start_base_x, ox = start_other_x; bx < base_size.width && ox < other_size.width; ++bx, ++ox) {
- float const alpha = float (rp[3]) / 255;
- *bp = *op * alpha + *bp * (1 - alpha);
- ++bp;
- ++op;
- rp += 4;
- }
- }
-}
-
void
Image::alpha_blend (shared_ptr<const Image> other, Position<int> position)
{
case AV_PIX_FMT_YUV420P:
{
shared_ptr<Image> yuv = other->convert_pixel_format (dcp::YUV_TO_RGB_REC709, _pixel_format, false, false);
- component<uint8_t> (0, this, yuv, other, start_tx, start_ty, start_ox, start_oy);
- component<uint8_t> (1, this, yuv, other, start_tx, start_ty, start_ox, start_oy);
- component<uint8_t> (2, this, yuv, other, start_tx, start_ty, start_ox, start_oy);
+ dcp::Size const ts = size();
+ dcp::Size const os = yuv->size();
+ for (int ty = start_ty, oy = start_oy; ty < ts.height && oy < os.height; ++ty, ++oy) {
+ int const hty = ty / 2;
+ int const hoy = oy / 2;
+ uint8_t* tY = data()[0] + (ty * stride()[0]) + start_tx;
+ uint8_t* tU = data()[1] + (hty * stride()[1]) + start_tx / 2;
+ uint8_t* tV = data()[2] + (hty * stride()[2]) + start_tx / 2;
+ uint8_t* oY = yuv->data()[0] + (oy * yuv->stride()[0]) + start_ox;
+ uint8_t* oU = yuv->data()[1] + (hoy * yuv->stride()[1]) + start_ox / 2;
+ uint8_t* oV = yuv->data()[2] + (hoy * yuv->stride()[2]) + start_ox / 2;
+ uint8_t* alpha = other->data()[0] + (oy * other->stride()[0]) + start_ox * 4;
+ for (int tx = start_tx, ox = start_ox; tx < ts.width && ox < os.width; ++tx, ++ox) {
+ float const a = float(alpha[3]) / 255;
+ *tY = *oY * a + *tY * (1 - a);
+ *tU = *oU * a + *tU * (1 - a);
+ *tV = *oV * a + *tV * (1 - a);
+ ++tY;
+ ++oY;
+ if (tx % 2) {
+ ++tU;
+ ++tV;
+ }
+ if (ox % 2) {
+ ++oU;
+ ++oV;
+ }
+ alpha += 4;
+ }
+ }
break;
}
case AV_PIX_FMT_YUV420P10:
case AV_PIX_FMT_YUV422P10LE:
{
shared_ptr<Image> yuv = other->convert_pixel_format (dcp::YUV_TO_RGB_REC709, _pixel_format, false, false);
- component<uint16_t> (0, this, yuv, other, start_tx, start_ty, start_ox, start_oy);
- component<uint8_t> (1, this, yuv, other, start_tx, start_ty, start_ox, start_oy);
- component<uint8_t> (2, this, yuv, other, start_tx, start_ty, start_ox, start_oy);
+ dcp::Size const ts = size();
+ dcp::Size const os = yuv->size();
+ for (int ty = start_ty, oy = start_oy; ty < ts.height && oy < os.height; ++ty, ++oy) {
+ uint16_t* tY = (uint16_t *) (data()[0] + (ty * stride()[0])) + start_tx;
+ uint8_t* tU = data()[1] + (ty * stride()[1]) + start_tx;
+ uint8_t* tV = data()[2] + (ty * stride()[2]) + start_tx;
+ uint16_t* oY = (uint16_t *) (yuv->data()[0] + (oy * yuv->stride()[0])) + start_ox;
+ uint8_t* oU = yuv->data()[1] + (oy * yuv->stride()[1]) + start_ox;
+ uint8_t* oV = yuv->data()[2] + (oy * yuv->stride()[2]) + start_ox;
+ uint8_t* alpha = other->data()[0] + (oy * other->stride()[0]) + start_ox * 4;
+ for (int tx = start_tx, ox = start_ox; tx < ts.width && ox < os.width; ++tx, ++ox) {
+ float const a = float(alpha[3]) / 255;
+ *tY = *oY * a + *tY * (1 - a);
+ *tU = *oU * a + *tU * (1 - a);
+ *tV = *oV * a + *tV * (1 - a);
+ ++tY;
+ ++tU;
+ ++tV;
+ ++oY;
+ ++oU;
+ ++oV;
+ alpha += 4;
+ }
+ }
break;
}
default: