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python: Use transfer object to read from a surface.

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This commit is contained in:
Michal Krol
2009-03-16 16:48:18 +01:00
parent fcf93aa06d
commit d8445e8fe1
1 changed files with 32 additions and 16 deletions
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48
src/gallium/state_trackers/python/st_sample.c
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@@ -524,26 +524,42 @@ st_sample_pixel_block(enum pipe_format format,
void
st_sample_surface(struct pipe_surface *surface, float *rgba)
{
const struct pipe_format_block *block = &surface->block;
unsigned rgba_stride = surface->width*4;
struct pipe_screen *screen = surface->texture->screen;
uint rgba_stride = surface->width * 4;
struct pipe_transfer *transfer;
void *raw;
unsigned x, y;
raw = pipe_surface_map(surface, PIPE_BUFFER_USAGE_CPU_READ);
if(!raw)
transfer = screen->get_tex_transfer(screen,
surface->texture,
surface->face,
surface->level,
surface->zslice,
PIPE_TRANSFER_READ,
0, 0,
surface->width,
surface->height);
if (!transfer)
return;
for (y = 0; y < surface->nblocksy; ++y) {
for(x = 0; x < surface->nblocksx; ++x) {
st_sample_pixel_block(surface->format,
block,
(uint8_t*)raw + y*surface->stride + x*block->size,
rgba + y*block->height*rgba_stride + x*block->width*4,
rgba_stride,
MIN2(block->width, surface->width - x*block->width),
MIN2(block->height, surface->height - y*block->height));
}
raw = screen->transfer_map(screen, transfer);
if (raw) {
const struct pipe_format_block *block = &transfer->block;
uint x, y;
for (y = 0; y < transfer->nblocksy; ++y) {
for (x = 0; x < transfer->nblocksx; ++x) {
st_sample_pixel_block(surface->format,
block,
(uint8_t *) raw + y * transfer->stride + x * block->size,
rgba + y * block->height * rgba_stride + x * block->width * 4,
rgba_stride,
MIN2(block->width, surface->width - x*block->width),
MIN2(block->height, surface->height - y*block->height));
}
}
screen->transfer_unmap(screen, transfer);
}
pipe_surface_unmap(surface);
screen->tex_transfer_destroy(transfer);
}