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demos/sdlimage: set palette as source lut #122

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demos/sdlimage: set palette as source lut #122

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36 changes: 26 additions & 10 deletions demos/sdlimage.c
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ static struct pl_plane img_plane;
static struct pl_plane osd_plane;
static pl_renderer renderer;
static struct pl_custom_lut *lut;
static struct pl_custom_lut *palette_lut;

struct file
{
Expand Down Expand Up @@ -105,14 +106,6 @@ static bool upload_plane(const SDL_Surface *img, pl_tex *tex,

SDL_Surface *fixed = NULL;
const SDL_PixelFormat *fmt = img->format;
if (SDL_ISPIXELFORMAT_INDEXED(fmt->format)) {
// libplacebo doesn't handle indexed formats yet
fixed = SDL_CreateRGBSurfaceWithFormat(0, img->w, img->h, 32,
SDL_PIXELFORMAT_ABGR8888);
SDL_BlitSurface((SDL_Surface *) img, NULL, fixed, NULL);
img = fixed;
fmt = img->format;
}

struct pl_plane_data data = {
.type = PL_FMT_UNORM,
Expand All @@ -123,8 +116,24 @@ static bool upload_plane(const SDL_Surface *img, pl_tex *tex,
.pixels = img->pixels,
};

uint64_t masks[4] = { fmt->Rmask, fmt->Gmask, fmt->Bmask, fmt->Amask };
pl_plane_data_from_mask(&data, masks);
if (fmt->palette) {
palette_lut = calloc(1, sizeof(struct pl_custom_lut));
palette_lut->signature = 1;
palette_lut->size[0] = 1 << fmt->BitsPerPixel;
palette_lut->size[1] = 1;
palette_lut->size[2] = 1;
data.component_size[0] = fmt->BitsPerPixel;
float *palette = calloc(1 << fmt->BitsPerPixel, sizeof(float[3]));
for (int i = 0; i < fmt->palette->ncolors; i++) {
palette[3 * i + 0] = fmt->palette->colors[i].r / 255.;
palette[3 * i + 1] = fmt->palette->colors[i].g / 255.;
palette[3 * i + 2] = fmt->palette->colors[i].b / 255.;
}
palette_lut->data = palette;
} else {
uint64_t masks[4] = { fmt->Rmask, fmt->Gmask, fmt->Bmask, fmt->Amask };
pl_plane_data_from_mask(&data, masks);
}

bool ok = pl_upload_plane(win->gpu, plane, tex, &data);
SDL_FreeSurface(fixed);
Expand All @@ -140,6 +149,7 @@ static bool render_frame(const struct pl_swapchain_frame *frame)
.repr = pl_color_repr_unknown,
.color = pl_color_space_unknown,
.crop = {0, 0, img->params.w, img->params.h},
.lut = palette_lut,
};

// This seems to be the case for SDL2_image
Expand Down Expand Up @@ -177,6 +187,12 @@ static bool render_frame(const struct pl_swapchain_frame *frame)

// Use the heaviest preset purely for demonstration/testing purposes
struct pl_render_params params = pl_render_high_quality_params;

if (palette_lut) {
// Debanding would interpolate palette indices
params.deband_params = NULL;
}

params.lut = lut;

return pl_render_image(renderer, &image, &target, &params);
Expand Down