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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "skia/ext/draw_gainmap_image.h"
#include "base/check_op.h"
#include "base/logging.h"
#include "skia/ext/geometry.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkColorSpace.h"
#include "third_party/skia/include/core/SkShader.h"
#include "third_party/skia/include/core/SkSurface.h"
#include "third_party/skia/include/gpu/ganesh/GrRecordingContext.h"
#include "third_party/skia/include/gpu/ganesh/SkSurfaceGanesh.h"
#include "third_party/skia/include/gpu/graphite/Surface.h"
#include "third_party/skia/include/private/SkGainmapInfo.h"
#include "third_party/skia/include/private/SkGainmapShader.h"
namespace skia {
// Resample `gain_image` so that it has the same dimensions as `base_image`.
// Update `gain_rect` so that it has the same relationship to the new bounds
// of `gain_image` as it did to the old bounds. On failure, leave `gain_image`
// and `gain_rect` unchanged.
void ResampleGainmap(sk_sp<SkImage> base_image,
SkRect base_rect,
sk_sp<SkImage>& gain_image,
SkRect& gain_rect,
GrRecordingContext* context,
skgpu::graphite::Recorder* recorder) {
SkImageInfo surface_info = gain_image->imageInfo()
.makeDimensions(base_image->dimensions())
.makeColorSpace(nullptr);
sk_sp<SkSurface> surface;
#if defined(SK_GANESH)
if (context) {
surface =
SkSurfaces::RenderTarget(context, skgpu::Budgeted::kNo, surface_info,
/*sampleCount=*/0, kTopLeft_GrSurfaceOrigin,
/*surfaceProps=*/nullptr,
/*shouldCreateWithMips=*/false);
}
#endif
#if defined(SK_GRAPHITE)
if (recorder) {
surface =
SkSurfaces::RenderTarget(recorder, surface_info, skgpu::Mipmapped::kNo,
/*surfaceProps=*/nullptr);
}
#endif
if (!context && !recorder) {
surface = SkSurfaces::Raster(surface_info, surface_info.minRowBytes(),
/*surfaceProps=*/nullptr);
}
if (!surface) {
return;
}
SkRect dst_rect = SkRect::MakeSize(SkSize::Make(surface_info.dimensions()));
SkRect src_rect = ScaleSkRectProportional(gain_rect, base_rect, dst_rect);
surface->getCanvas()->drawImageRect(
gain_image, src_rect, dst_rect, SkSamplingOptions(SkFilterMode::kLinear),
nullptr, SkCanvas::kStrict_SrcRectConstraint);
auto resampled_gain_image = surface->makeImageSnapshot();
if (!resampled_gain_image) {
return;
}
gain_image = resampled_gain_image;
gain_rect = base_rect;
}
void DrawGainmapImageRect(SkCanvas* canvas,
sk_sp<SkImage> base_image,
sk_sp<SkImage> gain_image,
const SkGainmapInfo& gainmap_info,
float hdr_headroom,
const SkRect& source_rect,
const SkRect& dest_rect,
const SkSamplingOptions& sampling,
const SkPaint& paint) {
// Compute `dest_rect_clipped` to be intersected with the pre-image of the
// clip rect of `canvas`.
SkRect dest_rect_clipped = dest_rect;
const SkMatrix& dest_to_device = canvas->getTotalMatrix();
SkMatrix device_to_dest;
if (dest_to_device.invert(&device_to_dest)) {
SkRect dest_clip_rect;
device_to_dest.mapRect(&dest_clip_rect,
SkRect::Make(canvas->getDeviceClipBounds()));
dest_rect_clipped.intersect(dest_clip_rect);
}
// Compute the input rect for the base and gainmap images.
SkRect base_rect =
skia::ScaleSkRectProportional(source_rect, dest_rect, dest_rect_clipped);
SkRect gain_rect = skia::ScaleSkRectProportional(
SkRect::Make(gain_image->bounds()), SkRect::Make(base_image->bounds()),
base_rect);
auto* context = canvas->recordingContext();
auto* recorder = canvas->recorder();
// Compute a tiling that ensures that the base and gainmap images fit on the
// GPU.
const std::vector<SkRect> source_rects = {base_rect, gain_rect};
const std::vector<sk_sp<SkImage>> source_images = {base_image, gain_image};
int max_texture_size = 0;
if (context) {
max_texture_size = context->maxTextureSize();
} else if (recorder) {
// TODO(b/279234024): Retrieve correct max texture size for graphite.
max_texture_size = 8192;
}
skia::Tiling tiling(dest_rect_clipped, source_rects, source_images,
max_texture_size);
// Draw tile-by-tile.
for (int tx = 0; tx < tiling.GetTileCountX(); ++tx) {
for (int ty = 0; ty < tiling.GetTileCountY(); ++ty) {
// Retrieve the tile geometry.
SkRect tile_dest_rect;
std::vector<SkRect> tile_source_rects;
std::vector<std::optional<SkIRect>> tile_subset_rects;
tiling.GetTileRect(tx, ty, tile_dest_rect, tile_source_rects,
tile_subset_rects);
// Extract the images' subsets (if needed).
auto tile_source_images = source_images;
for (size_t i = 0; i < 2; ++i) {
if (!tile_subset_rects[i].has_value()) {
continue;
}
if (tile_subset_rects[i]->isEmpty()) {
tile_source_images[i] = nullptr;
} else {
tile_source_images[i] = tile_source_images[i]->makeSubset(
nullptr, tile_subset_rects[i].value());
}
}
// When nearnest-neighbor filtering is requested, first resample the
// gainmap image to have the same size as the base image using linear
// filtering. See b/341758170.
if (sampling.filter == SkFilterMode::kNearest &&
tile_source_rects[0] != tile_source_rects[1]) {
ResampleGainmap(tile_source_images[0], tile_source_rects[0],
tile_source_images[1], tile_source_rects[1], context,
recorder);
}
// SkGainmapShader will internally use SkImage::makeRawShader, which does
// not support cubic filtering. Disable cubic filtering here.
// https://crbug.com/374783345
std::vector<SkSamplingOptions> tile_sampling = {sampling, sampling};
for (size_t i = 0; i < 2; ++i) {
if (!tile_source_images[i] || !tile_sampling[i].useCubic) {
continue;
}
tile_sampling[i] = SkSamplingOptions(SkFilterMode::kLinear,
tile_source_images[i]->hasMipmaps()
? SkMipmapMode::kLinear
: SkMipmapMode::kNone);
}
// Draw the tile.
SkPaint tile_paint = paint;
auto shader = SkGainmapShader::Make(
tile_source_images[0], tile_source_rects[0], tile_sampling[0],
tile_source_images[1], tile_source_rects[1], tile_sampling[1],
gainmap_info, tile_dest_rect, hdr_headroom);
tile_paint.setShader(std::move(shader));
canvas->drawRect(tile_dest_rect, tile_paint);
}
}
}
void DrawGainmapImage(SkCanvas* canvas,
sk_sp<SkImage> base_image,
sk_sp<SkImage> gainmap_image,
const SkGainmapInfo& gainmap_info,
float hdr_headroom,
SkScalar left,
SkScalar top,
const SkSamplingOptions& sampling,
const SkPaint& paint) {
SkRect source_rect = SkRect::Make(base_image->bounds());
SkRect dest_rect =
SkRect::MakeXYWH(left, top, base_image->width(), base_image->height());
DrawGainmapImageRect(canvas, std::move(base_image), std::move(gainmap_image),
gainmap_info, hdr_headroom, source_rect, dest_rect,
sampling, paint);
}
} // namespace skia
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