1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// 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.
#ifndef SKIA_EXT_GEOMETRY_H_
#define SKIA_EXT_GEOMETRY_H_
#include <vector>
#include "skia/config/SkUserConfig.h"
#include "third_party/skia/include/core/SkImage.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/core/SkSize.h"
namespace skia {
// Returns a rect that has the same relationship to `output_bounds` as
// `input_rect` has to `input_bounds`. The only requirement for valid
// results is that `output_bounds` and `input_bounds` be non-empty.
SK_API SkRect ScaleSkRectProportional(const SkRect& output_bounds,
const SkRect& input_bounds,
const SkRect& input_rect);
// Helper structure for tiling a shader that has several input SkImages.
// In order for a shader executing in an accelerated context to sample
// from an SkImage, the SkImage must be upload-able to a texture. If
// an SkImage is too large to fit in a texture, then the draw call using
// the shader must be chopped multiple tiled draw calls.
class SK_API Tiling {
public:
// Create a tiling for sampling `source_rects` when writing to
// `dest_rect`. This will split `dest_rect` into tiles such that the
// corresponding rect of each of `source_rects` will not have width
// or height greater than `source_max_size`.
Tiling(const SkRect& dest_rect,
std::vector<SkRect> source_rects,
std::vector<sk_sp<SkImage>> source_images,
int32_t source_max_size);
~Tiling();
// Return the number of horizontal and vertical tiles in the tiling.
int GetTileCountX() const { return tile_count_.width(); }
int GetTileCountY() const { return tile_count_.height(); }
// For the tile at the specified coordiantes, populate:
// - `tile_dest_rect` with the destination rect for the tile
// - `tile_source_rects` with the source rect for the tile
// - `tile_subset_rects` with the subset of the source image to use. If no
// subset of the image should be taken then it will be empty.
void GetTileRect(
int x,
int y,
SkRect& tile_dest_rect,
std::vector<SkRect>& tile_source_rects,
std::vector<std::optional<SkIRect>>& tile_source_subset_rects);
private:
// The destination rectangle for the drawRect call.
SkRect dest_rect_;
// The length of both `source_rects_` and `source_images_`.
size_t source_count_ = 0;
// The input rects that `source_images_` are sampled from.
std::vector<SkRect> source_rects_;
// The input images being sampled.
std::vector<sk_sp<SkImage>> source_images_;
// The computed size of the tiles and number of tiles.
SkSize tile_size_;
SkISize tile_count_;
};
} // namespace skia
#endif // SKIA_EXT_GEOMETRY_H_
|
