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Side by Side Diff: content/browser/compositor/gl_helper_readback_support.h

Issue 1905863002: Revert of Introduce components/display_compositor (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 8 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef CONTENT_BROWSER_COMPOSITOR_GL_HELPER_READBACK_SUPPORT_H_
6 #define CONTENT_BROWSER_COMPOSITOR_GL_HELPER_READBACK_SUPPORT_H_
7
8 #include <stddef.h>
9
10 #include <vector>
11
12 #include "content/browser/compositor/gl_helper.h"
13
14 namespace content {
15
16 class CONTENT_EXPORT GLHelperReadbackSupport {
17 public:
18 enum FormatSupport { SUPPORTED, SWIZZLE, NOT_SUPPORTED };
19
20 GLHelperReadbackSupport(gpu::gles2::GLES2Interface* gl);
21
22 ~GLHelperReadbackSupport();
23
24 // For a given color type retrieve whether readback is supported and if so
25 // how it should be performed. The |format|, |type| and |bytes_per_pixel| are
26 // the values that should be used with glReadPixels to facilitate the
27 // readback. If |can_swizzle| is true then this method will return SWIZZLE if
28 // the data needs to be swizzled before using the returned |format| otherwise
29 // the method will return SUPPORTED to indicate that readback is permitted of
30 // this color othewise NOT_SUPPORTED will be returned. This method always
31 // overwrites the out values irrespective of the return value.
32 FormatSupport GetReadbackConfig(SkColorType color_type,
33 bool can_swizzle,
34 GLenum* format,
35 GLenum* type,
36 size_t* bytes_per_pixel);
37 // Provides the additional readback format/type pairing for a render target
38 // of a given format/type pairing
39 void GetAdditionalFormat(GLenum format,
40 GLenum type,
41 GLenum* format_out,
42 GLenum* type_out);
43
44 private:
45 struct FormatCacheEntry {
46 GLenum format;
47 GLenum type;
48 GLenum read_format;
49 GLenum read_type;
50 };
51
52 // This populates the format_support_table with the list of supported
53 // formats.
54 void InitializeReadbackSupport();
55
56 // This api is called once per format and it is done in the
57 // InitializeReadbackSupport. We should not use this any where
58 // except the InitializeReadbackSupport.Calling this at other places
59 // can distrub the state of normal gl operations.
60 void CheckForReadbackSupport(SkColorType texture_format);
61
62 // Helper functions for checking the supported texture formats.
63 // Avoid using this API in between texture operations, as this does some
64 // teture opertions (bind, attach) internally.
65 bool SupportsFormat(GLenum format, GLenum type);
66
67 FormatSupport format_support_table_[kLastEnum_SkColorType + 1];
68
69 gpu::gles2::GLES2Interface* gl_;
70 std::vector<struct FormatCacheEntry> format_cache_;
71 };
72
73 } // namespace content
74
75 #endif // CONTENT_BROWSER_COMPOSITOR_GL_HELPER_READBACK_SUPPORT_H_
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