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39
40#ifndef QSGOPENGLATLASTEXTURE_P_H
41#define QSGOPENGLATLASTEXTURE_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/QSize>
55
56#include <QtGui/qopengl.h>
57
58#include <QtQuick/QSGTexture>
59#include <QtQuick/private/qsgplaintexture_p.h>
60#include <QtQuick/private/qsgareaallocator_p.h>
61
62QT_BEGIN_NAMESPACE
63
64namespace QSGCompressedAtlasTexture {
65 class Atlas;
66}
67class QSGCompressedTextureFactory;
68
69namespace QSGOpenGLAtlasTexture
70{
71
72class Texture;
73class TextureBase;
74class Atlas;
75
76class Manager : public QObject
77{
78 Q_OBJECT
79
80public:
81 Manager(const QSize &surfacePixelSize);
82 ~Manager();
83
84 QSGTexture *create(const QImage &image, bool hasAlphaChannel);
85 QSGTexture *create(const QSGCompressedTextureFactory *factory);
86 void invalidate();
87
88private:
89 Atlas *m_atlas;
90 // set of atlases for different compressed formats
91 QHash<unsigned int, QSGCompressedAtlasTexture::Atlas*> m_atlases;
92
93 QSize m_atlas_size;
94 int m_atlas_size_limit;
95};
96
97class AtlasBase : public QObject
98{
99 Q_OBJECT
100public:
101 AtlasBase(const QSize &size);
102 ~AtlasBase();
103
104 void invalidate();
105
106 int textureId() const;
107 void bind(QSGTexture::Filtering filtering);
108
109 void remove(TextureBase *t);
110
111 QSize size() const { return m_size; }
112
113protected:
114 virtual void generateTexture() = 0;
115 virtual void uploadPendingTexture(int i) = 0;
116
117protected:
118 QSGAreaAllocator m_allocator;
119 unsigned int m_texture_id;
120 QSize m_size;
121 QList<TextureBase *> m_pending_uploads;
122
123private:
124 bool m_allocated;
125};
126
127class Atlas : public AtlasBase
128{
129public:
130 Atlas(const QSize &size);
131 ~Atlas();
132
133 void generateTexture() override;
134 void uploadPendingTexture(int i) override;
135
136 void upload(Texture *texture);
137 void uploadBgra(Texture *texture);
138
139 Texture *create(const QImage &image);
140
141 uint internalFormat() const { return m_internalFormat; }
142 uint externalFormat() const { return m_externalFormat; }
143
144private:
145 uint m_internalFormat;
146 uint m_externalFormat;
147
148 int m_atlas_transient_image_threshold;
149
150 uint m_use_bgra_fallback: 1;
151 uint m_debug_overlay : 1;
152};
153
154class TextureBase : public QSGTexture
155{
156 Q_OBJECT
157public:
158 TextureBase(AtlasBase *atlas, const QRect &textureRect);
159 ~TextureBase();
160
161 int textureId() const override { return m_atlas->textureId(); }
162 bool isAtlasTexture() const override { return true; }
163
164 QRect atlasSubRect() const { return m_allocated_rect; }
165
166 void bind() override;
167
168protected:
169 QRect m_allocated_rect;
170 AtlasBase *m_atlas;
171};
172
173class Texture : public TextureBase
174{
175 Q_OBJECT
176public:
177 Texture(Atlas *atlas, const QRect &textureRect, const QImage &image);
178 ~Texture();
179
180 QSize textureSize() const override { return atlasSubRectWithoutPadding().size(); }
181 void setHasAlphaChannel(bool alpha) { m_has_alpha = alpha; }
182 bool hasAlphaChannel() const override { return m_has_alpha; }
183 bool hasMipmaps() const override { return false; }
184
185 QRectF normalizedTextureSubRect() const override { return m_texture_coords_rect; }
186
187 QRect atlasSubRect() const { return m_allocated_rect; }
188 QRect atlasSubRectWithoutPadding() const { return m_allocated_rect.adjusted(xp1: 1, yp1: 1, xp2: -1, yp2: -1); }
189
190 QSGTexture *removedFromAtlas() const override;
191
192 void releaseImage() { m_image = QImage(); }
193 const QImage &image() const { return m_image; }
194
195private:
196 QRectF m_texture_coords_rect;
197 QImage m_image;
198 mutable QSGPlainTexture *m_nonatlas_texture;
199 bool m_has_alpha;
200};
201
202}
203
204QT_END_NAMESPACE
205
206#endif
207

source code of qtdeclarative/src/quick/scenegraph/util/qsgopenglatlastexture_p.h