qplatformgraphicsbufferhelper.cpp

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1/****************************************************************************-
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3** Copyright (C) 2016 The Qt Company Ltd.-
4** Contact: https://www.qt.io/licensing/-
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6** This file is part of the QtPlatformSupport module of the Qt Toolkit.-
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38****************************************************************************/-
39-
40#include <QtGui/qpa/qplatformgraphicsbuffer.h>-
41-
42#include "qplatformgraphicsbufferhelper.h"-
43#include <QtCore/QDebug>-
44#include <QtGui/qopengl.h>-
45#include <QtGui/QImage>-
46#include <QtGui/QOpenGLContext>-
47#include <QtGui/QOpenGLFunctions>-
48-
49#ifndef GL_RGB10_A2-
50#define GL_RGB10_A2 0x8059-
51#endif-
52-
53#ifndef GL_UNSIGNED_INT_2_10_10_10_REV-
54#define GL_UNSIGNED_INT_2_10_10_10_REV 0x8368-
55#endif-
56-
57QT_BEGIN_NAMESPACE-
58-
59/*!-
60 Convenience function to both lock and bind the buffer to a texture. This-
61 function will first try and lock with texture read and texture write-
62 access. If this succeeds it will use the bindToTexture function to bind the-
63 content to the currently bound texture. If this fail it will try and lock-
64 with SWReadAccess and then use the bindSWToTexture convenience function.-
65-
66 \a swizzle is suppose to be used by the caller to figure out if the Red and-
67 Blue color channels need to be swizzled when rendering.-
68-
69 \a rect is the subrect which is desired to be bounded to the texture. This-
70 argument has a no less than semantic, meaning more (if not all) of the buffer-
71 can be bounded to the texture. An empty QRect is interpreted as entire buffer-
72 should be bound.-
73-
74 The user should use the AccessTypes returned by isLocked to figure out what-
75 lock has been obtained.-
76-
77 returns true if the buffer has successfully been bound to the currently-
78 bound texture, otherwise returns false.-
79*/-
80bool QPlatformGraphicsBufferHelper::lockAndBindToTexture(QPlatformGraphicsBuffer *graphicsBuffer,-
81 bool *swizzle, bool *premultiplied,-
82 const QRect &rect)-
83{-
84 if (graphicsBuffer->lock(QPlatformGraphicsBuffer::TextureAccess)) {
graphicsBuffer...TextureAccess)Description
TRUEnever evaluated
FALSEnever evaluated
0
85 if (!graphicsBuffer->bindToTexture(rect)) {
!graphicsBuffe...oTexture(rect)Description
TRUEnever evaluated
FALSEnever evaluated
0
86 qWarning("Failed to bind %sgraphicsbuffer to texture", "");-
87 return false;
never executed: return false;
0
88 }-
89 if (swizzle)
swizzleDescription
TRUEnever evaluated
FALSEnever evaluated
0
90 *swizzle = false;
never executed: *swizzle = false;
0
91 if (premultiplied)
premultipliedDescription
TRUEnever evaluated
FALSEnever evaluated
0
92 *premultiplied = false;
never executed: *premultiplied = false;
0
93 } else if (graphicsBuffer->lock(QPlatformGraphicsBuffer::SWReadAccess)) {
never executed: end of block
graphicsBuffer...:SWReadAccess)Description
TRUEnever evaluated
FALSEnever evaluated
0
94 if (!bindSWToTexture(graphicsBuffer, swizzle, premultiplied, rect)) {
!bindSWToTextu...tiplied, rect)Description
TRUEnever evaluated
FALSEnever evaluated
0
95 qWarning("Failed to bind %sgraphicsbuffer to texture", "SW ");-
96 return false;
never executed: return false;
0
97 }-
98 } else {
never executed: end of block
0
99 qWarning("Failed to lock");-
100 return false;
never executed: return false;
0
101 }-
102 return true;
never executed: return true;
0
103}-
104-
105/*!-
106 Convenience function that uploads the current raster content to the currently bound texture.-
107-
108 \a swizzleRandB is suppose to be used by the caller to figure out if the Red and-
109 Blue color channels need to be swizzled when rendering. This is an-
110 optimization. Qt often renders to software buffers interpreting pixels as-
111 unsigned ints. When these buffers are uploaded to textures and each color-
112 channel per pixel is interpreted as a byte (read sequentially), then the-
113 Red and Blue channels are swapped. Conveniently the Alpha buffer will be-
114 correct since Qt historically has had the alpha channel as the first-
115 channel, while OpenGL typically expects the alpha channel to be the last-
116 channel.-
117-
118 \a subRect is the subrect which is desired to be bounded to the texture. This-
119 argument has a no less than semantic, meaning more (if not all) of the buffer-
120 can be bounded to the texture. An empty QRect is interpreted as entire buffer-
121 should be bound.-
122-
123 This function fails for buffers not capable of locking to SWAccess.-
124-
125 Returns true on success, otherwise false.-
126*/-
127bool QPlatformGraphicsBufferHelper::bindSWToTexture(const QPlatformGraphicsBuffer *graphicsBuffer,-
128 bool *swizzleRandB, bool *premultipliedB,-
129 const QRect &subRect)-
130{-
131#ifndef QT_NO_OPENGL-
132 QOpenGLContext *ctx = QOpenGLContext::currentContext();-
133 if (!ctx)
!ctxDescription
TRUEnever evaluated
FALSEnever evaluated
0
134 return false;
never executed: return false;
0
135-
136 if (!(graphicsBuffer->isLocked() & QPlatformGraphicsBuffer::SWReadAccess))
!(graphicsBuff...:SWReadAccess)Description
TRUEnever evaluated
FALSEnever evaluated
0
137 return false;
never executed: return false;
0
138-
139 QSize size = graphicsBuffer->size();-
140-
141 Q_ASSERT(subRect.isEmpty() || QRect(QPoint(0,0), size).contains(subRect));-
142-
143 GLenum internalFormat = GL_RGBA;-
144 GLuint pixelType = GL_UNSIGNED_BYTE;-
145-
146 bool needsConversion = false;-
147 bool swizzle = false;-
148 bool premultiplied = false;-
149 QImage::Format imageformat = QImage::toImageFormat(graphicsBuffer->format());-
150 QImage image(graphicsBuffer->data(), size.width(), size.height(), graphicsBuffer->bytesPerLine(), imageformat);-
151 if (graphicsBuffer->bytesPerLine() != (size.width() * 4)) {
graphicsBuffer...e.width() * 4)Description
TRUEnever evaluated
FALSEnever evaluated
0
152 needsConversion = true;-
153 } else {
never executed: end of block
0
154 switch (imageformat) {-
155 case QImage::Format_ARGB32_Premultiplied:
never executed: case QImage::Format_ARGB32_Premultiplied:
0
156 premultiplied = true;-
157 // no break-
158 case QImage::Format_RGB32:
code before this statement never executed: case QImage::Format_RGB32:
never executed: case QImage::Format_RGB32:
0
159 case QImage::Format_ARGB32:
never executed: case QImage::Format_ARGB32:
0
160 swizzle = true;-
161 break;
never executed: break;
0
162 case QImage::Format_RGBA8888_Premultiplied:
never executed: case QImage::Format_RGBA8888_Premultiplied:
0
163 premultiplied = true;-
164 // no break-
165 case QImage::Format_RGBX8888:
code before this statement never executed: case QImage::Format_RGBX8888:
never executed: case QImage::Format_RGBX8888:
0
166 case QImage::Format_RGBA8888:
never executed: case QImage::Format_RGBA8888:
0
167 break;
never executed: break;
0
168 case QImage::Format_BGR30:
never executed: case QImage::Format_BGR30:
0
169 case QImage::Format_A2BGR30_Premultiplied:
never executed: case QImage::Format_A2BGR30_Premultiplied:
0
170 if (!ctx->isOpenGLES() || ctx->format().majorVersion() >= 3) {
!ctx->isOpenGLES()Description
TRUEnever evaluated
FALSEnever evaluated
ctx->format()....Version() >= 3Description
TRUEnever evaluated
FALSEnever evaluated
0
171 pixelType = GL_UNSIGNED_INT_2_10_10_10_REV;-
172 internalFormat = GL_RGB10_A2;-
173 premultiplied = true;-
174 } else {
never executed: end of block
0
175 needsConversion = true;-
176 }
never executed: end of block
0
177 break;
never executed: break;
0
178 case QImage::Format_RGB30:
never executed: case QImage::Format_RGB30:
0
179 case QImage::Format_A2RGB30_Premultiplied:
never executed: case QImage::Format_A2RGB30_Premultiplied:
0
180 if (!ctx->isOpenGLES() || ctx->format().majorVersion() >= 3) {
!ctx->isOpenGLES()Description
TRUEnever evaluated
FALSEnever evaluated
ctx->format()....Version() >= 3Description
TRUEnever evaluated
FALSEnever evaluated
0
181 pixelType = GL_UNSIGNED_INT_2_10_10_10_REV;-
182 internalFormat = GL_RGB10_A2;-
183 premultiplied = true;-
184 swizzle = true;-
185 } else {
never executed: end of block
0
186 needsConversion = true;-
187 }
never executed: end of block
0
188 break;
never executed: break;
0
189 default:
never executed: default:
0
190 needsConversion = true;-
191 break;
never executed: break;
0
192 }-
193 }-
194 if (needsConversion)
needsConversionDescription
TRUEnever evaluated
FALSEnever evaluated
0
195 image = image.convertToFormat(QImage::Format_RGBA8888);
never executed: image = image.convertToFormat(QImage::Format_RGBA8888);
0
196-
197 QOpenGLFunctions *funcs = ctx->functions();-
198-
199 QRect rect = subRect;-
200 if (rect.isNull() || rect == QRect(QPoint(0,0),size)) {
rect.isNull()Description
TRUEnever evaluated
FALSEnever evaluated
rect == QRect(...int(0,0),size)Description
TRUEnever evaluated
FALSEnever evaluated
0
201 funcs->glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, size.width(), size.height(), 0, GL_RGBA, pixelType, image.constBits());-
202 } else {
never executed: end of block
0
203#ifndef QT_OPENGL_ES_2-
204 if (!ctx->isOpenGLES()) {
!ctx->isOpenGLES()Description
TRUEnever evaluated
FALSEnever evaluated
0
205 funcs->glPixelStorei(GL_UNPACK_ROW_LENGTH, image.width());-
206 funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,-
207 image.constScanLine(rect.y()) + rect.x() * 4);-
208 funcs->glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);-
209 } else
never executed: end of block
0
210#endif-
211 {-
212 // if the rect is wide enough it's cheaper to just-
213 // extend it instead of doing an image copy-
214 if (rect.width() >= size.width() / 2) {
rect.width() >...ze.width() / 2Description
TRUEnever evaluated
FALSEnever evaluated
0
215 rect.setX(0);-
216 rect.setWidth(size.width());-
217 }
never executed: end of block
0
218-
219 // if the sub-rect is full-width we can pass the image data directly to-
220 // OpenGL instead of copying, since there's no gap between scanlines-
221-
222 if (rect.width() == size.width()) {
rect.width() == size.width()Description
TRUEnever evaluated
FALSEnever evaluated
0
223 funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,-
224 image.constScanLine(rect.y()));-
225 } else {
never executed: end of block
0
226 funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,-
227 image.copy(rect).constBits());-
228 }
never executed: end of block
0
229 }-
230 }-
231 if (swizzleRandB)
swizzleRandBDescription
TRUEnever evaluated
FALSEnever evaluated
0
232 *swizzleRandB = swizzle;
never executed: *swizzleRandB = swizzle;
0
233 if (premultipliedB)
premultipliedBDescription
TRUEnever evaluated
FALSEnever evaluated
0
234 *premultipliedB = premultiplied;
never executed: *premultipliedB = premultiplied;
0
235-
236 return true;
never executed: return true;
0
237-
238#else-
239 Q_UNUSED(graphicsBuffer)-
240 Q_UNUSED(swizzleRandB)-
241 Q_UNUSED(premultipliedB)-
242 Q_UNUSED(subRect)-
243 return false;-
244#endif // QT_NO_OPENGL-
245}-
246-
247QT_END_NAMESPACE-
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