qplatformgraphicsbufferhelper.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2015 The Qt Company Ltd.-
4** Contact: http://www.qt.io/licensing/-
5**-
6** This file is part of the QtPlatformSupport module of the Qt Toolkit.-
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29**-
30** $QT_END_LICENSE$-
31**-
32****************************************************************************/-
33-
34#include <QtGui/qpa/qplatformgraphicsbuffer.h>-
35-
36#include "qplatformgraphicsbufferhelper.h"-
37#include <QtCore/QDebug>-
38#include <QtGui/qopengl.h>-
39#include <QtGui/QImage>-
40#include <QtGui/QOpenGLContext>-
41#include <QtGui/QOpenGLFunctions>-
42-
43#ifndef GL_RGB10_A2-
44#define GL_RGB10_A2 0x8059-
45#endif-
46-
47#ifndef GL_UNSIGNED_INT_2_10_10_10_REV-
48#define GL_UNSIGNED_INT_2_10_10_10_REV 0x8368-
49#endif-
50-
51QT_BEGIN_NAMESPACE-
52-
53/*!-
54 Convenience function to both lock and bind the buffer to a texture. This-
55 function will first try and lock with texture read and texture write-
56 access. If this succeeds it will use the bindToTexture function to bind the-
57 content to the currently bound texture. If this fail it will try and lock-
58 with SWReadAccess and then use the bindSWToTexture convenience function.-
59-
60 \a swizzle is suppose to be used by the caller to figure out if the Red and-
61 Blue color channels need to be swizzled when rendering.-
62-
63 \a rect is the subrect which is desired to be bounded to the texture. This-
64 argument has a no less than semantic, meaning more (if not all) of the buffer-
65 can be bounded to the texture. An empty QRect is interpreted as entire buffer-
66 should be bound.-
67-
68 The user should use the AccessTypes returned by isLocked to figure out what-
69 lock has been obtained.-
70-
71 returns true if the buffer has successfully been bound to the currently-
72 bound texture, otherwise returns false.-
73*/-
74bool QPlatformGraphicsBufferHelper::lockAndBindToTexture(QPlatformGraphicsBuffer *graphicsBuffer,-
75 bool *swizzle, bool *premultiplied,-
76 const QRect &rect)-
77{-
78 if (graphicsBuffer->lock(QPlatformGraphicsBuffer::TextureAccess)) {
graphicsBuffer...TextureAccess)Description
TRUEnever evaluated
FALSEnever evaluated
0
79 if (!graphicsBuffer->bindToTexture(rect)) {
!graphicsBuffe...oTexture(rect)Description
TRUEnever evaluated
FALSEnever evaluated
0
80 qWarning("Failed to bind %sgraphicsbuffer to texture", "");-
81 return false;
never executed: return false;
0
82 }-
83 if (swizzle)
swizzleDescription
TRUEnever evaluated
FALSEnever evaluated
0
84 *swizzle = false;
never executed: *swizzle = false;
0
85 if (premultiplied)
premultipliedDescription
TRUEnever evaluated
FALSEnever evaluated
0
86 *premultiplied = false;
never executed: *premultiplied = false;
0
87 } else if (graphicsBuffer->lock(QPlatformGraphicsBuffer::SWReadAccess)) {
never executed: end of block
graphicsBuffer...:SWReadAccess)Description
TRUEnever evaluated
FALSEnever evaluated
0
88 if (!bindSWToTexture(graphicsBuffer, swizzle, premultiplied, rect)) {
!bindSWToTextu...tiplied, rect)Description
TRUEnever evaluated
FALSEnever evaluated
0
89 qWarning("Failed to bind %sgraphicsbuffer to texture", "SW ");-
90 return false;
never executed: return false;
0
91 }-
92 } else {
never executed: end of block
0
93 qWarning("Failed to lock");-
94 return false;
never executed: return false;
0
95 }-
96 return true;
never executed: return true;
0
97}-
98-
99/*!-
100 Convenience function that uploads the current raster content to the currently bound texture.-
101-
102 \a swizzleRandB is suppose to be used by the caller to figure out if the Red and-
103 Blue color channels need to be swizzled when rendering. This is an-
104 optimization. Qt often renders to software buffers interpreting pixels as-
105 unsigned ints. When these buffers are uploaded to textures and each color-
106 channel per pixel is interpreted as a byte (read sequentially), then the-
107 Red and Blue channels are swapped. Conveniently the Alpha buffer will be-
108 correct since Qt historically has had the alpha channel as the first-
109 channel, while OpenGL typically expects the alpha channel to be the last-
110 channel.-
111-
112 \a subRect is the subrect which is desired to be bounded to the texture. This-
113 argument has a no less than semantic, meaning more (if not all) of the buffer-
114 can be bounded to the texture. An empty QRect is interpreted as entire buffer-
115 should be bound.-
116-
117 This function fails for buffers not capable of locking to SWAccess.-
118-
119 Returns true on success, otherwise false.-
120*/-
121bool QPlatformGraphicsBufferHelper::bindSWToTexture(const QPlatformGraphicsBuffer *graphicsBuffer,-
122 bool *swizzleRandB, bool *premultipliedB,-
123 const QRect &subRect)-
124{-
125#ifndef QT_NO_OPENGL-
126 QOpenGLContext *ctx = QOpenGLContext::currentContext();-
127 if (!ctx)
!ctxDescription
TRUEnever evaluated
FALSEnever evaluated
0
128 return false;
never executed: return false;
0
129-
130 if (!(graphicsBuffer->isLocked() & QPlatformGraphicsBuffer::SWReadAccess))
!(graphicsBuff...:SWReadAccess)Description
TRUEnever evaluated
FALSEnever evaluated
0
131 return false;
never executed: return false;
0
132-
133 QSize size = graphicsBuffer->size();-
134-
135 Q_ASSERT(subRect.isEmpty() || QRect(QPoint(0,0), size).contains(subRect));-
136-
137 GLenum internalFormat = GL_RGBA;-
138 GLuint pixelType = GL_UNSIGNED_BYTE;-
139-
140 bool needsConversion = false;-
141 bool swizzle = false;-
142 bool premultiplied = false;-
143 QImage::Format imageformat = QImage::toImageFormat(graphicsBuffer->format());-
144 QImage image(graphicsBuffer->data(), size.width(), size.height(), graphicsBuffer->bytesPerLine(), imageformat);-
145 if (graphicsBuffer->bytesPerLine() != (size.width() * 4)) {
graphicsBuffer...e.width() * 4)Description
TRUEnever evaluated
FALSEnever evaluated
0
146 needsConversion = true;-
147 } else {
never executed: end of block
0
148 switch (imageformat) {-
149 case QImage::Format_ARGB32_Premultiplied:
never executed: case QImage::Format_ARGB32_Premultiplied:
0
150 premultiplied = true;-
151 // no break-
152 case QImage::Format_RGB32:
code before this statement never executed: case QImage::Format_RGB32:
never executed: case QImage::Format_RGB32:
0
153 case QImage::Format_ARGB32:
never executed: case QImage::Format_ARGB32:
0
154 swizzle = true;-
155 break;
never executed: break;
0
156 case QImage::Format_RGBA8888_Premultiplied:
never executed: case QImage::Format_RGBA8888_Premultiplied:
0
157 premultiplied = true;-
158 // no break-
159 case QImage::Format_RGBX8888:
code before this statement never executed: case QImage::Format_RGBX8888:
never executed: case QImage::Format_RGBX8888:
0
160 case QImage::Format_RGBA8888:
never executed: case QImage::Format_RGBA8888:
0
161 break;
never executed: break;
0
162 case QImage::Format_BGR30:
never executed: case QImage::Format_BGR30:
0
163 case QImage::Format_A2BGR30_Premultiplied:
never executed: case QImage::Format_A2BGR30_Premultiplied:
0
164 if (!ctx->isOpenGLES() || ctx->format().majorVersion() >= 3) {
!ctx->isOpenGLES()Description
TRUEnever evaluated
FALSEnever evaluated
ctx->format()....Version() >= 3Description
TRUEnever evaluated
FALSEnever evaluated
0
165 pixelType = GL_UNSIGNED_INT_2_10_10_10_REV;-
166 internalFormat = GL_RGB10_A2;-
167 premultiplied = true;-
168 } else {
never executed: end of block
0
169 needsConversion = true;-
170 }
never executed: end of block
0
171 break;
never executed: break;
0
172 case QImage::Format_RGB30:
never executed: case QImage::Format_RGB30:
0
173 case QImage::Format_A2RGB30_Premultiplied:
never executed: case QImage::Format_A2RGB30_Premultiplied:
0
174 if (!ctx->isOpenGLES() || ctx->format().majorVersion() >= 3) {
!ctx->isOpenGLES()Description
TRUEnever evaluated
FALSEnever evaluated
ctx->format()....Version() >= 3Description
TRUEnever evaluated
FALSEnever evaluated
0
175 pixelType = GL_UNSIGNED_INT_2_10_10_10_REV;-
176 internalFormat = GL_RGB10_A2;-
177 premultiplied = true;-
178 swizzle = true;-
179 } else {
never executed: end of block
0
180 needsConversion = true;-
181 }
never executed: end of block
0
182 break;
never executed: break;
0
183 default:
never executed: default:
0
184 needsConversion = true;-
185 break;
never executed: break;
0
186 }-
187 }-
188 if (needsConversion)
needsConversionDescription
TRUEnever evaluated
FALSEnever evaluated
0
189 image = image.convertToFormat(QImage::Format_RGBA8888);
never executed: image = image.convertToFormat(QImage::Format_RGBA8888);
0
190-
191 QOpenGLFunctions *funcs = ctx->functions();-
192-
193 QRect rect = subRect;-
194 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
195 funcs->glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, size.width(), size.height(), 0, GL_RGBA, pixelType, image.constBits());-
196 } else {
never executed: end of block
0
197#ifndef QT_OPENGL_ES_2-
198 if (!ctx->isOpenGLES()) {
!ctx->isOpenGLES()Description
TRUEnever evaluated
FALSEnever evaluated
0
199 funcs->glPixelStorei(GL_UNPACK_ROW_LENGTH, image.width());-
200 funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,-
201 image.constScanLine(rect.y()) + rect.x() * 4);-
202 funcs->glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);-
203 } else
never executed: end of block
0
204#endif-
205 {-
206 // if the rect is wide enough it's cheaper to just-
207 // extend it instead of doing an image copy-
208 if (rect.width() >= size.width() / 2) {
rect.width() >...ze.width() / 2Description
TRUEnever evaluated
FALSEnever evaluated
0
209 rect.setX(0);-
210 rect.setWidth(size.width());-
211 }
never executed: end of block
0
212-
213 // if the sub-rect is full-width we can pass the image data directly to-
214 // OpenGL instead of copying, since there's no gap between scanlines-
215-
216 if (rect.width() == size.width()) {
rect.width() == size.width()Description
TRUEnever evaluated
FALSEnever evaluated
0
217 funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,-
218 image.constScanLine(rect.y()));-
219 } else {
never executed: end of block
0
220 funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, pixelType,-
221 image.copy(rect).constBits());-
222 }
never executed: end of block
0
223 }-
224 }-
225 if (swizzleRandB)
swizzleRandBDescription
TRUEnever evaluated
FALSEnever evaluated
0
226 *swizzleRandB = swizzle;
never executed: *swizzleRandB = swizzle;
0
227 if (premultipliedB)
premultipliedBDescription
TRUEnever evaluated
FALSEnever evaluated
0
228 *premultipliedB = premultiplied;
never executed: *premultipliedB = premultiplied;
0
229-
230 return true;
never executed: return true;
0
231-
232#else-
233 Q_UNUSED(graphicsBuffer)-
234 Q_UNUSED(swizzleRandB)-
235 Q_UNUSED(premultipliedB)-
236 Q_UNUSED(subRect)-
237 return false;-
238#endif // QT_NO_OPENGL-
239}-
240-
241QT_END_NAMESPACE-
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