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gl: Check for image validity in readback

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Returning a null QImage is preferable over passing a null bits()
to glReadPixels. (matters when QImage's malloc() gives null, thus
'd' is null -> isNull() == true)

Fixes: QTBUG-113127
Change-Id: Ieca4d91eefdea47da5251dabe77cc31b48eb0e28
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
(cherry picked from commit 11209cfde68e9b8b8722859c690e57c7d6e8a338)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Laszlo Agocs 2023-04-24 10:47:44 +02:00 committed by Qt Cherry-pick Bot
parent 44ab03068c
commit 67f78a1e7f
1 changed files with 12 additions and 6 deletions
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18
src/opengl/qopenglframebufferobject.cpp
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@ -1370,7 +1370,8 @@ static inline QImage qt_gl_read_framebuffer_rgba8(const QSize &size, bool includ
bool isOpenGL12orBetter = !context->isOpenGLES() && (context->format().majorVersion() >= 2 || context->format().minorVersion() >= 2);
if (isOpenGL12orBetter) {
QImage img(size, include_alpha ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32);
funcs->glReadPixels(0, 0, w, h, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, img.bits());
if (!img.isNull())
funcs->glReadPixels(0, 0, w, h, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, img.bits());
return img;
}
@ -1380,7 +1381,8 @@ static inline QImage qt_gl_read_framebuffer_rgba8(const QSize &size, bool includ
// BGRA capable impl would return BGRA from there)
QImage rgbaImage(size, include_alpha ? QImage::Format_RGBA8888_Premultiplied : QImage::Format_RGBX8888);
funcs->glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, rgbaImage.bits());
if (!rgbaImage.isNull())
funcs->glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, rgbaImage.bits());
return rgbaImage;
}
@ -1388,7 +1390,8 @@ static inline QImage qt_gl_read_framebuffer_rgb10a2(const QSize &size, bool incl
{
// We assume OpenGL 1.2+ or ES 3.0+ here.
QImage img(size, include_alpha ? QImage::Format_A2BGR30_Premultiplied : QImage::Format_BGR30);
context->functions()->glReadPixels(0, 0, size.width(), size.height(), GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, img.bits());
if (!img.isNull())
context->functions()->glReadPixels(0, 0, size.width(), size.height(), GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, img.bits());
return img;
}
@ -1396,7 +1399,8 @@ static inline QImage qt_gl_read_framebuffer_rgba16(const QSize &size, bool inclu
{
// We assume OpenGL 1.2+ or ES 3.0+ here.
QImage img(size, include_alpha ? QImage::Format_RGBA64_Premultiplied : QImage::Format_RGBX64);
context->functions()->glReadPixels(0, 0, size.width(), size.height(), GL_RGBA, GL_UNSIGNED_SHORT, img.bits());
if (!img.isNull())
context->functions()->glReadPixels(0, 0, size.width(), size.height(), GL_RGBA, GL_UNSIGNED_SHORT, img.bits());
return img;
}
@ -1404,14 +1408,16 @@ static inline QImage qt_gl_read_framebuffer_rgba16f(const QSize &size, bool incl
{
// We assume OpenGL (ES) 3.0+ here.
QImage img(size, include_alpha ? QImage::Format_RGBA16FPx4_Premultiplied : QImage::Format_RGBX16FPx4);
context->functions()->glReadPixels(0, 0, size.width(), size.height(), GL_RGBA, GL_HALF_FLOAT, img.bits());
if (!img.isNull())
context->functions()->glReadPixels(0, 0, size.width(), size.height(), GL_RGBA, GL_HALF_FLOAT, img.bits());
return img;
}
static inline QImage qt_gl_read_framebuffer_rgba32f(const QSize &size, bool include_alpha, QOpenGLContext *context)
{
QImage img(size, include_alpha ? QImage::Format_RGBA32FPx4_Premultiplied : QImage::Format_RGBX32FPx4);
context->functions()->glReadPixels(0, 0, size.width(), size.height(), GL_RGBA, GL_FLOAT, img.bits());
if (!img.isNull())
context->functions()->glReadPixels(0, 0, size.width(), size.height(), GL_RGBA, GL_FLOAT, img.bits());
return img;
}