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Issue #123: Alternative software rendering backend

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This commit is contained in:
Jakub Melka
2024-02-04 18:05:38 +01:00
parent 87cedf01dc
commit d314683d38
48 changed files with 872 additions and 761 deletions
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70
Pdf4QtLibCore/sources/pdfrenderer.h
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@ -28,13 +28,9 @@
#include <QMutex>
#include <QSemaphore>
#include <QImageWriter>
#include <QSurfaceFormat>
#include <QImage>
class QPainter;
class QOpenGLContext;
class QOffscreenSurface;
class QOpenGLFramebufferObject;
namespace pdf
{
@ -46,30 +42,6 @@ class PDFPrecompiledPage;
class PDFAnnotationManager;
class PDFOptionalContentActivity;
class PDF4QTLIBCORESHARED_EXPORT PDFRendererInfo
{
public:
PDFRendererInfo() = delete;
struct Info
{
QString vendor;
QString renderer;
QString version;
int majorOpenGLVersion = 0;
int minorOpenGLVersion = 0;
};
static const Info& getHardwareAccelerationSupportedInfo();
static bool isHardwareAccelerationSupported();
static constexpr int REQUIRED_OPENGL_MAJOR_VERSION = 3;
static constexpr int REQUIRED_OPENGL_MINOR_VERSION = 2;
private:
static PDFCachedItem<Info> s_info;
};
/// Renders the PDF page on the painter, or onto an image.
class PDF4QTLIBCORESHARED_EXPORT PDFRenderer
{
@ -165,9 +137,7 @@ private:
PDFMeshQualitySettings m_meshQualitySettings;
};
/// Renders PDF pages to bitmap images (QImage). It can use OpenGL for painting,
/// if it is enabled, if this is the case, offscreen rendering to framebuffer
/// is used.
/// Renders PDF pages to bitmap images (QImage).
/// \note Construct this object only in main GUI thread
class PDF4QTLIBCORESHARED_EXPORT PDFRasterizer : public QObject
{
@ -180,22 +150,9 @@ public:
explicit PDFRasterizer(QObject* parent);
virtual ~PDFRasterizer() override;
/// Resets the renderer. This function must be called from main GUI thread,
/// it cannot be called from deferred threads, because it can create hidden
/// window (offscreen surface). If hardware renderer is required, and
/// none is available, then software renderer is used.
/// \param useOpenGL Use OpenGL for rendering (ignored if not available)
/// \param surfaceFormat Surface format to render
void reset(bool useOpenGL, const QSurfaceFormat& surfaceFormat);
enum Feature
{
UseOpenGL = 0x0001, ///< Use OpenGL for rendering
ValidOpenGL = 0x0002, ///< OpenGL is initialized and valid
FailedOpenGL = 0x0004, ///< OpenGL creation has failed
};
Q_DECLARE_FLAGS(Features, Feature)
/// Resets the renderer.
/// \param rendererEngine Renderer engine type
void reset(RendererEngine rendererEngine);
/// Renders page to the image of given size. If some error occurs, then
/// empty image is returned. Warning: this function can modify this object,
@ -217,18 +174,7 @@ public:
PageRotation extraRotation);
private:
#ifdef PDF4QT_ENABLE_OPENGL
void initializeOpenGL();
void releaseOpenGL();
#endif
Features m_features;
#ifdef PDF4QT_ENABLE_OPENGL
QSurfaceFormat m_surfaceFormat;
QOffscreenSurface* m_surface;
QOpenGLContext* m_context;
QOpenGLFramebufferObject* m_fbo;
#endif
RendererEngine m_rendererEngine;
};
/// Simple structure for storing rendered page images
@ -267,8 +213,7 @@ public:
/// \param features Renderer features
/// \param meshQualitySettings Mesh quality settings
/// \param rasterizerCount Number of rasterizers
/// \param useOpenGL Use OpenGL for rendering?
/// \param surfaceFormat Surface format
/// \param rendererEngine Renderer engine
/// \param parent Parent object
explicit PDFRasterizerPool(const PDFDocument* document,
PDFFontCache* fontCache,
@ -277,8 +222,7 @@ public:
PDFRenderer::Features features,
const PDFMeshQualitySettings& meshQualitySettings,
int rasterizerCount,
bool useOpenGL,
const QSurfaceFormat& surfaceFormat,
RendererEngine rendererEngine,
QObject* parent);
/// Acquire rasterizer. This function is thread safe.