fenix/PDF4QT
1
0
Fork 0
mirror of https://github.com/JakubMelka/PDF4QT.git synced 2025-06-05 21:59:17 +02:00
Code Issues Packages Projects Releases Wiki Activity

Soft mask implementation

Browse Source
This commit is contained in:
Jakub Melka
2021-03-24 19:55:31 +01:00
parent 67872a532f
commit 2e9459dfa9
6 changed files with 426 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files

49
Pdf4QtLib/sources/pdftransparencyrenderer.h
View File

@ -227,6 +227,15 @@ public:
/// \param channel Channel
PDFFloatBitmap extractSpotChannel(uint8_t channel) const;
/// Extract opacity channel. If bitmap doesn't have opacity channel,
/// opaque opacity bitmap of same size is returned.
PDFFloatBitmap extractOpacityChannel() const;
/// Extract luminosity channel as opacity channel. Bitmap should have
/// 1 (gray), 3 (red, green, blue) or 4 (cyan, magenta, yellow, black)
/// process colors. Otherwise opaque bitmap of same size is returned.
PDFFloatBitmap extractLuminosityChannel() const;
/// Copies channel from source bitmap to target channel in this bitmap
/// \param sourceBitmap Source bitmap
/// \param channelFrom Source channel
@ -266,7 +275,7 @@ public:
PDFFloatBitmap& target,
const PDFFloatBitmap& backdrop,
const PDFFloatBitmap& initialBackdrop,
PDFFloatBitmap& softMask,
const PDFFloatBitmap& softMask,
bool alphaIsShape,
PDFColorComponent constantAlpha,
BlendMode mode,
@ -657,11 +666,39 @@ private:
PDFReal getShapeFilling() const;
PDFReal getOpacityFilling() const;
struct PDFTransparencySoftMaskImpl : public QSharedData
{
PDFTransparencySoftMaskImpl() = default;
PDFTransparencySoftMaskImpl(bool isOpaque, PDFFloatBitmap softMask) :
isOpaque(isOpaque),
softMask(qMove(softMask))
{
}
bool isOpaque = false;
PDFFloatBitmap softMask;
};
class PDFTransparencySoftMask
{
public:
PDFTransparencySoftMask() { m_data = new PDFTransparencySoftMaskImpl; }
PDFTransparencySoftMask(bool isOpaque, PDFFloatBitmap softMask) { m_data = new PDFTransparencySoftMaskImpl(isOpaque, qMove(softMask)); }
bool isOpaque() const { return m_data->isOpaque; }
const PDFFloatBitmap* getSoftMask() const { return &m_data->softMask; }
void makeOpaque();
private:
QSharedDataPointer<PDFTransparencySoftMaskImpl> m_data;
};
struct PDFTransparencyGroupPainterData
{
void makeInitialBackdropTransparent();
void makeImmediateBackdropTransparent();
void makeSoftMaskOpaque();
PDFTransparencyGroup group;
bool alphaIsShape = false;
@ -672,7 +709,7 @@ private:
RenderingIntent renderingIntent = RenderingIntent::RelativeColorimetric;
PDFFloatBitmapWithColorSpace initialBackdrop; ///< Initial backdrop
PDFFloatBitmapWithColorSpace immediateBackdrop; ///< Immediate backdrop
PDFFloatBitmap softMask; ///< Soft mask for this group
PDFTransparencySoftMask softMask; ///< Soft mask for this group
PDFColorSpacePointer blendColorSpace;
bool filterColorsUsingMask = false;
uint32_t activeColorMask = PDFPixelFormat::getAllColorsMask();
@ -682,7 +719,7 @@ private:
struct PDFTransparencyPainterState
{
QPainterPath clipPath; ///< Clipping path in device state coordinates
PDFFloatBitmap softMask;
PDFTransparencySoftMask softMask;
};
struct PDFMappedColor
@ -816,6 +853,10 @@ private:
/// \param imageData Soft mask data
PDFFloatBitmap getAlphaMaskFromSoftMask(const PDFImageData& softMask);
/// Processes soft mask and sets it as active
/// \param softMask Soft mask
void processSoftMask(const PDFDictionary* softMask);
static void createOpaqueBitmap(PDFFloatBitmap& bitmap);
static void createPaperBitmap(PDFFloatBitmap& bitmap, const PDFRGB& paperColor);
static void createOpaqueSoftMask(PDFFloatBitmap& softMask, size_t width, size_t height) { softMask = PDFFloatBitmap::createOpaqueSoftMask(width, height); }