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Texture paiting

This commit is contained in:
Jakub Melka 2021-02-25 19:57:23 +01:00
parent 4b291d6db8
commit ea3908792b
3 changed files with 196 additions and 4 deletions
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4
Pdf4QtLib/sources/pdfpainter.cpp
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@ -323,7 +323,7 @@ void PDFPainter::performImagePainting(const QImage& image)
{
// Test, if we can use smooth images. We can use them under following conditions:
// 1) Transformed rectangle is not skewed or deformed (so vectors (0, 1) and (1, 0) are orthogonal)
// 2) Image enlargement is not too big (so we doesn't run out of memory)
// 2) We are shrinking the image
QMatrix matrix = m_painter->worldMatrix();
QLineF mappedWidthVector = matrix.map(QLineF(0, 0, 1, 0));
@ -338,7 +338,7 @@ void PDFPainter::performImagePainting(const QImage& image)
const int newPixels = newWidth * newHeight;
const int oldPixels = image.width() * image.height();
if (newPixels < oldPixels * 8)
if (newPixels < oldPixels)
{
QSize size = adjustedImage.size();
QSize adjustedImageSize = size.scaled(newWidth, newHeight, Qt::KeepAspectRatio);

166
Pdf4QtLib/sources/pdftransparencyrenderer.cpp
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@ -1010,6 +1010,61 @@ void PDFTransparencyRenderer::performPixelSampling(const PDFReal shape,
}
}
void PDFTransparencyRenderer::performFillFragmentFromTexture(const PDFReal shape,
const PDFReal opacity,
const uint8_t shapeChannel,
const uint8_t opacityChannel,
const uint8_t colorChannelStart,
const uint8_t colorChannelEnd,
int x,
int y,
const QMatrix& worldToTextureMatrix,
const PDFFloatBitmap& texture,
const PDFPainterPathSampler& clipSampler)
{
// Get pixel buffer from texture
QPointF sourcePoint(x, y);
QPointF texturePoint = sourcePoint * worldToTextureMatrix;
if (texturePoint.x() < 0.0 ||
texturePoint.x() >= texture.getWidth() ||
texturePoint.y() < 0.0 ||
texturePoint.y() >= texture.getHeight())
{
// Fragment is outside of the texture
return;
}
const size_t texelCoordinateX = qFloor(texturePoint.x());
const size_t texelCoordinateY = qFloor(texturePoint.y());
PDFConstColorBuffer texel = texture.getPixel(texelCoordinateX, texelCoordinateY);
const PDFColorComponent clipValue = clipSampler.sample(QPoint(x, y));
const PDFColorComponent objectShapeValue = texel[shapeChannel];
const PDFColorComponent objectOpacityValue = texel[opacityChannel];
const PDFColorComponent shapeValue = objectShapeValue * clipValue * shape;
const PDFColorComponent opacityValue = objectOpacityValue * clipValue * shape * opacity;
if (shapeValue > 0.0f)
{
// We consider old object shape - we use Union function to
// set shape channel value.
PDFColorBuffer pixel = m_drawBuffer.getPixel(x, y);
pixel[shapeChannel] = PDFBlendFunction::blend_Union(shapeValue, pixel[shapeChannel]);
pixel[opacityChannel] = opacityValue;
// Copy color
for (uint8_t colorChannelIndex = colorChannelStart; colorChannelIndex < colorChannelEnd; ++colorChannelIndex)
{
pixel[colorChannelIndex] = texel[colorChannelIndex];
}
m_drawBuffer.markPixelActiveColorMask(x, y, texture.getPixelActiveColorMask(texelCoordinateX, texelCoordinateY));
}
}
void PDFTransparencyRenderer::collapseSpotColorsToDeviceColors(PDFFloatBitmapWithColorSpace& bitmap)
{
PDFPixelFormat pixelFormat = bitmap.getPixelFormat();
@ -1996,6 +2051,117 @@ bool PDFTransparencyRenderer::performOriginalImagePainting(const PDFImage& image
{
PDFFloatBitmap texture = getImage(image);
if (m_settings.flags.testFlag(PDFTransparencyRendererSettings::SmoothImageTransformation) && image.isInterpolated())
{
// Test, if we can use smooth images. We can use them under following conditions:
// 1) Transformed rectangle is not skewed or deformed (so vectors (0, 1) and (1, 0) are orthogonal)
// 2) We are shrinking the image
// 3) Aspect ratio of the image is the same
QMatrix matrix = getCurrentWorldMatrix();
QLineF mappedWidthVector = matrix.map(QLineF(0, 0, texture.getWidth(), 0));
QLineF mappedHeightVector = matrix.map(QLineF(0, 0, 0, texture.getHeight()));
qreal angle = mappedWidthVector.angleTo(mappedHeightVector);
if (qFuzzyCompare(angle, 90.0))
{
// Image is not skewed, so we if we are shrinking the image
const qreal originalWidth = texture.getWidth();
const qreal originalHeight = texture.getHeight();
const qreal originalRatio = originalWidth / originalHeight;
const qreal transformedWidth = mappedWidthVector.length();
const qreal transformedHeight = mappedHeightVector.length();
const qreal transformedRatio = transformedWidth / transformedHeight;
if (qFuzzyCompare(originalRatio, transformedRatio) && originalWidth > transformedWidth && originalHeight > transformedHeight)
{
uint32_t activeColorMask = texture.getPixelActiveColorMask(0, 0);
texture = texture.resize(qCeil(transformedWidth), qCeil(transformedHeight), Qt::SmoothTransformation);
texture.setColorActivity(activeColorMask);
}
}
}
QMatrix imageTransform(1.0 / qreal(texture.getWidth()), 0, 0, 1.0 / qreal(texture.getHeight()), 0, 0);
QMatrix worldMatrix = imageTransform * getCurrentWorldMatrix();
// Because Qt uses opposite axis direction than PDF, then we must transform the y-axis
// to the opposite (so the image is then unchanged)
worldMatrix.translate(0.0, texture.getHeight());
worldMatrix.scale(1, -1);
QPolygonF imagePolygon;
imagePolygon << QPointF(0.0, 0.0);
imagePolygon << QPointF(0.0, texture.getHeight());
imagePolygon << QPointF(texture.getWidth(), texture.getHeight());
imagePolygon << QPointF(texture.getWidth(), 0.0);
QMatrix worldToTextureMatrix = worldMatrix.inverted();
QRectF boundingRectangle = worldMatrix.map(imagePolygon).boundingRect();
QRect fillRect = getActualFillRect(boundingRectangle);
const PDFReal shape = getShapeFilling();
const PDFReal opacity = getOpacityFilling();
PDFPixelFormat format = m_drawBuffer.getPixelFormat();
Q_ASSERT(format.hasShapeChannel());
Q_ASSERT(format.hasOpacityChannel());
Q_ASSERT(format == texture.getPixelFormat());
const uint8_t shapeChannel = format.getShapeChannelIndex();
const uint8_t opacityChannel = format.getOpacityChannelIndex();
const uint8_t colorChannelStart = format.getColorChannelIndexStart();
const uint8_t colorChannelEnd = format.getColorChannelIndexEnd();
// Fill rect may be, or may not be valid. It depends on the painter path
// and world matrix. Path can be translated outside of the paint area.
if (fillRect.isValid())
{
PDFPainterPathSampler clipSampler(m_painterStateStack.top().clipPath, m_settings.samplesCount, 1.0f, fillRect, m_settings.flags.testFlag(PDFTransparencyRendererSettings::PrecisePathSampler));
if (isMultithreadedPathSamplingUsed(fillRect))
{
if (fillRect.width() > fillRect.height())
{
// Columns
PDFIntegerRange<int> range(fillRect.left(), fillRect.right() + 1);
auto processEntry = [&, this](int x)
{
for (int y = fillRect.top(); y <= fillRect.bottom(); ++y)
{
performFillFragmentFromTexture(shape, opacity, shapeChannel, opacityChannel, colorChannelStart, colorChannelEnd, x, y, worldToTextureMatrix, texture, clipSampler);
}
};
PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Content, range.begin(), range.end(), processEntry);
}
else
{
// Rows
PDFIntegerRange<int> range(fillRect.top(), fillRect.bottom() + 1);
auto processEntry = [&, this](int y)
{
for (int x = fillRect.left(); x <= fillRect.right(); ++x)
{
performFillFragmentFromTexture(shape, opacity, shapeChannel, opacityChannel, colorChannelStart, colorChannelEnd, x, y, worldToTextureMatrix, texture, clipSampler);
}
};
PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Content, range.begin(), range.end(), processEntry);
}
}
else
{
for (int x = fillRect.left(); x <= fillRect.right(); ++x)
{
for (int y = fillRect.top(); y <= fillRect.bottom(); ++y)
{
performFillFragmentFromTexture(shape, opacity, shapeChannel, opacityChannel, colorChannelStart, colorChannelEnd, x, y, worldToTextureMatrix, texture, clipSampler);
}
}
}
m_drawBuffer.modify(fillRect, true, false);
flushDrawBuffer();
}
return true;
}

30
Pdf4QtLib/sources/pdftransparencyrenderer.h
View File

@ -526,7 +526,8 @@ struct PDFTransparencyRendererSettings
/// colors to the CMYK color space.
SeparationSimulation = 0x0004,
/// Use active color mask
/// Use active color mask (so we can clear channels,
/// which are not active)
ActiveColorMask = 0x0008,
/// Use smooth image transform, if it is possible. For
@ -709,7 +710,7 @@ private:
/// \param colorChannelStart Color channel start (draw buffer)
/// \param colorChannelEnd Color channel end (draw buffer)
/// \param fillColor Fill color
/// \param clipSample Clipping sampler
/// \param clipSampler Clipping sampler
/// \param pathSampler Path sampler
void performPixelSampling(const PDFReal shape,
const PDFReal opacity,
@ -723,6 +724,31 @@ private:
const PDFPainterPathSampler& clipSampler,
const PDFPainterPathSampler& pathSampler);
/// Performs fragment fill from texture. Sampled pixel is painted
/// into the draw buffer.
/// \param shape Constant shape value
/// \param opacity Constant opacity value
/// \param shapeChannel Shape channel (draw buffer)
/// \param opacityChannel Opacity channel (draw buffer)
/// \param colorChannelStart Color channel start (draw buffer)
/// \param colorChannelEnd Color channel end (draw buffer)
/// \param x Horizontal coordinate of the fragment pixel
/// \param y Vertical coordinate of the fragment pixel
/// \param worldToTextureMatrix World to texture matrix
/// \param texture Texture
/// \param clipSampler Clipping sampler
void performFillFragmentFromTexture(const PDFReal shape,
const PDFReal opacity,
const uint8_t shapeChannel,
const uint8_t opacityChannel,
const uint8_t colorChannelStart,
const uint8_t colorChannelEnd,
int x,
int y,
const QMatrix& worldToTextureMatrix,
const PDFFloatBitmap& texture,
const PDFPainterPathSampler& clipSampler);
/// Collapses spot colors to device colors
/// \param data Bitmap with data
void collapseSpotColorsToDeviceColors(PDFFloatBitmapWithColorSpace& bitmap);