X-Git-Url: http://review.tizen.org/git/?p=platform%2Fcore%2Fuifw%2Fdali-toolkit.git;a=blobdiff_plain;f=dali-toolkit%2Finternal%2Ftext%2Frendering%2Ftext-typesetter.cpp;h=05b4a674e002e8be643db1e0f6e6f31b2a9fd0d2;hp=6911686da26aa9a53597851c64359fb3f2108beb;hb=583538010c34b92f80989021201484fdf9e590a9;hpb=534e542d7dcc1a1507a0e5e6845d49c06a15d326 diff --git a/dali-toolkit/internal/text/rendering/text-typesetter.cpp b/dali-toolkit/internal/text/rendering/text-typesetter.cpp old mode 100644 new mode 100755 index 6911686..05b4a67 --- a/dali-toolkit/internal/text/rendering/text-typesetter.cpp +++ b/dali-toolkit/internal/text/rendering/text-typesetter.cpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 2016 Samsung Electronics Co., Ltd. + * Copyright (c) 2020 Samsung Electronics Co., Ltd. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -18,8 +18,14 @@ // CLASS HEADER #include +// EXTERNAL INCLUDES +#include +#include +#include + // INTERNAL INCLUDES #include +#include namespace Dali { @@ -30,6 +36,393 @@ namespace Toolkit namespace Text { +namespace +{ + +/** + * @brief Data struct used to set the buffer of the glyph's bitmap into the final bitmap's buffer. + */ +struct GlyphData +{ + Devel::PixelBuffer bitmapBuffer; ///< The buffer of the whole bitmap. The format is RGBA8888. + Vector2* position; ///< The position of the glyph. + TextAbstraction::FontClient::GlyphBufferData glyphBitmap; ///< The glyph's bitmap. + unsigned int width; ///< The bitmap's width. + unsigned int height; ///< The bitmap's height. + int horizontalOffset; ///< The horizontal offset to be added to the 'x' glyph's position. + int verticalOffset; ///< The vertical offset to be added to the 'y' glyph's position. +}; + +/** + * @brief Sets the glyph's buffer into the bitmap's buffer. + * + * @param[in] data Struct which contains the glyph's data and the bitmap's data. + * @param[in] position The position of the glyph. + * @param[in] color The color of the glyph. + * @param[in] style The style of the text. + * @param[in] pixelFormat The format of the pixel in the image that the text is rendered as (i.e. either Pixel::BGRA8888 or Pixel::L8). + */ +void TypesetGlyph( GlyphData& data, + const Vector2* const position, + const Vector4* const color, + Typesetter::Style style, + Pixel::Format pixelFormat ) +{ + if( ( 0u == data.glyphBitmap.width ) || ( 0u == data.glyphBitmap.height ) ) + { + // Nothing to do if the width or height of the buffer is zero. + return; + } + + const int widthMinusOne = static_cast( data.width - 1u ); + const int heightMinusOne = static_cast( data.height - 1u ); + + if ( Pixel::RGBA8888 == pixelFormat ) + { + // Whether the given glyph is a color one. + const bool isColorGlyph = data.glyphBitmap.isColorEmoji || data.glyphBitmap.isColorBitmap; + const uint32_t glyphPixelSize = Pixel::GetBytesPerPixel( data.glyphBitmap.format ); + const uint32_t alphaIndex = glyphPixelSize - 1u; + const bool swapChannelsBR = Pixel::BGRA8888 == data.glyphBitmap.format; + + // Pointer to the color glyph if there is one. + const uint32_t* const colorGlyphBuffer = isColorGlyph ? reinterpret_cast( data.glyphBitmap.buffer ) : NULL; + + // Initial vertical offset. + const int yOffset = data.verticalOffset + position->y; + + uint32_t* bitmapBuffer = reinterpret_cast< uint32_t* >( data.bitmapBuffer.GetBuffer() ); + + // Traverse the pixels of the glyph line per line. + for( int lineIndex = 0, glyphHeight = static_cast( data.glyphBitmap.height ); lineIndex < glyphHeight; ++lineIndex ) + { + const int yOffsetIndex = yOffset + lineIndex; + if( ( 0 > yOffsetIndex ) || ( yOffsetIndex > heightMinusOne ) ) + { + // Do not write out of bounds. + continue; + } + + const int verticalOffset = yOffsetIndex * data.width; + const int xOffset = data.horizontalOffset + position->x; + const int glyphBufferOffset = lineIndex * static_cast( data.glyphBitmap.width ); + for( int index = 0, glyphWidth = static_cast( data.glyphBitmap.width ); index < glyphWidth; ++index ) + { + const int xOffsetIndex = xOffset + index; + if( ( 0 > xOffsetIndex ) || ( xOffsetIndex > widthMinusOne ) ) + { + // Don't write out of bounds. + continue; + } + + if( isColorGlyph ) + { + // Retrieves the color from the color glyph. + uint32_t packedColorGlyph = *( colorGlyphBuffer + glyphBufferOffset + index ); + uint8_t* packedColorGlyphBuffer = reinterpret_cast( &packedColorGlyph ); + + // Update the alpha channel. + if( Typesetter::STYLE_MASK == style || Typesetter::STYLE_OUTLINE == style ) // Outline not shown for color glyph + { + // Create an alpha mask for color glyph. + *( packedColorGlyphBuffer + 3u ) = 0u; + *( packedColorGlyphBuffer + 2u ) = 0u; + *( packedColorGlyphBuffer + 1u ) = 0u; + *packedColorGlyphBuffer = 0u; + } + else + { + const uint8_t colorAlpha = static_cast( color->a * static_cast( *( packedColorGlyphBuffer + 3u ) ) ); + *( packedColorGlyphBuffer + 3u ) = colorAlpha; + + if( Typesetter::STYLE_SHADOW == style ) + { + // The shadow of color glyph needs to have the shadow color. + *( packedColorGlyphBuffer + 2u ) = static_cast( color->b * colorAlpha ); + *( packedColorGlyphBuffer + 1u ) = static_cast( color->g * colorAlpha ); + *packedColorGlyphBuffer = static_cast( color->r * colorAlpha ); + } + else + { + if( swapChannelsBR ) + { + std::swap( *packedColorGlyphBuffer, *( packedColorGlyphBuffer + 2u ) ); // Swap B and R. + } + + *( packedColorGlyphBuffer + 2u ) = ( *( packedColorGlyphBuffer + 2u ) * colorAlpha / 255 ); + *( packedColorGlyphBuffer + 1u ) = ( *( packedColorGlyphBuffer + 1u ) * colorAlpha / 255 ); + *packedColorGlyphBuffer = ( *( packedColorGlyphBuffer ) * colorAlpha / 255 ); + + if( data.glyphBitmap.isColorBitmap ) + { + *( packedColorGlyphBuffer + 2u ) = static_cast( *( packedColorGlyphBuffer + 2u ) * color->b ); + *( packedColorGlyphBuffer + 1u ) = static_cast( *( packedColorGlyphBuffer + 1u ) * color->g ); + *packedColorGlyphBuffer = static_cast( *packedColorGlyphBuffer * color->r ); + } + } + } + + // Set the color into the final pixel buffer. + *( bitmapBuffer + verticalOffset + xOffsetIndex ) = packedColorGlyph; + } + else + { + // Pack the given color into a 32bit buffer. The alpha channel will be updated later for each pixel. + // The format is RGBA8888. + uint32_t packedColor = 0u; + uint8_t* packedColorBuffer = reinterpret_cast( &packedColor ); + + // Update the alpha channel. + const uint8_t alpha = *( data.glyphBitmap.buffer + glyphPixelSize * ( glyphBufferOffset + index ) + alphaIndex ); + + // Copy non-transparent pixels only + if ( alpha > 0u ) + { + // Check alpha of overlapped pixels + uint32_t& currentColor = *( bitmapBuffer + verticalOffset + xOffsetIndex ); + uint8_t* packedCurrentColorBuffer = reinterpret_cast( ¤tColor ); + + // For any pixel overlapped with the pixel in previous glyphs, make sure we don't + // overwrite a previous bigger alpha with a smaller alpha (in order to avoid + // semi-transparent gaps between joint glyphs with overlapped pixels, which could + // happen, for example, in the RTL text when we copy glyphs from right to left). + uint8_t currentAlpha = *( packedCurrentColorBuffer + 3u ); + currentAlpha = std::max( currentAlpha, alpha ); + + // Color is pre-muliplied with its alpha. + *( packedColorBuffer + 3u ) = static_cast( color->a * currentAlpha ); + *( packedColorBuffer + 2u ) = static_cast( color->b * currentAlpha ); + *( packedColorBuffer + 1u ) = static_cast( color->g * currentAlpha ); + *( packedColorBuffer ) = static_cast( color->r * currentAlpha ); + + // Set the color into the final pixel buffer. + currentColor = packedColor; + } + } + } + } + } + else + { + // Whether the given glyph is a color one. + const bool isColorGlyph = data.glyphBitmap.isColorEmoji || data.glyphBitmap.isColorBitmap; + const uint32_t glyphPixelSize = Pixel::GetBytesPerPixel( data.glyphBitmap.format ); + const uint32_t alphaIndex = glyphPixelSize - 1u; + + // Initial vertical offset. + const int yOffset = data.verticalOffset + position->y; + + uint8_t* bitmapBuffer = reinterpret_cast< uint8_t* >( data.bitmapBuffer.GetBuffer() ); + + // Traverse the pixels of the glyph line per line. + for( int lineIndex = 0, glyphHeight = static_cast( data.glyphBitmap.height ); lineIndex < glyphHeight; ++lineIndex ) + { + const int yOffsetIndex = yOffset + lineIndex; + if( ( 0 > yOffsetIndex ) || ( yOffsetIndex > heightMinusOne ) ) + { + // Do not write out of bounds. + continue; + } + + const int verticalOffset = yOffsetIndex * data.width; + const int xOffset = data.horizontalOffset + position->x; + const int glyphBufferOffset = lineIndex * static_cast( data.glyphBitmap.width ); + for( int index = 0, glyphWidth = static_cast( data.glyphBitmap.width ); index < glyphWidth; ++index ) + { + const int xOffsetIndex = xOffset + index; + if( ( 0 > xOffsetIndex ) || ( xOffsetIndex > widthMinusOne ) ) + { + // Don't write out of bounds. + continue; + } + + if ( !isColorGlyph ) + { + // Update the alpha channel. + const uint8_t alpha = *( data.glyphBitmap.buffer + glyphPixelSize * ( glyphBufferOffset + index ) + alphaIndex ); + + // Copy non-transparent pixels only + if ( alpha > 0u ) + { + // Check alpha of overlapped pixels + uint8_t& currentAlpha = *( bitmapBuffer + verticalOffset + xOffsetIndex ); + + // For any pixel overlapped with the pixel in previous glyphs, make sure we don't + // overwrite a previous bigger alpha with a smaller alpha (in order to avoid + // semi-transparent gaps between joint glyphs with overlapped pixels, which could + // happen, for example, in the RTL text when we copy glyphs from right to left). + currentAlpha = std::max( currentAlpha, alpha ); + } + } + } + } + } +} + +bool IsGlyphUnderlined( GlyphIndex index, + const Vector& underlineRuns ) +{ + for( Vector::ConstIterator it = underlineRuns.Begin(), + endIt = underlineRuns.End(); + it != endIt; + ++it ) + { + const GlyphRun& run = *it; + + if( ( run.glyphIndex <= index ) && ( index < run.glyphIndex + run.numberOfGlyphs ) ) + { + return true; + } + } + + return false; +} + +/// Helper method to fetch the underline metrics for the specified font glyph +void FetchFontUnderlineMetrics( + TextAbstraction::FontClient& fontClient, + const GlyphInfo* const glyphInfo, + float& currentUnderlinePosition, + const float underlineHeight, + float& currentUnderlineThickness, + float& maxUnderlineThickness, + FontId& lastUnderlinedFontId) +{ + FontMetrics fontMetrics; + fontClient.GetFontMetrics( glyphInfo->fontId, fontMetrics ); + currentUnderlinePosition = ceil( fabsf( fontMetrics.underlinePosition ) ); + const float descender = ceil( fabsf( fontMetrics.descender ) ); + + if( fabsf( underlineHeight ) < Math::MACHINE_EPSILON_1000 ) + { + currentUnderlineThickness = fontMetrics.underlineThickness; + + // Ensure underline will be at least a pixel high + if ( currentUnderlineThickness < 1.0f ) + { + currentUnderlineThickness = 1.0f; + } + else + { + currentUnderlineThickness = ceil( currentUnderlineThickness ); + } + } + + // The underline thickness should be the max underline thickness of all glyphs of the line. + if ( currentUnderlineThickness > maxUnderlineThickness ) + { + maxUnderlineThickness = currentUnderlineThickness; + } + + // Clamp the underline position at the font descender and check for ( as EFL describes it ) a broken font + if( currentUnderlinePosition > descender ) + { + currentUnderlinePosition = descender; + } + + if( fabsf( currentUnderlinePosition ) < Math::MACHINE_EPSILON_1000 ) + { + // Move offset down by one ( EFL behavior ) + currentUnderlinePosition = 1.0f; + } + + lastUnderlinedFontId = glyphInfo->fontId; +} + +/// Draws the specified color to the pixel buffer +void WriteColorToPixelBuffer( + GlyphData& glyphData, + uint32_t* bitmapBuffer, + const Vector4& color, + const unsigned int x, + const unsigned int y) +{ + // Always RGBA image for text with styles + uint32_t pixel = *( bitmapBuffer + y * glyphData.width + x ); + uint8_t* pixelBuffer = reinterpret_cast( &pixel ); + + // Write the color to the pixel buffer + uint8_t colorAlpha = static_cast< uint8_t >( color.a * 255.f ); + *( pixelBuffer + 3u ) = colorAlpha; + *( pixelBuffer + 2u ) = static_cast< uint8_t >( color.b * colorAlpha ); + *( pixelBuffer + 1u ) = static_cast< uint8_t >( color.g * colorAlpha ); + *( pixelBuffer ) = static_cast< uint8_t >( color.r * colorAlpha ); + + *( bitmapBuffer + y * glyphData.width + x ) = pixel; +} + +/// Draws the specified underline color to the buffer +void DrawUnderline( + const Vector4& underlineColor, + const unsigned int bufferWidth, + const unsigned int bufferHeight, + GlyphData& glyphData, + const float baseline, + const float currentUnderlinePosition, + const float maxUnderlineThickness, + const float lineExtentLeft, + const float lineExtentRight) +{ + int underlineYOffset = glyphData.verticalOffset + baseline + currentUnderlinePosition; + uint32_t* bitmapBuffer = reinterpret_cast< uint32_t* >( glyphData.bitmapBuffer.GetBuffer() ); + + for( unsigned int y = underlineYOffset; y < underlineYOffset + maxUnderlineThickness; y++ ) + { + if( y > bufferHeight - 1 ) + { + // Do not write out of bounds. + break; + } + + for( unsigned int x = glyphData.horizontalOffset + lineExtentLeft; x <= glyphData.horizontalOffset + lineExtentRight; x++ ) + { + if( x > bufferWidth - 1 ) + { + // Do not write out of bounds. + break; + } + + WriteColorToPixelBuffer(glyphData, bitmapBuffer, underlineColor, x, y); + } + } +} + +/// Draws the background color to the buffer +void DrawBackgroundColor( + Vector4 backgroundColor, + const unsigned int bufferWidth, + const unsigned int bufferHeight, + GlyphData& glyphData, + const float baseline, + const LineRun& line, + const float lineExtentLeft, + const float lineExtentRight) +{ + uint32_t* bitmapBuffer = reinterpret_cast< uint32_t* >( glyphData.bitmapBuffer.GetBuffer() ); + + for( int y = glyphData.verticalOffset + baseline - line.ascender; y < glyphData.verticalOffset + baseline - line.descender; y++ ) + { + if( ( y < 0 ) || ( y > static_cast(bufferHeight - 1) ) ) + { + // Do not write out of bounds. + continue; + } + + for( int x = glyphData.horizontalOffset + lineExtentLeft; x <= glyphData.horizontalOffset + lineExtentRight; x++ ) + { + if( ( x < 0 ) || ( x > static_cast(bufferWidth - 1) ) ) + { + // Do not write out of bounds. + continue; + } + + WriteColorToPixelBuffer(glyphData, bitmapBuffer, backgroundColor, x, y); + } + } +} + +} // namespace + TypesetterPtr Typesetter::New( const ModelInterface* const model ) { return TypesetterPtr( new Typesetter( model ) ); @@ -40,6 +433,484 @@ ViewModel* Typesetter::GetViewModel() return mModel; } +PixelData Typesetter::Render( const Vector2& size, Toolkit::DevelText::TextDirection::Type textDirection, RenderBehaviour behaviour, bool ignoreHorizontalAlignment, Pixel::Format pixelFormat ) +{ + // @todo. This initial implementation for a TextLabel has only one visible page. + + // Elides the text if needed. + mModel->ElideGlyphs(); + + // Retrieves the layout size. + const Size& layoutSize = mModel->GetLayoutSize(); + + const int outlineWidth = static_cast( mModel->GetOutlineWidth() ); + + // Set the offset for the horizontal alignment according to the text direction and outline width. + int penX = 0; + + switch( mModel->GetHorizontalAlignment() ) + { + case HorizontalAlignment::BEGIN: + { + // No offset to add. + break; + } + case HorizontalAlignment::CENTER: + { + penX += ( textDirection == Toolkit::DevelText::TextDirection::LEFT_TO_RIGHT ) ? -outlineWidth : outlineWidth; + break; + } + case HorizontalAlignment::END: + { + penX += ( textDirection == Toolkit::DevelText::TextDirection::LEFT_TO_RIGHT ) ? -outlineWidth * 2 : outlineWidth * 2; + break; + } + } + + // Set the offset for the vertical alignment. + int penY = 0u; + + switch( mModel->GetVerticalAlignment() ) + { + case VerticalAlignment::TOP: + { + // No offset to add. + break; + } + case VerticalAlignment::CENTER: + { + penY = static_cast( 0.5f * ( size.height - layoutSize.height ) ); + penY = penY < 0.f ? 0.f : penY; + break; + } + case VerticalAlignment::BOTTOM: + { + penY = static_cast( size.height - layoutSize.height ); + break; + } + } + + // Calculate vertical line alignment + switch( mModel->GetVerticalLineAlignment() ) + { + case DevelText::VerticalLineAlignment::TOP: + { + break; + } + case DevelText::VerticalLineAlignment::MIDDLE: + { + const auto& line = *mModel->GetLines(); + penY -= line.descender; + penY += static_cast(line.lineSpacing*0.5f + line.descender); + break; + } + case DevelText::VerticalLineAlignment::BOTTOM: + { + const auto& line = *mModel->GetLines(); + const auto lineHeight = line.ascender + (-line.descender) + line.lineSpacing; + penY += static_cast(lineHeight - (line.ascender - line.descender)); + break; + } + } + + // Generate the image buffers of the text for each different style first, + // then combine all of them together as one final image buffer. We try to + // do all of these in CPU only, so that once the final texture is generated, + // no calculation is needed in GPU during each frame. + + const unsigned int bufferWidth = static_cast( size.width ); + const unsigned int bufferHeight = static_cast( size.height ); + + const unsigned int bufferSizeInt = bufferWidth * bufferHeight; + const unsigned int bufferSizeChar = 4u * bufferSizeInt; + + Length numberOfGlyphs = mModel->GetNumberOfGlyphs(); + + Devel::PixelBuffer imageBuffer; + + if( RENDER_MASK == behaviour ) + { + // Generate the image buffer as an alpha mask for color glyphs. + imageBuffer = CreateImageBuffer( bufferWidth, bufferHeight, Typesetter::STYLE_MASK, ignoreHorizontalAlignment, pixelFormat, penX, penY, 0u, numberOfGlyphs - 1 ); + } + else if( RENDER_NO_TEXT == behaviour ) + { + // Generate an empty image buffer so that it can been combined with the image buffers for styles + imageBuffer = Devel::PixelBuffer::New( bufferWidth, bufferHeight, Pixel::RGBA8888 ); + memset( imageBuffer.GetBuffer(), 0u, bufferSizeChar ); + } + else + { + // Generate the image buffer for the text with no style. + imageBuffer = CreateImageBuffer( bufferWidth, bufferHeight, Typesetter::STYLE_NONE, ignoreHorizontalAlignment, pixelFormat, penX, penY, 0u, numberOfGlyphs -1 ); + } + + if ( ( RENDER_NO_STYLES != behaviour ) && ( RENDER_MASK != behaviour ) ) + { + + // Generate the outline if enabled + const uint16_t outlineWidth = mModel->GetOutlineWidth(); + if ( outlineWidth != 0u ) + { + // Create the image buffer for outline + Devel::PixelBuffer outlineImageBuffer = CreateImageBuffer( bufferWidth, bufferHeight, Typesetter::STYLE_OUTLINE, ignoreHorizontalAlignment, pixelFormat, penX, penY, 0u, numberOfGlyphs -1 ); + + // Combine the two buffers + imageBuffer = CombineImageBuffer( imageBuffer, outlineImageBuffer, bufferWidth, bufferHeight ); + } + + // @todo. Support shadow and underline for partial text later on. + + // Generate the shadow if enabled + const Vector2& shadowOffset = mModel->GetShadowOffset(); + if ( fabsf( shadowOffset.x ) > Math::MACHINE_EPSILON_1 || fabsf( shadowOffset.y ) > Math::MACHINE_EPSILON_1 ) + { + // Create the image buffer for shadow + Devel::PixelBuffer shadowImageBuffer = CreateImageBuffer( bufferWidth, bufferHeight, Typesetter::STYLE_SHADOW, ignoreHorizontalAlignment, pixelFormat, penX, penY, 0u, numberOfGlyphs - 1 ); + + // Check whether it will be a soft shadow + const float& blurRadius = mModel->GetShadowBlurRadius(); + + if ( blurRadius > Math::MACHINE_EPSILON_1 ) + { + shadowImageBuffer.ApplyGaussianBlur( blurRadius ); + } + + // Combine the two buffers + imageBuffer = CombineImageBuffer( imageBuffer, shadowImageBuffer, bufferWidth, bufferHeight ); + } + + // Generate the underline if enabled + const bool underlineEnabled = mModel->IsUnderlineEnabled(); + if ( underlineEnabled ) + { + // Create the image buffer for underline + Devel::PixelBuffer underlineImageBuffer = CreateImageBuffer( bufferWidth, bufferHeight, Typesetter::STYLE_UNDERLINE, ignoreHorizontalAlignment, pixelFormat, penX, penY, 0u, numberOfGlyphs - 1 ); + + // Combine the two buffers + imageBuffer = CombineImageBuffer( imageBuffer, underlineImageBuffer, bufferWidth, bufferHeight ); + } + + // Generate the background if enabled + const bool backgroundEnabled = mModel->IsBackgroundEnabled(); + if ( backgroundEnabled ) + { + Devel::PixelBuffer backgroundImageBuffer = CreateImageBuffer( bufferWidth, bufferHeight, Typesetter::STYLE_BACKGROUND, ignoreHorizontalAlignment, pixelFormat, penX, penY, 0u, numberOfGlyphs -1 ); + + // Combine the two buffers + imageBuffer = CombineImageBuffer( imageBuffer, backgroundImageBuffer, bufferWidth, bufferHeight ); + } + } + + // Create the final PixelData for the combined image buffer + PixelData pixelData = Devel::PixelBuffer::Convert( imageBuffer ); + + return pixelData; +} + +Devel::PixelBuffer Typesetter::CreateImageBuffer( const unsigned int bufferWidth, const unsigned int bufferHeight, Typesetter::Style style, bool ignoreHorizontalAlignment, Pixel::Format pixelFormat, int horizontalOffset, int verticalOffset, GlyphIndex fromGlyphIndex, GlyphIndex toGlyphIndex ) +{ + // Retrieve lines, glyphs, positions and colors from the view model. + const Length modelNumberOfLines = mModel->GetNumberOfLines(); + const LineRun* const modelLinesBuffer = mModel->GetLines(); + const Length numberOfGlyphs = mModel->GetNumberOfGlyphs(); + const GlyphInfo* const glyphsBuffer = mModel->GetGlyphs(); + const Vector2* const positionBuffer = mModel->GetLayout(); + const Vector4* const colorsBuffer = mModel->GetColors(); + const ColorIndex* const colorIndexBuffer = mModel->GetColorIndices(); + + // Whether to use the default color. + const bool useDefaultColor = ( NULL == colorsBuffer ); + const Vector4& defaultColor = mModel->GetDefaultColor(); + + // Create and initialize the pixel buffer. + GlyphData glyphData; + glyphData.verticalOffset = verticalOffset; + glyphData.width = bufferWidth; + glyphData.height = bufferHeight; + glyphData.bitmapBuffer = Devel::PixelBuffer::New( bufferWidth, bufferHeight, pixelFormat ); + glyphData.horizontalOffset = 0; + + if ( Pixel::RGBA8888 == pixelFormat ) + { + const unsigned int bufferSizeInt = bufferWidth * bufferHeight; + const unsigned int bufferSizeChar = 4u * bufferSizeInt; + memset( glyphData.bitmapBuffer.GetBuffer(), 0u, bufferSizeChar ); + } + else + { + memset( glyphData.bitmapBuffer.GetBuffer(), 0, bufferWidth * bufferHeight ); + } + + // Get a handle of the font client. Used to retrieve the bitmaps of the glyphs. + TextAbstraction::FontClient fontClient = TextAbstraction::FontClient::Get(); + + // Traverses the lines of the text. + for( LineIndex lineIndex = 0u; lineIndex < modelNumberOfLines; ++lineIndex ) + { + const LineRun& line = *( modelLinesBuffer + lineIndex ); + + // Sets the horizontal offset of the line. + glyphData.horizontalOffset = ignoreHorizontalAlignment ? 0 : static_cast( line.alignmentOffset ); + glyphData.horizontalOffset += horizontalOffset; + + // Increases the vertical offset with the line's ascender. + glyphData.verticalOffset += static_cast( line.ascender ); + + // Include line spacing after first line + if( lineIndex > 0u ) + { + glyphData.verticalOffset += static_cast( line.lineSpacing ); + } + + // Retrieves the glyph's outline width + float outlineWidth = static_cast( mModel->GetOutlineWidth() ); + + if( style == Typesetter::STYLE_OUTLINE ) + { + glyphData.horizontalOffset -= outlineWidth; + if( lineIndex == 0u ) + { + // Only need to add the vertical outline offset for the first line + glyphData.verticalOffset -= outlineWidth; + } + } + else if ( style == Typesetter::STYLE_SHADOW ) + { + const Vector2& shadowOffset = mModel->GetShadowOffset(); + glyphData.horizontalOffset += shadowOffset.x - outlineWidth; // if outline enabled then shadow should offset from outline + + if ( lineIndex == 0u ) + { + // Only need to add the vertical shadow offset for first line + glyphData.verticalOffset += shadowOffset.y - outlineWidth; + } + } + + const bool underlineEnabled = mModel->IsUnderlineEnabled(); + const Vector4& underlineColor = mModel->GetUnderlineColor(); + const float underlineHeight = mModel->GetUnderlineHeight(); + + // Get the underline runs. + const Length numberOfUnderlineRuns = mModel->GetNumberOfUnderlineRuns(); + Vector underlineRuns; + underlineRuns.Resize( numberOfUnderlineRuns ); + mModel->GetUnderlineRuns( underlineRuns.Begin(), 0u, numberOfUnderlineRuns ); + + bool thereAreUnderlinedGlyphs = false; + + float currentUnderlinePosition = 0.0f; + float currentUnderlineThickness = underlineHeight; + float maxUnderlineThickness = currentUnderlineThickness; + + FontId lastUnderlinedFontId = 0; + + float lineExtentLeft = bufferWidth; + float lineExtentRight = 0.0f; + float baseline = 0.0f; + + // Traverses the glyphs of the line. + const GlyphIndex endGlyphIndex = std::min( numberOfGlyphs, line.glyphRun.glyphIndex + line.glyphRun.numberOfGlyphs ); + for( GlyphIndex glyphIndex = line.glyphRun.glyphIndex; glyphIndex < endGlyphIndex; ++glyphIndex ) + { + if ( glyphIndex < fromGlyphIndex || glyphIndex > toGlyphIndex ) + { + // Ignore any glyph that out of the specified range + continue; + } + + // Retrieve the glyph's info. + const GlyphInfo* const glyphInfo = glyphsBuffer + glyphIndex; + + if( ( glyphInfo->width < Math::MACHINE_EPSILON_1000 ) || + ( glyphInfo->height < Math::MACHINE_EPSILON_1000 ) ) + { + // Nothing to do if the glyph's width or height is zero. + continue; + } + + const bool underlineGlyph = underlineEnabled || IsGlyphUnderlined( glyphIndex, underlineRuns ); + thereAreUnderlinedGlyphs = thereAreUnderlinedGlyphs || underlineGlyph; + + // Are we still using the same fontId as previous + if( underlineGlyph && ( glyphInfo->fontId != lastUnderlinedFontId ) ) + { + // We need to fetch fresh font underline metrics + FetchFontUnderlineMetrics(fontClient, glyphInfo, currentUnderlinePosition, underlineHeight, currentUnderlineThickness, maxUnderlineThickness, lastUnderlinedFontId); + } // underline + + // Retrieves the glyph's position. + const Vector2* const position = positionBuffer + glyphIndex; + if ( baseline < position->y + glyphInfo->yBearing ) + { + baseline = position->y + glyphInfo->yBearing; + } + + // Calculate the positions of leftmost and rightmost glyphs in the current line + if ( position->x < lineExtentLeft) + { + lineExtentLeft = position->x; + } + + if ( position->x + glyphInfo->width > lineExtentRight) + { + lineExtentRight = position->x + glyphInfo->width; + } + + // Retrieves the glyph's color. + const ColorIndex colorIndex = useDefaultColor ? 0u : *( colorIndexBuffer + glyphIndex ); + + Vector4 color; + if ( style == Typesetter::STYLE_SHADOW ) + { + color = mModel->GetShadowColor(); + } + else if ( style == Typesetter::STYLE_OUTLINE ) + { + color = mModel->GetOutlineColor(); + } + else + { + color = ( useDefaultColor || ( 0u == colorIndex ) ) ? defaultColor : *( colorsBuffer + ( colorIndex - 1u ) ); + } + + // Premultiply alpha + color.r *= color.a; + color.g *= color.a; + color.b *= color.a; + + // Retrieves the glyph's bitmap. + glyphData.glyphBitmap.buffer = NULL; + glyphData.glyphBitmap.width = glyphInfo->width; // Desired width and height. + glyphData.glyphBitmap.height = glyphInfo->height; + + if( style != Typesetter::STYLE_OUTLINE && style != Typesetter::STYLE_SHADOW ) + { + // Don't render outline for other styles + outlineWidth = 0.0f; + } + + if( style != Typesetter::STYLE_UNDERLINE ) + { + fontClient.CreateBitmap( glyphInfo->fontId, + glyphInfo->index, + glyphInfo->isItalicRequired, + glyphInfo->isBoldRequired, + glyphData.glyphBitmap, + static_cast( outlineWidth ) ); + } + + // Sets the glyph's bitmap into the bitmap of the whole text. + if( NULL != glyphData.glyphBitmap.buffer ) + { + if ( style == Typesetter::STYLE_OUTLINE ) + { + // Set the position offset for the current glyph + glyphData.horizontalOffset -= glyphData.glyphBitmap.outlineOffsetX; + glyphData.verticalOffset -= glyphData.glyphBitmap.outlineOffsetY; + } + + // Set the buffer of the glyph's bitmap into the final bitmap's buffer + TypesetGlyph( glyphData, + position, + &color, + style, + pixelFormat); + + if ( style == Typesetter::STYLE_OUTLINE ) + { + // Reset the position offset for the next glyph + glyphData.horizontalOffset += glyphData.glyphBitmap.outlineOffsetX; + glyphData.verticalOffset += glyphData.glyphBitmap.outlineOffsetY; + } + + // delete the glyphBitmap.buffer as it is now copied into glyphData.bitmapBuffer + delete []glyphData.glyphBitmap.buffer; + glyphData.glyphBitmap.buffer = NULL; + } + } + + // Draw the underline from the leftmost glyph to the rightmost glyph + if ( thereAreUnderlinedGlyphs && style == Typesetter::STYLE_UNDERLINE ) + { + DrawUnderline(underlineColor, bufferWidth, bufferHeight, glyphData, baseline, currentUnderlinePosition, maxUnderlineThickness, lineExtentLeft, lineExtentRight); + } + + // Draw the background color from the leftmost glyph to the rightmost glyph + if ( style == Typesetter::STYLE_BACKGROUND ) + { + DrawBackgroundColor(mModel->GetBackgroundColor(), bufferWidth, bufferHeight, glyphData, baseline, line, lineExtentLeft, lineExtentRight); + } + + // Increases the vertical offset with the line's descender. + glyphData.verticalOffset += static_cast( -line.descender ); + } + + return glyphData.bitmapBuffer; +} + +Devel::PixelBuffer Typesetter::CombineImageBuffer( Devel::PixelBuffer topPixelBuffer, Devel::PixelBuffer bottomPixelBuffer, const unsigned int bufferWidth, const unsigned int bufferHeight ) +{ + unsigned char* topBuffer = topPixelBuffer.GetBuffer(); + unsigned char* bottomBuffer = bottomPixelBuffer.GetBuffer(); + + Devel::PixelBuffer combinedPixelBuffer; + + if ( topBuffer == NULL && bottomBuffer == NULL ) + { + // Nothing to do if both buffers are empty. + return combinedPixelBuffer; + } + + if ( topBuffer == NULL ) + { + // Nothing to do if topBuffer is empty. + return bottomPixelBuffer; + } + + if ( bottomBuffer == NULL ) + { + // Nothing to do if bottomBuffer is empty. + return topPixelBuffer; + } + + // Always combine two RGBA images + const unsigned int bufferSizeInt = bufferWidth * bufferHeight; + const unsigned int bufferSizeChar = 4u * bufferSizeInt; + + combinedPixelBuffer = Devel::PixelBuffer::New( bufferWidth, bufferHeight, Pixel::RGBA8888 ); + uint8_t* combinedBuffer = reinterpret_cast< uint8_t* >( combinedPixelBuffer.GetBuffer() ); + memset( combinedBuffer, 0u, bufferSizeChar ); + + for (unsigned int pixelIndex = 0; pixelIndex < bufferSizeInt; pixelIndex++) + { + // If the alpha of the pixel in either buffer is not fully opaque, blend the two pixels. + // Otherwise, copy pixel from topBuffer to combinedBuffer. + + unsigned int alphaBuffer1 = topBuffer[pixelIndex*4+3]; + + if ( alphaBuffer1 != 255 ) + { + // At least one pixel is not fully opaque + // "Over" blend the the pixel from topBuffer with the pixel in bottomBuffer + combinedBuffer[pixelIndex*4] = topBuffer[pixelIndex*4] + ( bottomBuffer[pixelIndex*4] * ( 255 - topBuffer[pixelIndex*4+3] ) / 255 ); + combinedBuffer[pixelIndex*4+1] = topBuffer[pixelIndex*4+1] + ( bottomBuffer[pixelIndex*4+1] * ( 255 - topBuffer[pixelIndex*4+3] ) / 255 ); + combinedBuffer[pixelIndex*4+2] = topBuffer[pixelIndex*4+2] + ( bottomBuffer[pixelIndex*4+2] * ( 255 - topBuffer[pixelIndex*4+3] ) / 255 ); + combinedBuffer[pixelIndex*4+3] = topBuffer[pixelIndex*4+3] + ( bottomBuffer[pixelIndex*4+3] * ( 255 - topBuffer[pixelIndex*4+3] ) / 255 ); + } + else + { + // Copy the pixel from topBuffer to combinedBuffer + combinedBuffer[pixelIndex*4] = topBuffer[pixelIndex*4]; + combinedBuffer[pixelIndex*4+1] = topBuffer[pixelIndex*4+1]; + combinedBuffer[pixelIndex*4+2] = topBuffer[pixelIndex*4+2]; + combinedBuffer[pixelIndex*4+3] = topBuffer[pixelIndex*4+3]; + } + } + + return combinedPixelBuffer; +} + Typesetter::Typesetter( const ModelInterface* const model ) : mModel( new ViewModel( model ) ) {