2 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <dali/internal/text/text-abstraction/cairo-renderer.h>
22 #include <dali/public-api/common/constants.h>
29 #include FT_FREETYPE_H
35 #include <dali/devel-api/text-abstraction/font-client.h>
36 #include <dali/devel-api/text-abstraction/text-renderer-layout-helper.h>
37 #include <dali/integration-api/debug.h>
38 #include <dali/internal/imaging/common/image-operations.h>
39 #include <dali/internal/text/text-abstraction/font-client-impl.h>
46 const float TO_FLOAT = 1.f / 255.f;
47 const float TO_UCHAR = 255.f;
48 const float TWO_PI = 2.f * Dali::Math::PI; ///< 360 degrees in radians
51 * @brief Run of glyphs that have the same style.
56 : fontFace{ nullptr },
62 isItalicRequired{ false },
63 isBoldRequired{ false }
66 FT_Face fontFace; ///< The font face used by the glyphs in the run.
67 double fontSize; ///< The font size used by the glyphs in the run. According the Cairo's documentation this is in user space units. It works if I set the size in pixels.
68 unsigned int glyphIndex; ///< Index to the first glyph of the run.
69 unsigned int numberOfGlyphs; ///< Number of glyphs in the run.
70 unsigned int fontId; ///< The id of the font.
71 unsigned int colorIndex; ///< The index to the color of the glyphs.
72 bool isItalicRequired:1; ///< Whether the italic style is required.
73 bool isBoldRequired:1; ///< Whether the bold style is required.
77 * @brief Helper struct used to destroy a bitmap buffer.
79 * The font client allocates a bitmap's buffer with the new operator.
80 * However, the PixelBuffer class allocates the buffer with the
81 * malloc() function and the Rotate() function which is intended
82 * for the PixelBuffer as well allocates memory with malloc().
84 * This struct keeps the type of allocation and uses the delete[]
85 * operator or the free() function to deallocate resources.
95 GlyphBuffer( Dali::TextAbstraction::FontClient::GlyphBufferData& data, DestructorType type )
112 delete[] data.buffer;
117 Dali::TextAbstraction::FontClient::GlyphBufferData& data;
122 * @brief Creates a pixel buffer with all pixels set to transparent.
124 * @param[in] parameters Contains the width and height of the pixel buffer.
126 * @return The pixel buffer.
128 Dali::Devel::PixelBuffer CreateVoidPixelBuffer( const Dali::TextAbstraction::TextRenderer::Parameters& parameters )
130 Dali::Pixel::Format pixelFormat = parameters.pixelFormat == Dali::TextAbstraction::TextRenderer::Parameters::A8 ? Dali::Pixel::A8 : Dali::Pixel::RGBA8888;
131 Dali::Devel::PixelBuffer pixelBuffer = Dali::Devel::PixelBuffer::New( parameters.width,
135 const unsigned int bufferSize = parameters.width * parameters.height * Dali::Pixel::GetBytesPerPixel( pixelFormat );
136 unsigned char* buffer = pixelBuffer.GetBuffer();
137 memset( buffer, 0, bufferSize );
143 * @brief Wraps the vertices of glyphs laid out on a horizontal strainght line on a circular path.
145 * It copies the vertices from the extra cairo context created to lay out the text
146 * on a horizontal straight line to the cairo context used to render it.
148 * @param[in,out] cr The cairo context used to render the text.
149 * @param[in] circularCr The extra cairo context created to layout horizontal text.
150 * @param[in] parameters The parameters of the circular path.
152 void WrapToCircularPath( cairo_t* cr, cairo_t* circularCr, const Dali::TextAbstraction::CircularTextParameters& parameters )
156 // Copy the path to get a cairo_path_t pointer used to iterate through all its items.
157 std::unique_ptr<cairo_path_t, void(*)(cairo_path_t*)> path( cairo_copy_path( circularCr ), cairo_path_destroy );
159 // Iterates through all the path items and transform each vertex to follow the circle.
160 // Transformed vertices are added to a new path in the 'cr' context (the one used to render the circular text)
161 for( int i = 0; i < path->num_data; i += path->data[i].header.length )
163 cairo_path_data_t* data = &path->data[i];
165 switch( data->header.type )
167 case CAIRO_PATH_MOVE_TO:
171 cairo_new_path( cr );
175 double x = data[1].point.x;
176 double y = data[1].point.y;
177 Dali::TextAbstraction::TransformToArc( parameters, x, y );
178 cairo_move_to( cr, x, y );
181 case CAIRO_PATH_LINE_TO:
183 double x = data[1].point.x;
184 double y = data[1].point.y;
185 Dali::TextAbstraction::TransformToArc( parameters, x, y );
186 cairo_line_to( cr, x, y );
189 case CAIRO_PATH_CURVE_TO:
191 double x1 = data[1].point.x;
192 double y1 = data[1].point.y;
193 double x2 = data[2].point.x;
194 double y2 = data[2].point.y;
195 double x3 = data[3].point.x;
196 double y3 = data[3].point.y;
197 Dali::TextAbstraction::TransformToArc( parameters, x1, y1 );
198 Dali::TextAbstraction::TransformToArc( parameters, x2, y2 );
199 Dali::TextAbstraction::TransformToArc( parameters, x3, y3 );
200 cairo_curve_to( cr, x1, y1, x2, y2, x3, y3 );
203 case CAIRO_PATH_CLOSE_PATH:
205 cairo_close_path( cr );
210 DALI_LOG_WARNING( "Type of path not handled.\n" );
211 // Nothing else to do.
223 namespace TextAbstraction
229 Devel::PixelBuffer RenderTextCairo( const TextAbstraction::TextRenderer::Parameters& parameters )
231 const unsigned int numberOfGlyphs = parameters.glyphs.Count();
233 if( 0u == numberOfGlyphs )
235 // return a pixel buffer with all pixels set to transparent.
236 return CreateVoidPixelBuffer( parameters );
239 // Choose the pixel format to be used.
241 // @note Behdad wrote "Upper 8 bits maps to the fourth byte in a little-endian machine like the intels."
242 // https://lists.cairographics.org/archives/cairo/2006-March/006563.html
244 // Here in practice Cairo's ARGB32 is like DALi's RGBA8888.
246 const bool isDstRgba = TextAbstraction::TextRenderer::Parameters::RGBA8888 == parameters.pixelFormat;
247 const Pixel::Format pixelFormat = isDstRgba ? Pixel::Format::RGBA8888 : Pixel::Format::A8;
248 const cairo_format_t cairoFormat = isDstRgba ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_A8;
250 const int bpp = Pixel::GetBytesPerPixel( pixelFormat );
253 // return a pixel buffer with all pixels set to transparent.
254 return CreateVoidPixelBuffer( parameters );
257 // This function provides a stride value that will respect all alignment requirements of the
258 // accelerated image-rendering code within cairo.
259 const int stride = cairo_format_stride_for_width( cairoFormat,
260 static_cast<int>( parameters.width ) );
261 const int strideWidth = stride / bpp;
263 // Convert from DALi glyphs to Cairo glyphs.
264 std::vector<cairo_glyph_t> cairoGlyphs;
265 cairoGlyphs.resize( numberOfGlyphs );
266 cairo_glyph_t* cairoGlyphsBuffer = &cairoGlyphs[0u];
268 const GlyphInfo* const daliGlyphsBuffer = parameters.glyphs.Begin();
269 const Vector2* const positionsBuffer = parameters.positions.Begin();
270 const ColorIndex* const colorIndicesBuffer = ( 0u == parameters.colorIndices.Count() ) ? nullptr : parameters.colorIndices.Begin();
272 for( unsigned index = 0u; index < numberOfGlyphs; ++index )
274 const GlyphInfo& daliGlyph = *( daliGlyphsBuffer + index );
275 const Vector2& position = *( positionsBuffer + index );
276 cairo_glyph_t& cairoGlyph = *( cairoGlyphsBuffer + index );
278 cairoGlyph.index = daliGlyph.index;
279 cairoGlyph.x = round( position.x );
280 cairoGlyph.y = round( position.y );
283 // Retrieve the FreeType fonts needed by Cairo from the font-client.
284 Dali::TextAbstraction::FontClient fontClient = Dali::TextAbstraction::FontClient::Get();
286 FT_Library ftLibrary;
287 auto error = FT_Init_FreeType( &ftLibrary );
290 DALI_LOG_ERROR( "Error initializing FT library\n" );
292 // return a pixel buffer with all pixels set to transparent.
293 return CreateVoidPixelBuffer( parameters );
296 // Vector used to store the FreeType font faces, its size and the run of glyphs that use the font.
297 std::vector<GlyphRun> glyphRuns;
298 glyphRuns.reserve( 8u );
300 // The size set in Cairo and FreeType has different units.
301 // Before the size is set in Cairo it needs to be converted according the formula
302 // 'pixel_size = point_size * resolution / 72' got from the FreeType doc.
303 // https://www.freetype.org/freetype2/docs/glyphs/glyphs-2.html
305 unsigned int horizontalDpi = 0u;
306 unsigned int verticalDpi = 0u;
307 fontClient.GetDpi( horizontalDpi, verticalDpi );
308 const double dVerticalDpi = static_cast<double>( verticalDpi );
310 const double FROM_26_DOT_6_TO_PIXELS = dVerticalDpi / ( 64.0 * 72.0 );
312 GlyphRun currentGlyphRun;
313 currentGlyphRun.fontId = 0u;
314 currentGlyphRun.colorIndex = 0u;
315 currentGlyphRun.isItalicRequired = false;
316 currentGlyphRun.isBoldRequired = false;
317 for( unsigned index = 0u; index < numberOfGlyphs; ++index )
319 const GlyphInfo& daliGlyph = *( daliGlyphsBuffer + index );
320 const FontId fontId = daliGlyph.fontId;
321 const ColorIndex colorIndex = ( nullptr == colorIndicesBuffer ) ? 0u : *( colorIndicesBuffer + index );
322 const bool isItalicRequired = daliGlyph.isItalicRequired;
323 const bool isBoldRequired = daliGlyph.isBoldRequired;
325 if( ( fontId != currentGlyphRun.fontId ) ||
326 ( ( 0u == fontId ) && ( 0u != daliGlyph.index ) ) ||
327 ( colorIndex != currentGlyphRun.colorIndex ) ||
328 ( isItalicRequired != currentGlyphRun.isItalicRequired ) ||
329 ( isBoldRequired != currentGlyphRun.isBoldRequired ) )
331 // There is a new run. First set the number of glyphs of the previous run and store it.
332 currentGlyphRun.numberOfGlyphs = index - currentGlyphRun.glyphIndex;
333 if( 0u != currentGlyphRun.numberOfGlyphs )
335 glyphRuns.push_back( currentGlyphRun );
338 currentGlyphRun.fontFace = nullptr;
339 currentGlyphRun.fontSize = 0.0;
340 currentGlyphRun.glyphIndex = index;
341 currentGlyphRun.numberOfGlyphs = 0u;
342 currentGlyphRun.fontId = 0u;
343 currentGlyphRun.colorIndex = 0u;
344 currentGlyphRun.isItalicRequired = false;
345 currentGlyphRun.isBoldRequired = false;
349 // Get the font's path file name from the font Id.
350 FontDescription fontDescription;
351 fontClient.GetDescription( fontId, fontDescription );
353 switch( fontDescription.type )
355 case FontDescription::FACE_FONT:
357 // Create a FreeType font's face.
358 auto error = FT_New_Face( ftLibrary, fontDescription.path.c_str(), 0u, ¤tGlyphRun.fontFace );
361 DALI_LOG_ERROR( "Error in FT while creating a new face\n" );
363 // return a pixel buffer with all pixels set to transparent.
364 return CreateVoidPixelBuffer( parameters );
367 // Set the font's size. It needs to be set in the Freetype font and in the Cairo's context.
368 unsigned int fontSize = fontClient.GetPointSize( fontId );
370 // Font's size to be set in the Cairo's context.
371 currentGlyphRun.fontSize = FROM_26_DOT_6_TO_PIXELS * static_cast<double>( fontSize );
374 case FontDescription::BITMAP_FONT:
386 currentGlyphRun.fontId = fontId;
387 currentGlyphRun.colorIndex = colorIndex;
388 currentGlyphRun.isItalicRequired = isItalicRequired;
389 currentGlyphRun.isBoldRequired = isBoldRequired;
393 // Calculate the number of glyphs of the last run and store it.
394 currentGlyphRun.numberOfGlyphs = numberOfGlyphs - currentGlyphRun.glyphIndex;
395 if( 0u != currentGlyphRun.numberOfGlyphs )
397 glyphRuns.push_back( currentGlyphRun );
400 // Creates the pixel buffer and retrieves the buffer pointer used to create the Cairo's surface.
401 Devel::PixelBuffer pixelBuffer = Devel::PixelBuffer::New( strideWidth, parameters.height, pixelFormat );
403 unsigned char* buffer = pixelBuffer.GetBuffer();
404 const unsigned int bufferSize = stride * parameters.height;
405 memset( buffer, 0, bufferSize );
407 std::unique_ptr<cairo_surface_t, void(*)(cairo_surface_t*)> surfacePtr( cairo_image_surface_create_for_data( buffer,
412 cairo_surface_destroy );
413 cairo_surface_t* surface = surfacePtr.get();
415 if( ( nullptr == surface ) || ( CAIRO_STATUS_SUCCESS != cairo_surface_status( surface ) ) )
417 DALI_LOG_ERROR( "Failed to create a cairo's surface\n" );
419 return CreateVoidPixelBuffer( parameters );
422 // Whether the text is circular.
423 const bool isCircularText = 0u != parameters.radius;
425 // Creates a surface for circular text.
427 // The reason to create a surface for circular text is that the strategy
428 // followed is to layout the text in a straight horizontal line and apply a
429 // transform to each vertex that forms the geometry of the glyphs to place
430 // and bend the glyphs accordingly to the circular path.
432 // As the glyphs are laid out first in a straight line they may exceed the
433 // boundaries of the surface in that case cairo ignores them.
434 std::unique_ptr<cairo_surface_t, void(*)(cairo_surface_t*)> circularSurfacePtr( nullptr, cairo_surface_destroy );
435 cairo_surface_t* circularSurface = nullptr;
438 circularSurfacePtr.reset( cairo_surface_create_similar( surface,
440 parameters.circularWidth,
441 parameters.circularHeight ) );
442 circularSurface = circularSurfacePtr.get();
444 if( ( nullptr == circularSurface ) || ( CAIRO_STATUS_SUCCESS != cairo_surface_status( circularSurface ) ) )
446 DALI_LOG_ERROR( "Failed to create a cairo's circular surface\n" );
448 return CreateVoidPixelBuffer( parameters );
452 std::unique_ptr<cairo_t, void(*)(cairo_t*)> crPtr( cairo_create( surface ), cairo_destroy );
453 cairo_t* cr = crPtr.get();
455 if( CAIRO_STATUS_SUCCESS != cairo_status( cr ) )
457 DALI_LOG_ERROR( "Failed to create a cairo context\n" );
459 return CreateVoidPixelBuffer( parameters );
462 std::unique_ptr<cairo_t, void(*)(cairo_t*)> circularCrPtr( nullptr, cairo_destroy );
463 cairo_t* circularCr = nullptr;
467 circularCrPtr.reset( cairo_create( circularSurface ) );
468 circularCr = circularCrPtr.get();
470 if( CAIRO_STATUS_SUCCESS != cairo_status( circularCr ) )
472 DALI_LOG_ERROR( "Failed to create a cairo context\n" );
474 return CreateVoidPixelBuffer( parameters );
478 CircularTextParameters circularTextParameters;
480 // Render the glyphs.
483 // Set the parameters.
484 circularTextParameters.isClockwise = ( TextAbstraction::TextRenderer::Parameters::CLOCKWISE == parameters.circularLayout );
486 circularTextParameters.centerX = static_cast<double>( parameters.centerX );
487 circularTextParameters.centerY = static_cast<double>( parameters.centerY );
488 circularTextParameters.radius = static_cast<double>( parameters.radius );
489 circularTextParameters.invRadius = 1.0 / circularTextParameters.radius;
490 circularTextParameters.beginAngle = -parameters.beginAngle + Dali::Math::PI_2;
493 cairo_move_to( cr, 0.0, 0.0 );
495 for( const auto& run: glyphRuns )
497 const bool isEmoji = parameters.isEmoji[run.glyphIndex];
498 if( isEmoji || ( nullptr == run.fontFace ) )
500 // Retrieve the color for the glyph.
501 const Vector4& color = parameters.colors[run.colorIndex];
503 const unsigned int lastGlyphIndex = run.glyphIndex + run.numberOfGlyphs;
504 for( unsigned int index = run.glyphIndex; index < lastGlyphIndex; ++index )
506 // Whether it's a bitmap font.
507 const bool doBlendWithTextColor = !isEmoji && ( ColorBlendingMode::MULTIPLY == parameters.blendingMode[index] );
509 // Check if there is an embedded image or a bitmap font image.
510 const GlyphIndex glyphFontIndex = daliGlyphsBuffer[index].index;
511 if( 0u != glyphFontIndex )
513 // The embedded image could be A8, RGBA8888 or BGRA8888.
515 // If the embedded image is RGBA8888 or BGRA8888 then the cairo's buffer is ARGB32. It's needed to convert from RGBA or BGRA to ARGB.
516 // If the embedded image is A8 it's needed to check if the cairo's buffer is A8 or ARGB32 and do the conversion if needed.
518 const cairo_glyph_t& glyph = *( cairoGlyphsBuffer + index );
520 // Retrieve the image
521 TextAbstraction::FontClient::GlyphBufferData data;
522 std::unique_ptr<GlyphBuffer> glyphBufferPtr( new GlyphBuffer( data, GlyphBuffer::DELETE ) );
525 data.width = parameters.glyphs[run.glyphIndex].width;
526 data.height = parameters.glyphs[run.glyphIndex].height;
529 fontClient.CreateBitmap( run.fontId, glyphFontIndex, false, false, data, 0u );
531 if( nullptr == data.buffer )
533 // nothing else to do if there is no image.
537 // Calculate the position for the circular text.
538 double glyphX = glyph.x;
539 double glyphY = glyph.y;
543 // Center of the bitmap.
544 const double halfWidth = 0.5 * static_cast<double>( data.width );
545 const double halfHeight = 0.5 * static_cast<double>( data.height );
547 double centerX = glyph.x + halfWidth;
548 double centerY = glyph.y - halfHeight;
550 float radians = circularTextParameters.beginAngle + ( circularTextParameters.isClockwise ? -1.f : 1.f ) * ( Dali::Math::PI_2 + circularTextParameters.invRadius * centerX );
551 radians = fmod( radians, TWO_PI );
552 radians += ( radians < 0.f ) ? TWO_PI : 0.f;
554 TransformToArc( circularTextParameters, centerX, centerY );
556 uint8_t* pixelsOut = nullptr;
557 unsigned int widthOut = data.width;
558 unsigned int heightOut = data.height;
559 const unsigned int pixelSize = Pixel::GetBytesPerPixel( data.format );
561 Dali::Internal::Platform::RotateByShear( data.buffer,
569 if( nullptr != pixelsOut )
571 delete[] data.buffer;
572 data.buffer = pixelsOut;
573 glyphBufferPtr.get()->type = GlyphBuffer::FREE;
574 data.width = widthOut;
575 data.height = heightOut;
578 glyphX = centerX - 0.5 * static_cast<double>( data.width );
579 glyphY = centerY + 0.5 * static_cast<double>( data.height );
583 if( ( Pixel::A8 != data.format ) &&
584 ( Pixel::L8 != data.format ) &&
585 ( Pixel::RGBA8888 != data.format ) &&
586 ( Pixel::BGRA8888 != data.format ) )
588 DALI_LOG_ERROR( " Cairo Renderer: The valid pixel format for embedded items are A8 or RGBA8888\n" );
592 // Check if the item is out of the buffer.
593 if( ( glyphX + static_cast<float>( data.width ) < 0.f ) ||
594 ( glyphX > static_cast<float>( strideWidth ) ) ||
596 ( glyphY - static_cast<float>( data.height ) > static_cast<float>( parameters.height ) ) )
598 // The embedded item is completely out of the buffer.
602 const bool isSrcA = ( Pixel::A8 == data.format ) || ( Pixel::L8 == data.format );
603 const bool isSrcRgba = Pixel::RGBA8888 == data.format;
604 const bool isSrcBgra = Pixel::BGRA8888 == data.format;
606 // 0 -> image and cairo buffer are A8
607 // 1 -> image is A8, cairo buffer is ARGB
608 // 2 -> image is RGBA and cairo buffer is ARGB
609 // 3 -> image is BGRA and cairo buffer is ARGB
611 if( isSrcA && isDstRgba )
615 else if( isSrcRgba && isDstRgba )
619 else if( isSrcBgra && isDstRgba )
623 else if( ( isSrcRgba || isSrcBgra ) && !isDstRgba )
625 DALI_LOG_ERROR( "Cairo Renderer: The embedded image is RGBA or BGRA and the Cairo's buffer has been creates with A8 format!\n" );
629 // Select the cropped source image area to copy into the surface buffer
630 unsigned int glyphUintX = 0u;
631 unsigned int glyphUintY = 0u;
632 unsigned int srcWidth = data.width;
633 unsigned int srcHeight = data.height;
634 unsigned int xSrcIndex = 0u;
635 unsigned int ySrcIndex = 0u;
638 xSrcIndex = static_cast<unsigned int>( abs( glyphX ) );
639 srcWidth -= xSrcIndex;
643 glyphUintX = static_cast<unsigned int>( glyphX );
646 if( glyphUintX + srcWidth > static_cast<unsigned int>( strideWidth ) )
648 srcWidth -= ( ( glyphUintX + srcWidth ) - strideWidth );
651 if( glyphY - static_cast<float>( srcHeight ) < 0.f )
653 ySrcIndex = static_cast<unsigned int>( abs( glyphY - static_cast<float>( srcHeight ) ) );
654 srcHeight -= ySrcIndex;
658 glyphUintY = static_cast<unsigned int>( glyphY - static_cast<float>( srcHeight ) );
661 if( glyphUintY + srcHeight > parameters.height )
663 srcHeight -= ( ( glyphUintY + srcHeight ) - parameters.height );
666 // Calculate the source and destination indices.
667 const unsigned int srcPixelSize = Pixel::GetBytesPerPixel( data.format );
668 const unsigned int dstPixelSize = Pixel::GetBytesPerPixel( pixelFormat );
670 unsigned int srcIndex = srcPixelSize * ( ySrcIndex * srcWidth + xSrcIndex );
671 unsigned int dstIndex = dstPixelSize * ( glyphUintY * strideWidth + glyphUintX );
673 const unsigned int srcWidthOffset = srcPixelSize * ( data.width - srcWidth );
674 const unsigned int dstWidthOffset = dstPixelSize * ( strideWidth - srcWidth );
676 // Copy the image to the surface
677 for( unsigned int j = 0; j < srcHeight; ++j )
679 for( unsigned int i = 0; i < srcWidth; ++i )
683 case 0: // Both the image's buffer and cairo's buffer are A8
685 const unsigned char alpha = *( data.buffer + srcIndex );
688 // @todo needs a proper blending!
689 *( buffer + dstIndex ) = alpha;
693 case 1: // The image's buffer is A8 and the cairo's buffer is ARGB
695 const unsigned char alpha = *( data.buffer + srcIndex );
698 // @todo needs a proper blending!
699 const float srcAlpha = TO_FLOAT * static_cast<float>( alpha );
701 // Write the RGBA modulated with the given default color.
702 const float* const colorPtr = color.AsFloat();
703 *( buffer + dstIndex + 0u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[0u] * srcAlpha );
704 *( buffer + dstIndex + 1u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[1u] * srcAlpha );
705 *( buffer + dstIndex + 2u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[2u] * srcAlpha );
706 *( buffer + dstIndex + 3u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[3u] * srcAlpha );
710 case 2: // The image's buffer is RGBA and the cairo's buffer is ARGB
712 const unsigned char alpha = *(data.buffer + srcIndex + 3u);
715 if( doBlendWithTextColor )
717 const float* const colorPtr = color.AsFloat();
719 const float srcAlpha = TO_FLOAT * static_cast<float>(alpha) * colorPtr[3u];
721 *(buffer + dstIndex + 0u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 0u) ) * colorPtr[0u] );
722 *(buffer + dstIndex + 1u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 1u) ) * colorPtr[1u] );
723 *(buffer + dstIndex + 2u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 2u) ) * colorPtr[2u] );
726 *(buffer + dstIndex + 3u) = static_cast<unsigned char>( TO_UCHAR * srcAlpha );
730 // @todo needs a proper blending!
732 *(buffer + dstIndex + 0u) = *(data.buffer + srcIndex + 0u);
733 *(buffer + dstIndex + 1u) = *(data.buffer + srcIndex + 1u);
734 *(buffer + dstIndex + 2u) = *(data.buffer + srcIndex + 2u);
737 *(buffer + dstIndex + 3u) = *(data.buffer + srcIndex + 3u);
742 case 3: // The image's buffer is BGRA and the cairo's buffer is ARGB
744 const unsigned char alpha = *(data.buffer + srcIndex + 3u);
747 if( doBlendWithTextColor )
749 const float* const colorPtr = color.AsFloat();
751 const float srcAlpha = TO_FLOAT * static_cast<float>(alpha) * colorPtr[3u];
753 *(buffer + dstIndex + 0u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 2u) ) * colorPtr[0u] );
754 *(buffer + dstIndex + 1u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 1u) ) * colorPtr[1u] );
755 *(buffer + dstIndex + 2u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 0u) ) * colorPtr[2u] );
758 *(buffer + dstIndex + 3u) = static_cast<unsigned char>( TO_UCHAR * srcAlpha );
762 // @todo needs a proper blending!
764 *(buffer + dstIndex + 0u) = *(data.buffer + srcIndex + 2u);
765 *(buffer + dstIndex + 1u) = *(data.buffer + srcIndex + 1u);
766 *(buffer + dstIndex + 2u) = *(data.buffer + srcIndex + 0u);
767 *(buffer + dstIndex + 3u) = *(data.buffer + srcIndex + 3u);
774 DALI_ASSERT_ALWAYS( !"Cairo Renderer: The accepted values for this switch case are: 0, 1, 2!" );
777 srcIndex += srcPixelSize;
778 dstIndex += dstPixelSize;
780 srcIndex += srcWidthOffset;
781 dstIndex += dstWidthOffset;
788 // Sets the color. The color is actually BGRA
789 const Vector4& color = parameters.colors[run.colorIndex];
791 cairo_set_source_rgba( cr,
792 static_cast<double>( color.b ),
793 static_cast<double>( color.g ),
794 static_cast<double>( color.r ),
795 static_cast<double>( color.a ) );
797 // Create the Cairo's font from the FreeType font.
799 options = CAIRO_HINT_STYLE_SLIGHT;
800 std::unique_ptr<cairo_font_face_t, void(*)(cairo_font_face_t*)> fontFacePtr( cairo_ft_font_face_create_for_ft_face( run.fontFace, options ), cairo_font_face_destroy );
801 cairo_font_face_t* fontFace = fontFacePtr.get();
803 static const cairo_user_data_key_t key = { 0 };
804 cairo_status_t status = cairo_font_face_set_user_data( fontFace, &key, run.fontFace, reinterpret_cast<cairo_destroy_func_t>( FT_Done_Face ) );
807 cairo_font_face_destroy( fontFace );
810 unsigned int ftSynthesizeFlag = 0u;
811 if( run.isBoldRequired && !( run.fontFace->style_flags & FT_STYLE_FLAG_BOLD ) )
813 ftSynthesizeFlag |= CAIRO_FT_SYNTHESIZE_BOLD;
816 cairo_ft_font_face_set_synthesize( fontFace, ftSynthesizeFlag );
818 cairo_font_face_reference( fontFace );
820 const bool synthesizeItalic = ( run.isItalicRequired && !( run.fontFace->style_flags & FT_STYLE_FLAG_ITALIC ) );
822 if( CAIRO_STATUS_SUCCESS != cairo_font_face_status( fontFace ) )
824 DALI_LOG_ERROR( "Failed to load the Freetype Font\n" );
828 cairo_set_font_face( isCircularText ? circularCr : cr, fontFace );
831 cairo_set_font_size( isCircularText ? circularCr : cr, run.fontSize );
833 // Render the glyphs.
836 circularTextParameters.synthesizeItalic = synthesizeItalic;
838 const unsigned int glyphJump = circularTextParameters.synthesizeItalic ? 1u : run.numberOfGlyphs;
840 for( unsigned int index = 0u; index < run.numberOfGlyphs; index += glyphJump )
842 // Clears the current path where the text is laid out on a horizontal straight line.
843 cairo_new_path( circularCr );
844 cairo_move_to( circularCr, 0.0, 0.0 );
846 cairo_glyph_path( circularCr, ( cairoGlyphsBuffer + run.glyphIndex + index ), glyphJump );
848 WrapToCircularPath( cr, circularCr, circularTextParameters );
854 if( synthesizeItalic )
856 // Apply a shear transform to synthesize the italics.
857 // For a reason Cairo may trim some glyphs if the CAIRO_FT_SYNTHESIZE_OBLIQUE flag is used.
859 // This is to calculate an offset used to compensate the 'translation' done by the shear transform
860 // as it's done for the whole render buffer.
862 for( unsigned int index = run.glyphIndex, endIndex = run.glyphIndex + run.numberOfGlyphs; index < endIndex; ++index )
864 maxY = std::max( maxY, (*( cairoGlyphsBuffer + index )).y );
867 cairo_matrix_t matrix;
868 cairo_matrix_init( &matrix,
870 -TextAbstraction::FontClient::DEFAULT_ITALIC_ANGLE, 1.0,
871 maxY * TextAbstraction::FontClient::DEFAULT_ITALIC_ANGLE, 0.0 );
873 cairo_transform( cr, &matrix );
876 cairo_show_glyphs( cr, ( cairoGlyphsBuffer + run.glyphIndex ), run.numberOfGlyphs );
878 if( synthesizeItalic )
880 // Restore the transform matrix to the identity.
881 cairo_matrix_t matrix;
882 cairo_matrix_init_identity( &matrix );
883 cairo_set_matrix( cr, &matrix );
894 } // namespace Internal
896 } // namespace TextAbstraction