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>
44 const float TO_FLOAT = 1.f / 255.f;
45 const float TO_UCHAR = 255.f;
46 const float TWO_PI = 2.f * Dali::Math::PI; ///< 360 degrees in radians
49 * @brief Run of glyphs that have the same style.
54 : fontFace{ nullptr },
60 isItalicRequired{ false },
61 isBoldRequired{ false }
64 FT_Face fontFace; ///< The font face used by the glyphs in the run.
65 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.
66 unsigned int glyphIndex; ///< Index to the first glyph of the run.
67 unsigned int numberOfGlyphs; ///< Number of glyphs in the run.
68 unsigned int fontId; ///< The id of the font.
69 unsigned int colorIndex; ///< The index to the color of the glyphs.
70 bool isItalicRequired:1; ///< Whether the italic style is required.
71 bool isBoldRequired:1; ///< Whether the bold style is required.
75 * @brief Helper struct used to destroy a bitmap buffer.
77 * The font client allocates a bitmap's buffer with the new operator.
78 * However, the PixelBuffer class allocates the buffer with the
79 * malloc() function and the Rotate() function which is intended
80 * for the PixelBuffer as well allocates memory with malloc().
82 * This struct keeps the type of allocation and uses the delete[]
83 * operator or the free() function to deallocate resources.
93 GlyphBuffer( Dali::TextAbstraction::FontClient::GlyphBufferData& data, DestructorType type )
110 delete[] data.buffer;
115 Dali::TextAbstraction::FontClient::GlyphBufferData& data;
120 * @brief Creates a pixel buffer with all pixels set to transparent.
122 * @param[in] parameters Contains the width and height of the pixel buffer.
124 * @return The pixel buffer.
126 Dali::Devel::PixelBuffer CreateVoidPixelBuffer( const Dali::TextAbstraction::TextRenderer::Parameters& parameters )
128 Dali::Pixel::Format pixelFormat = parameters.pixelFormat == Dali::TextAbstraction::TextRenderer::Parameters::A8 ? Dali::Pixel::A8 : Dali::Pixel::RGBA8888;
129 Dali::Devel::PixelBuffer pixelBuffer = Dali::Devel::PixelBuffer::New( parameters.width,
133 const unsigned int bufferSize = parameters.width * parameters.height * Dali::Pixel::GetBytesPerPixel( pixelFormat );
134 unsigned char* buffer = pixelBuffer.GetBuffer();
135 memset( buffer, 0, bufferSize );
141 * @brief Wraps the vertices of glyphs laid out on a horizontal strainght line on a circular path.
143 * It copies the vertices from the extra cairo context created to lay out the text
144 * on a horizontal straight line to the cairo context used to render it.
146 * @param[in,out] cr The cairo context used to render the text.
147 * @param[in] circularCr The extra cairo context created to layout horizontal text.
148 * @param[in] parameters The parameters of the circular path.
150 void WrapToCircularPath( cairo_t* cr, cairo_t* circularCr, const Dali::TextAbstraction::CircularTextParameters& parameters )
154 // Copy the path to get a cairo_path_t pointer used to iterate through all its items.
155 std::unique_ptr<cairo_path_t, void(*)(cairo_path_t*)> path( cairo_copy_path( circularCr ), cairo_path_destroy );
157 // Iterates through all the path items and transform each vertex to follow the circle.
158 // Transformed vertices are added to a new path in the 'cr' context (the one used to render the circular text)
159 for( int i = 0; i < path->num_data; i += path->data[i].header.length )
161 cairo_path_data_t* data = &path->data[i];
163 switch( data->header.type )
165 case CAIRO_PATH_MOVE_TO:
169 cairo_new_path( cr );
173 double x = data[1].point.x;
174 double y = data[1].point.y;
175 Dali::TextAbstraction::TransformToArc( parameters, x, y );
176 cairo_move_to( cr, x, y );
179 case CAIRO_PATH_LINE_TO:
181 double x = data[1].point.x;
182 double y = data[1].point.y;
183 Dali::TextAbstraction::TransformToArc( parameters, x, y );
184 cairo_line_to( cr, x, y );
187 case CAIRO_PATH_CURVE_TO:
189 double x1 = data[1].point.x;
190 double y1 = data[1].point.y;
191 double x2 = data[2].point.x;
192 double y2 = data[2].point.y;
193 double x3 = data[3].point.x;
194 double y3 = data[3].point.y;
195 Dali::TextAbstraction::TransformToArc( parameters, x1, y1 );
196 Dali::TextAbstraction::TransformToArc( parameters, x2, y2 );
197 Dali::TextAbstraction::TransformToArc( parameters, x3, y3 );
198 cairo_curve_to( cr, x1, y1, x2, y2, x3, y3 );
201 case CAIRO_PATH_CLOSE_PATH:
203 cairo_close_path( cr );
208 DALI_LOG_WARNING( "Type of path not handled.\n" );
209 // Nothing else to do.
221 namespace TextAbstraction
227 Devel::PixelBuffer RenderTextCairo( const TextAbstraction::TextRenderer::Parameters& parameters )
229 const unsigned int numberOfGlyphs = parameters.glyphs.Count();
231 if( 0u == numberOfGlyphs )
233 // return a pixel buffer with all pixels set to transparent.
234 return CreateVoidPixelBuffer( parameters );
237 // Convert from DALi glyphs to Cairo glyphs.
238 std::vector<cairo_glyph_t> cairoGlyphs;
239 cairoGlyphs.resize( numberOfGlyphs );
240 cairo_glyph_t* cairoGlyphsBuffer = &cairoGlyphs[0u];
242 const GlyphInfo* const daliGlyphsBuffer = parameters.glyphs.Begin();
243 const Vector2* const positionsBuffer = parameters.positions.Begin();
244 const ColorIndex* const colorIndicesBuffer = ( 0u == parameters.colorIndices.Count() ) ? nullptr : parameters.colorIndices.Begin();
246 for( unsigned index = 0u; index < numberOfGlyphs; ++index )
248 const GlyphInfo& daliGlyph = *( daliGlyphsBuffer + index );
249 const Vector2& position = *( positionsBuffer + index );
250 cairo_glyph_t& cairoGlyph = *( cairoGlyphsBuffer + index );
252 cairoGlyph.index = daliGlyph.index;
253 cairoGlyph.x = std::round( position.x );
254 cairoGlyph.y = std::round( position.y );
257 // Retrieve the FreeType fonts needed by Cairo from the font-client.
258 Dali::TextAbstraction::FontClient fontClient = Dali::TextAbstraction::FontClient::Get();
260 FT_Library ftLibrary;
261 auto error = FT_Init_FreeType( &ftLibrary );
264 DALI_LOG_ERROR( "Error initializing FT library\n" );
266 // return a pixel buffer with all pixels set to transparent.
267 return CreateVoidPixelBuffer( parameters );
270 // Vector used to store the FreeType font faces, its size and the run of glyphs that use the font.
271 std::vector<GlyphRun> glyphRuns;
272 glyphRuns.reserve( 8u );
274 // The size set in Cairo and FreeType has different units.
275 // Before the size is set in Cairo it needs to be converted according the formula
276 // 'pixel_size = point_size * resolution / 72' got from the FreeType doc.
277 // https://www.freetype.org/freetype2/docs/glyphs/glyphs-2.html
279 unsigned int horizontalDpi = 0u;
280 unsigned int verticalDpi = 0u;
281 fontClient.GetDpi( horizontalDpi, verticalDpi );
282 const double dVerticalDpi = static_cast<double>( verticalDpi );
284 const double FROM_26_DOT_6_TO_PIXELS = dVerticalDpi / ( 64.0 * 72.0 );
286 GlyphRun currentGlyphRun;
287 currentGlyphRun.fontId = 0u;
288 currentGlyphRun.colorIndex = 0u;
289 currentGlyphRun.isItalicRequired = false;
290 currentGlyphRun.isBoldRequired = false;
291 for( unsigned index = 0u; index < numberOfGlyphs; ++index )
293 const GlyphInfo& daliGlyph = *( daliGlyphsBuffer + index );
294 const FontId fontId = daliGlyph.fontId;
295 const ColorIndex colorIndex = ( nullptr == colorIndicesBuffer ) ? 0u : *( colorIndicesBuffer + index );
296 const bool isItalicRequired = daliGlyph.isItalicRequired;
297 const bool isBoldRequired = daliGlyph.isBoldRequired;
299 if( ( fontId != currentGlyphRun.fontId ) ||
300 ( ( 0u == fontId ) && ( 0u != daliGlyph.index ) ) ||
301 ( colorIndex != currentGlyphRun.colorIndex ) ||
302 ( isItalicRequired != currentGlyphRun.isItalicRequired ) ||
303 ( isBoldRequired != currentGlyphRun.isBoldRequired ) )
305 // There is a new run. First set the number of glyphs of the previous run and store it.
306 currentGlyphRun.numberOfGlyphs = index - currentGlyphRun.glyphIndex;
307 if( 0u != currentGlyphRun.numberOfGlyphs )
309 glyphRuns.push_back( currentGlyphRun );
312 currentGlyphRun.fontFace = nullptr;
313 currentGlyphRun.fontSize = 0.0;
314 currentGlyphRun.glyphIndex = index;
315 currentGlyphRun.numberOfGlyphs = 0u;
316 currentGlyphRun.fontId = 0u;
317 currentGlyphRun.colorIndex = 0u;
318 currentGlyphRun.isItalicRequired = false;
319 currentGlyphRun.isBoldRequired = false;
323 // Get the font's path file name from the font Id.
324 FontDescription fontDescription;
325 fontClient.GetDescription( fontId, fontDescription );
327 switch( fontDescription.type )
329 case FontDescription::FACE_FONT:
331 // Create a FreeType font's face.
332 auto error = FT_New_Face( ftLibrary, fontDescription.path.c_str(), 0u, ¤tGlyphRun.fontFace );
335 DALI_LOG_ERROR( "Error in FT while creating a new face\n" );
337 // return a pixel buffer with all pixels set to transparent.
338 return CreateVoidPixelBuffer( parameters );
341 // Set the font's size. It needs to be set in the Freetype font and in the Cairo's context.
342 unsigned int fontSize = fontClient.GetPointSize( fontId );
344 // Font's size to be set in the Cairo's context.
345 currentGlyphRun.fontSize = FROM_26_DOT_6_TO_PIXELS * static_cast<double>( fontSize );
348 case FontDescription::BITMAP_FONT:
360 currentGlyphRun.fontId = fontId;
361 currentGlyphRun.colorIndex = colorIndex;
362 currentGlyphRun.isItalicRequired = isItalicRequired;
363 currentGlyphRun.isBoldRequired = isBoldRequired;
367 // Calculate the number of glyphs of the last run and store it.
368 currentGlyphRun.numberOfGlyphs = numberOfGlyphs - currentGlyphRun.glyphIndex;
369 if( 0u != currentGlyphRun.numberOfGlyphs )
371 glyphRuns.push_back( currentGlyphRun );
374 // Choose the pixel format to be used.
376 // @note Behdad wrote "Upper 8 bits maps to the fourth byte in a little-endian machine like the intels."
377 // https://lists.cairographics.org/archives/cairo/2006-March/006563.html
379 // Here in practice Cairo's ARGB32 is like DALi's RGBA8888.
381 const bool isDstRgba = TextAbstraction::TextRenderer::Parameters::RGBA8888 == parameters.pixelFormat;
382 const Pixel::Format pixelFormat = isDstRgba ? Pixel::Format::RGBA8888 : Pixel::Format::A8;
383 const cairo_format_t cairoFormat = isDstRgba ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_A8;
385 // This function provides a stride value that will respect all alignment requirements of the
386 // accelerated image-rendering code within cairo.
387 const int stride = cairo_format_stride_for_width( cairoFormat,
388 static_cast<int>( parameters.width ) );
389 const int strideWidth = stride / Pixel::GetBytesPerPixel( pixelFormat );
391 // Creates the pixel buffer and retrieves the buffer pointer used to create the Cairo's surface.
392 Devel::PixelBuffer pixelBuffer = Devel::PixelBuffer::New( strideWidth, parameters.height, pixelFormat );
394 unsigned char* buffer = pixelBuffer.GetBuffer();
395 const unsigned int bufferSize = stride * parameters.height;
396 memset( buffer, 0, bufferSize );
398 std::unique_ptr<cairo_surface_t, void(*)(cairo_surface_t*)> surfacePtr( cairo_image_surface_create_for_data( buffer,
403 cairo_surface_destroy );
404 cairo_surface_t* surface = surfacePtr.get();
406 if( ( nullptr == surface ) || ( CAIRO_STATUS_SUCCESS != cairo_surface_status( surface ) ) )
408 DALI_LOG_ERROR( "Failed to create a cairo's surface\n" );
410 return CreateVoidPixelBuffer( parameters );
413 // Whether the text is circular.
414 const bool isCircularText = 0u != parameters.radius;
416 // Creates a surface for circular text.
418 // The reason to create a surface for circular text is that the strategy
419 // followed is to layout the text in a straight horizontal line and apply a
420 // transform to each vertex that forms the geometry of the glyphs to place
421 // and bend the glyphs accordingly to the circular path.
423 // As the glyphs are laid out first in a straight line they may exceed the
424 // boundaries of the surface in that case cairo ignores them.
425 std::unique_ptr<cairo_surface_t, void(*)(cairo_surface_t*)> circularSurfacePtr( nullptr, cairo_surface_destroy );
426 cairo_surface_t* circularSurface = nullptr;
429 circularSurfacePtr.reset( cairo_surface_create_similar( surface,
431 parameters.circularWidth,
432 parameters.circularHeight ) );
433 circularSurface = circularSurfacePtr.get();
435 if( ( nullptr == circularSurface ) || ( CAIRO_STATUS_SUCCESS != cairo_surface_status( circularSurface ) ) )
437 DALI_LOG_ERROR( "Failed to create a cairo's circular surface\n" );
439 return CreateVoidPixelBuffer( parameters );
443 std::unique_ptr<cairo_t, void(*)(cairo_t*)> crPtr( cairo_create( surface ), cairo_destroy );
444 cairo_t* cr = crPtr.get();
446 if( CAIRO_STATUS_SUCCESS != cairo_status( cr ) )
448 DALI_LOG_ERROR( "Failed to create a cairo context\n" );
450 return CreateVoidPixelBuffer( parameters );
453 std::unique_ptr<cairo_t, void(*)(cairo_t*)> circularCrPtr( nullptr, cairo_destroy );
454 cairo_t* circularCr = nullptr;
458 circularCrPtr.reset( cairo_create( circularSurface ) );
459 circularCr = circularCrPtr.get();
461 if( CAIRO_STATUS_SUCCESS != cairo_status( circularCr ) )
463 DALI_LOG_ERROR( "Failed to create a cairo context\n" );
465 return CreateVoidPixelBuffer( parameters );
469 CircularTextParameters circularTextParameters;
471 // Render the glyphs.
474 // Set the parameters.
475 circularTextParameters.isClockwise = ( TextAbstraction::TextRenderer::Parameters::CLOCKWISE == parameters.circularLayout );
477 circularTextParameters.centerX = static_cast<double>( parameters.centerX );
478 circularTextParameters.centerY = static_cast<double>( parameters.centerY );
479 circularTextParameters.radius = static_cast<double>( parameters.radius );
480 circularTextParameters.invRadius = 1.0 / circularTextParameters.radius;
481 circularTextParameters.beginAngle = -parameters.beginAngle + Dali::Math::PI_2;
484 cairo_move_to( cr, 0.0, 0.0 );
486 for( const auto& run: glyphRuns )
488 const bool isEmoji = parameters.isEmoji[run.glyphIndex];
489 if( isEmoji || ( nullptr == run.fontFace ) )
491 // Retrieve the color for the glyph.
492 const Vector4& color = parameters.colors[run.colorIndex];
494 const unsigned int lastGlyphIndex = run.glyphIndex + run.numberOfGlyphs;
495 for( unsigned int index = run.glyphIndex; index < lastGlyphIndex; ++index )
497 // Whether it's a bitmap font.
498 const bool doBlendWithTextColor = !isEmoji && ( ColorBlendingMode::MULTIPLY == parameters.blendingMode[index] );
500 // Check if there is an embedded image or a bitmap font image.
501 const GlyphIndex glyphFontIndex = daliGlyphsBuffer[index].index;
502 if( 0u != glyphFontIndex )
504 // The embedded image could be A8, RGBA8888 or BGRA8888.
506 // 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.
507 // 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.
509 const cairo_glyph_t& glyph = *( cairoGlyphsBuffer + index );
511 // Retrieve the image
512 TextAbstraction::FontClient::GlyphBufferData data;
513 std::unique_ptr<GlyphBuffer> glyphBufferPtr( new GlyphBuffer( data, GlyphBuffer::DELETE ) );
516 data.width = parameters.glyphs[run.glyphIndex].width;
517 data.height = parameters.glyphs[run.glyphIndex].height;
520 fontClient.CreateBitmap( run.fontId, glyphFontIndex, false, false, data, 0u );
522 if( nullptr == data.buffer )
524 // nothing else to do if there is no image.
528 // Calculate the position for the circular text.
529 double glyphX = glyph.x;
530 double glyphY = glyph.y;
534 // Center of the bitmap.
535 const double halfWidth = 0.5 * static_cast<double>( data.width );
536 const double halfHeight = 0.5 * static_cast<double>( data.height );
538 double centerX = glyph.x + halfWidth;
539 double centerY = glyph.y - halfHeight;
541 float radians = circularTextParameters.beginAngle + ( circularTextParameters.isClockwise ? -1.f : 1.f ) * ( Dali::Math::PI_2 + circularTextParameters.invRadius * centerX );
542 radians = fmod( radians, TWO_PI );
543 radians += ( radians < 0.f ) ? TWO_PI : 0.f;
545 TransformToArc( circularTextParameters, centerX, centerY );
547 uint8_t* pixelsOut = nullptr;
548 unsigned int widthOut = data.width;
549 unsigned int heightOut = data.height;
550 const unsigned int pixelSize = Pixel::GetBytesPerPixel( data.format );
552 Dali::Internal::Platform::RotateByShear( data.buffer,
560 if( nullptr != pixelsOut )
562 delete[] data.buffer;
563 data.buffer = pixelsOut;
564 glyphBufferPtr.get()->type = GlyphBuffer::FREE;
565 data.width = widthOut;
566 data.height = heightOut;
569 glyphX = centerX - 0.5 * static_cast<double>( data.width );
570 glyphY = centerY + 0.5 * static_cast<double>( data.height );
574 if( ( Pixel::A8 != data.format ) &&
575 ( Pixel::L8 != data.format ) &&
576 ( Pixel::RGBA8888 != data.format ) &&
577 ( Pixel::BGRA8888 != data.format ) )
579 DALI_LOG_ERROR( " Cairo Renderer: The valid pixel format for embedded items are A8 or RGBA8888\n" );
583 // Check if the item is out of the buffer.
584 if( ( glyphX + static_cast<float>( data.width ) < 0.f ) ||
585 ( glyphX > static_cast<float>( strideWidth ) ) ||
587 ( glyphY - static_cast<float>( data.height ) > static_cast<float>( parameters.height ) ) )
589 // The embedded item is completely out of the buffer.
593 const bool isSrcA = ( Pixel::A8 == data.format ) || ( Pixel::L8 == data.format );
594 const bool isSrcRgba = Pixel::RGBA8888 == data.format;
595 const bool isSrcBgra = Pixel::BGRA8888 == data.format;
597 // 0 -> image and cairo buffer are A8
598 // 1 -> image is A8, cairo buffer is ARGB
599 // 2 -> image is RGBA and cairo buffer is ARGB
600 // 3 -> image is BGRA and cairo buffer is ARGB
602 if( isSrcA && isDstRgba )
606 else if( isSrcRgba && isDstRgba )
610 else if( isSrcBgra && isDstRgba )
614 else if( ( isSrcRgba || isSrcBgra ) && !isDstRgba )
616 DALI_LOG_ERROR( "Cairo Renderer: The embedded image is RGBA or BGRA and the Cairo's buffer has been creates with A8 format!\n" );
620 // Select the cropped source image area to copy into the surface buffer
621 unsigned int glyphUintX = 0u;
622 unsigned int glyphUintY = 0u;
623 unsigned int srcWidth = data.width;
624 unsigned int srcHeight = data.height;
625 unsigned int xSrcIndex = 0u;
626 unsigned int ySrcIndex = 0u;
629 xSrcIndex = static_cast<unsigned int>( std::abs( glyphX ) );
630 srcWidth -= xSrcIndex;
634 glyphUintX = static_cast<unsigned int>( glyphX );
637 if( glyphUintX + srcWidth > static_cast<unsigned int>( strideWidth ) )
639 srcWidth -= ( ( glyphUintX + srcWidth ) - strideWidth );
642 if( glyphY - static_cast<float>( srcHeight ) < 0.f )
644 ySrcIndex = static_cast<unsigned int>( std::abs( glyphY - static_cast<float>( srcHeight ) ) );
645 srcHeight -= ySrcIndex;
649 glyphUintY = static_cast<unsigned int>( glyphY - static_cast<float>( srcHeight ) );
652 if( glyphUintY + srcHeight > parameters.height )
654 srcHeight -= ( ( glyphUintY + srcHeight ) - parameters.height );
657 // Calculate the source and destination indices.
658 const unsigned int srcPixelSize = Pixel::GetBytesPerPixel( data.format );
659 const unsigned int dstPixelSize = Pixel::GetBytesPerPixel( pixelFormat );
661 unsigned int srcIndex = srcPixelSize * ( ySrcIndex * srcWidth + xSrcIndex );
662 unsigned int dstIndex = dstPixelSize * ( glyphUintY * strideWidth + glyphUintX );
664 const unsigned int srcWidthOffset = srcPixelSize * ( data.width - srcWidth );
665 const unsigned int dstWidthOffset = dstPixelSize * ( strideWidth - srcWidth );
667 // Copy the image to the surface
668 for( unsigned int j = 0; j < srcHeight; ++j )
670 for( unsigned int i = 0; i < srcWidth; ++i )
674 case 0: // Both the image's buffer and cairo's buffer are A8
676 const unsigned char alpha = *( data.buffer + srcIndex );
679 // @todo needs a proper blending!
680 *( buffer + dstIndex ) = alpha;
684 case 1: // The image's buffer is A8 and the cairo's buffer is ARGB
686 const unsigned char alpha = *( data.buffer + srcIndex );
689 // @todo needs a proper blending!
690 const float srcAlpha = TO_FLOAT * static_cast<float>( alpha );
692 // Write the RGBA modulated with the given default color.
693 const float* const colorPtr = color.AsFloat();
694 *( buffer + dstIndex + 0u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[0u] * srcAlpha );
695 *( buffer + dstIndex + 1u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[1u] * srcAlpha );
696 *( buffer + dstIndex + 2u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[2u] * srcAlpha );
697 *( buffer + dstIndex + 3u ) = static_cast<unsigned char>( TO_UCHAR * colorPtr[3u] * srcAlpha );
701 case 2: // The image's buffer is RGBA and the cairo's buffer is ARGB
703 const unsigned char alpha = *(data.buffer + srcIndex + 3u);
706 if( doBlendWithTextColor )
708 const float* const colorPtr = color.AsFloat();
710 const float srcAlpha = TO_FLOAT * static_cast<float>(alpha) * colorPtr[3u];
712 *(buffer + dstIndex + 0u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 0u) ) * colorPtr[0u] );
713 *(buffer + dstIndex + 1u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 1u) ) * colorPtr[1u] );
714 *(buffer + dstIndex + 2u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 2u) ) * colorPtr[2u] );
717 *(buffer + dstIndex + 3u) = static_cast<unsigned char>( TO_UCHAR * srcAlpha );
721 // @todo needs a proper blending!
723 *(buffer + dstIndex + 0u) = *(data.buffer + srcIndex + 0u);
724 *(buffer + dstIndex + 1u) = *(data.buffer + srcIndex + 1u);
725 *(buffer + dstIndex + 2u) = *(data.buffer + srcIndex + 2u);
728 *(buffer + dstIndex + 3u) = *(data.buffer + srcIndex + 3u);
733 case 3: // The image's buffer is BGRA and the cairo's buffer is ARGB
735 const unsigned char alpha = *(data.buffer + srcIndex + 3u);
738 if( doBlendWithTextColor )
740 const float* const colorPtr = color.AsFloat();
742 const float srcAlpha = TO_FLOAT * static_cast<float>(alpha) * colorPtr[3u];
744 *(buffer + dstIndex + 0u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 2u) ) * colorPtr[0u] );
745 *(buffer + dstIndex + 1u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 1u) ) * colorPtr[1u] );
746 *(buffer + dstIndex + 2u) = static_cast<unsigned char>( static_cast<float>( *(data.buffer + srcIndex + 0u) ) * colorPtr[2u] );
749 *(buffer + dstIndex + 3u) = static_cast<unsigned char>( TO_UCHAR * srcAlpha );
753 // @todo needs a proper blending!
755 *(buffer + dstIndex + 0u) = *(data.buffer + srcIndex + 2u);
756 *(buffer + dstIndex + 1u) = *(data.buffer + srcIndex + 1u);
757 *(buffer + dstIndex + 2u) = *(data.buffer + srcIndex + 0u);
758 *(buffer + dstIndex + 3u) = *(data.buffer + srcIndex + 3u);
765 DALI_ASSERT_ALWAYS( !"Cairo Renderer: The accepted values for this switch case are: 0, 1, 2!" );
768 srcIndex += srcPixelSize;
769 dstIndex += dstPixelSize;
771 srcIndex += srcWidthOffset;
772 dstIndex += dstWidthOffset;
779 // Sets the color. The color is actually BGRA
780 const Vector4& color = parameters.colors[run.colorIndex];
782 cairo_set_source_rgba( cr,
783 static_cast<double>( color.b ),
784 static_cast<double>( color.g ),
785 static_cast<double>( color.r ),
786 static_cast<double>( color.a ) );
788 // Create the Cairo's font from the FreeType font.
790 options = CAIRO_HINT_STYLE_SLIGHT;
791 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 );
792 cairo_font_face_t* fontFace = fontFacePtr.get();
794 static const cairo_user_data_key_t key = { 0 };
795 cairo_status_t status = cairo_font_face_set_user_data( fontFace, &key, run.fontFace, reinterpret_cast<cairo_destroy_func_t>( FT_Done_Face ) );
798 cairo_font_face_destroy( fontFace );
801 unsigned int ftSynthesizeFlag = 0u;
802 if( run.isBoldRequired && !( run.fontFace->style_flags & FT_STYLE_FLAG_BOLD ) )
804 ftSynthesizeFlag |= CAIRO_FT_SYNTHESIZE_BOLD;
807 cairo_ft_font_face_set_synthesize( fontFace, ftSynthesizeFlag );
809 cairo_font_face_reference( fontFace );
811 const bool synthesizeItalic = ( run.isItalicRequired && !( run.fontFace->style_flags & FT_STYLE_FLAG_ITALIC ) );
813 if( CAIRO_STATUS_SUCCESS != cairo_font_face_status( fontFace ) )
815 DALI_LOG_ERROR( "Failed to load the Freetype Font\n" );
819 cairo_set_font_face( isCircularText ? circularCr : cr, fontFace );
822 cairo_set_font_size( isCircularText ? circularCr : cr, run.fontSize );
824 // Render the glyphs.
827 circularTextParameters.synthesizeItalic = synthesizeItalic;
829 const unsigned int glyphJump = circularTextParameters.synthesizeItalic ? 1u : run.numberOfGlyphs;
831 for( unsigned int index = 0u; index < run.numberOfGlyphs; index += glyphJump )
833 // Clears the current path where the text is laid out on a horizontal straight line.
834 cairo_new_path( circularCr );
835 cairo_move_to( circularCr, 0.0, 0.0 );
837 cairo_glyph_path( circularCr, ( cairoGlyphsBuffer + run.glyphIndex + index ), glyphJump );
839 WrapToCircularPath( cr, circularCr, circularTextParameters );
845 if( synthesizeItalic )
847 // Apply a shear transform to synthesize the italics.
848 // For a reason Cairo may trim some glyphs if the CAIRO_FT_SYNTHESIZE_OBLIQUE flag is used.
850 // This is to calculate an offset used to compensate the 'translation' done by the shear transform
851 // as it's done for the whole render buffer.
853 for( unsigned int index = run.glyphIndex, endIndex = run.glyphIndex + run.numberOfGlyphs; index < endIndex; ++index )
855 maxY = std::max( maxY, (*( cairoGlyphsBuffer + index )).y );
858 cairo_matrix_t matrix;
859 cairo_matrix_init( &matrix,
861 -TextAbstraction::FontClient::DEFAULT_ITALIC_ANGLE, 1.0,
862 maxY * TextAbstraction::FontClient::DEFAULT_ITALIC_ANGLE, 0.0 );
864 cairo_transform( cr, &matrix );
867 cairo_show_glyphs( cr, ( cairoGlyphsBuffer + run.glyphIndex ), run.numberOfGlyphs );
869 if( synthesizeItalic )
871 // Restore the transform matrix to the identity.
872 cairo_matrix_t matrix;
873 cairo_matrix_init_identity( &matrix );
874 cairo_set_matrix( cr, &matrix );
885 } // namespace Internal
887 } // namespace TextAbstraction