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Cairo GAL: improve empty canvas performance (-80% CPU) 

(cherry picked from commit 5618a6925d)
This commit is contained in:
Alex Shvartzkop 2024-02-28 03:42:24 +03:00 committed by dsa-t
parent 9e7b4b7f89
commit 4fed2e849f
1 changed files with 26 additions and 12 deletions
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38
common/gal/cairo/cairo_gal.cpp
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@ -1413,20 +1413,34 @@ void CAIRO_GAL::EndDrawing()
// Now translate the raw context data from the format stored
// by cairo into a format understood by wxImage.
pixman_image_t* dstImg = pixman_image_create_bits(
wxPlatformInfo::Get().GetEndianness() == wxENDIAN_LITTLE ? PIXMAN_b8g8r8
: PIXMAN_r8g8b8,
m_screenSize.x, m_screenSize.y, (uint32_t*) m_wxOutput, m_wxBufferWidth * 3 );
pixman_image_t* srcImg =
pixman_image_create_bits( PIXMAN_a8r8g8b8, m_screenSize.x, m_screenSize.y,
(uint32_t*) m_bitmapBuffer, m_wxBufferWidth * 4 );
int height = m_screenSize.y;
int stride = m_stride;
pixman_image_composite( PIXMAN_OP_SRC, srcImg, nullptr, dstImg, 0, 0, 0, 0, 0, 0,
m_screenSize.x, m_screenSize.y );
unsigned char* srcRow = m_bitmapBuffer;
unsigned char* dst = m_wxOutput;
// Free allocated memory
pixman_image_unref( srcImg );
pixman_image_unref( dstImg );
for( int y = 0; y < height; y++ )
{
for( int x = 0; x < stride; x += 4 )
{
const unsigned char* src = srcRow + x;
#if defined( __BYTE_ORDER__ ) && ( __BYTE_ORDER == __BIG_ENDIAN )
// XRGB
dst[0] = src[1];
dst[1] = src[2];
dst[2] = src[3];
#else
// BGRX
dst[0] = src[2];
dst[1] = src[1];
dst[2] = src[0];
#endif
dst += 3;
}
srcRow += stride;
}
wxImage img( m_wxBufferWidth, m_screenSize.y, m_wxOutput, true );
wxBitmap bmp( img );