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分享SetDIBitsToDevice 或 StretchDIBits 怎样实现图像快速上下翻转?
记得以前把一个参数变为负就可以,现在怎么都试不出来, 是不是因为在DirectDraw中使用的原因?
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boytomato 2006-10-24
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gdi+中的
myBitmap.RotateFlip
myBitmap.RotateFlip
e_feeling 2006-10-03
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up
会思考的草 2006-09-26
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BITMAPINFO里高度值符号改变就可以了。
jerry 2006-09-26
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StretchBlt( dc, 0, 0, width, height, hMemDC, 0, y+height-1, width, -height, SRCCOPY);
pomelowu 2006-09-26
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StretchBlt( dc, 0, 0, width, height, hMemDC, 0, y+height-1, width, -height, SRCCOPY);
booklove 2006-09-26
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StretchBlt( dc, 0, 0, width, height, hMemDC, 0, height-1, width, -height, SRCCOPY);
cczlp 2006-09-26
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nDestHeight置为负值图像显示不对.
一楼的没看明白.
一楼的没看明白.
goodboyws 2006-09-26
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nDestHeight置为负值就可以
pomelowu 2006-09-26
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In StretchBlt, or StretchDIBits, instead of using y with height, use y + height - 1 with - height
crumpy 2006-09-26
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StretchDIBits
creates a mirror image of a bitmap if the signs of the nSrcWidth and nDestWidth parameters, or if the nSrcHeight and nDestHeight parameters differ. If nSrcWidth and nDestWidth have different signs, the function creates a mirror image of the bitmap along the x-axis. If nSrcHeight and nDestHeight have different signs, the function creates a mirror image of the bitmap along the y-axis.
creates a mirror image of a bitmap if the signs of the nSrcWidth and nDestWidth parameters, or if the nSrcHeight and nDestHeight parameters differ. If nSrcWidth and nDestWidth have different signs, the function creates a mirror image of the bitmap along the x-axis. If nSrcHeight and nDestHeight have different signs, the function creates a mirror image of the bitmap along the y-axis.
crumpy 2006-09-26
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mark...
StretchDIBits中改变Source Rectangle中Height的符号, 或者改变Destination Rectangle中Height的符号均可实现垂直翻转.
SetDIBitsToDevice好象不支持翻转.
StretchDIBits中改变Source Rectangle中Height的符号, 或者改变Destination Rectangle中Height的符号均可实现垂直翻转.
SetDIBitsToDevice好象不支持翻转.
vcPlayer 2006-09-26
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BITMAPINFO里高度值符号改变就可以了。
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资料里也这么说！可当我把它改为负值重新存储为新文件后，却不能用正常的绘图程序打开。
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资料里也这么说！可当我把它改为负值重新存储为新文件后，却不能用正常的绘图程序打开。
