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When saveimage in pdfextract.c, if original image has mask, need to blend 2 images to 1 image #19

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When saveimage in pdfextract.c, if original image has mask, need to blend 2 images to 1 image #19

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32 changes: 32 additions & 0 deletions source/tools/pdfextract.c
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,38 @@ static void saveimage(pdf_obj *ref)
else
{
pix = fz_get_pixmap_from_image(ctx, image, NULL, NULL, 0, 0);

// if original image has mask, need to blend 2 images to 1 image
if (image->mask)
{
int x=0, y=0;
fz_pixmap* pImageMask = fz_get_pixmap_from_image(ctx,image->mask, NULL, NULL, 0, 0);
//Create new image with alpha for store image mask
fz_pixmap* pBlendImage = fz_new_pixmap(ctx, pix->colorspace, pix->w, pix->h, pix->seps, 1);
unsigned char* pOriginalImage = fz_pixmap_samples(ctx, pix);
unsigned char* pMask = fz_pixmap_samples(ctx, pImageMask);
unsigned char* pBlend = fz_pixmap_samples(ctx, pBlendImage);
int areapos = 0;
//Note: if original image is not alpha, n=3; if original image is alpha, n=4
int nStoreBitForOri = pix->n;

for (y=0; y < pix->h; y++)
{
for (x=0; x < pix->w; x++)
{
areapos = y * pix->w + x;
pBlend[areapos * 4 + 0] = pOriginalImage[areapos * nStoreBitForOri + 0];
pBlend[areapos * 4 + 1] = pOriginalImage[areapos * nStoreBitForOri + 1];
pBlend[areapos * 4 + 2] = pOriginalImage[areapos * nStoreBitForOri + 2];
pBlend[areapos * 4 + 3] = pMask[areapos + 0];
}
}

fz_drop_pixmap(ctx, pImageMask);
fz_drop_pixmap(ctx, pix);
pix = pBlendImage;
}

writepixmap(ctx, pix, buf, dorgb);
}
}
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