a2045aa1f6
Place one or multiple stamps on scanned pages in defined locations. A stamp is understood here as - a transparent text in a transparent frame with no borders - an opaque text on an opaque background with no borders. Stamp parameters: - text - font - foreground colour - background colour - angle of rotation - transparency. Locations: - centre - cardinal directions - inter-cardinal directions.
122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
// /*
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// * File: StampWorker.cpp
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// * Author: Saleem Edah-Tally - nmset@yandex.com
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// * License : CeCILL-C
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// * Copyright Saleem Edah-Tally - © 2025
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// *
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// * Created on 02 07 2025, 21:23
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// */
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#include "StampWorker.h"
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#include <math.h> // M_PI
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wxImage StampWorker::CreateStamp(StampDescriptor * descriptor, int scanResolution)
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{
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/*
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* Rescale the font point size of the stamp according to the scan resolution.
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* Exclude rescaling on v4l that does not have a resolution parameter.
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*/
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wxFont dcFont(descriptor->font);
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double scale = (scanResolution > 0)
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? (double) scanResolution / 72.0
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:1.0;
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wxCoord extentWidth, extentHeight, textLineHeight;
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{
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wxMemoryDC dc;
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if (scale != 1.0)
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dcFont.SetFractionalPointSize(descriptor->font.GetFractionalPointSize() * scale);
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dc.SetFont(dcFont); // Mandatory despite set below.
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dc.GetMultiLineTextExtent(descriptor->text, &extentWidth, &extentHeight, &textLineHeight, &dcFont);
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}
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wxBitmap bmp;
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// bmp.UseAlpha(true); // Not mandatory.
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bmp.Create(extentWidth, extentHeight); // Memo: See CreateWithDIPSize
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wxImage img0, img;
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wxMemoryDC dc(bmp);
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dc.SetFont(dcFont);
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if (descriptor->transparent)
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{
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// +++, Use the red channel only: used by ConvertColourToAlpha().
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// The chosen value is inversely proportional to the transparency of the text itself.
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dc.SetTextForeground(wxColour(128, 0, 0)); // A good mean is reasonable.
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dc.SetBackgroundMode(wxBRUSHSTYLE_TRANSPARENT);
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}
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else
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{
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dc.SetTextForeground(descriptor->foregroundColour);
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dc.SetTextBackground(descriptor->backgroundColour);
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dc.SetBackgroundMode(wxBRUSHSTYLE_SOLID);
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}
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dc.DrawText(descriptor->text, wxPoint(0, 0));
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img0 = bmp.ConvertToImage();
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if (!descriptor->transparent)
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img0.InitAlpha(); // So that there is no dark surrounding if it is rotated.
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img = img0.Rotate((M_PI / 180.0) * descriptor->rotationAngle, wxPoint(0, 0));
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if (descriptor->transparent)
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{
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img.ConvertColourToAlpha(descriptor->foregroundColour.GetRed(),
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descriptor->foregroundColour.GetGreen(),
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descriptor->foregroundColour.GetBlue()); // The target colour is passed in.
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img.ChangeSaturation(-0.7); // Slightly better looking.
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}
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return img;
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}
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void StampWorker::StampBackground(wxImage& background,
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const wxImage& stamp, int location)
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{
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// Simply pasting the stamp on the background, i.e., the scanned page.
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wxPoint bgCentre(background.GetWidth() / 2, background.GetHeight() / 2);
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wxPoint stampCentre(stamp.GetWidth() / 2, stamp.GetHeight() / 2);
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int x = 0, y = 0;
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switch (location)
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{
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case NORTH:
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x = bgCentre.x - stampCentre.x;
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y = 0;
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break;
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case SOUTH:
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x = bgCentre.x - stampCentre.x;
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y = background.GetHeight() - stamp.GetHeight();
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break;
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case EAST:
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x = background.GetWidth() - stamp.GetWidth();
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y = bgCentre.y - stampCentre.y;
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break;
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case WEST:
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x = 0;
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y = bgCentre.y - stampCentre.y;
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break;
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case NORTH_EAST:
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x = background.GetWidth() - stamp.GetWidth();
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y = 0;
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break;
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case NORTH_WEST:
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x = 0;
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y = 0;
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break;
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case SOUTH_EAST:
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x = background.GetWidth() - stamp.GetWidth();
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y = background.GetHeight() - stamp.GetHeight();
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break;
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case SOUTH_WEST:
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x = 0;
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y = background.GetHeight() - stamp.GetHeight();
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break;
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default: // CENTRE
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x = bgCentre.x - stampCentre.x;
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y = bgCentre.y - stampCentre.y;
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break;
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}
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wxPoint stampLocation(x, y);
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background.Paste(stamp, stampLocation.x, stampLocation.y, wxIMAGE_ALPHA_BLEND_COMPOSE);
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}
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