implemented resampled text ("high quality")

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@87 0fc631ac-6414-0410-93d0-97cfa31319b6
2026-06-11 05:07:00 -04:00 · 2006-11-22 20:23:28 +00:00
parent 11a0276232
commit e2544e9d53
22 changed files with 349 additions and 127 deletions
@@ -0,0 +1,92 @@
+//+----------------------------------------------------------------------------+
+//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
+//| Copyright:    (C) 2001 - 2006 Twan van Laarhoven                           |
+//| License:      GNU General Public License 2 or later (see file COPYING)     |
+//+----------------------------------------------------------------------------+
+
+// ----------------------------------------------------------------------------- : Includes
+
+#include <gfx/gfx.hpp>
+#include <util/error.hpp>
+#include <gui/util.hpp> // clearDC_black
+
+// ----------------------------------------------------------------------------- : Resampled text
+
+// scaling factor to use when drawing resampled text
+const int text_scaling = 4;
+
+// Fills an image with the specified color
+void fill_image(Image& image, const Color& color) {
+	Byte* pos = image.GetData();
+	Byte* end = image.GetData() + image.GetWidth() * image.GetHeight() * 3;
+	while (pos != end) {
+		pos[0] = color.Red();
+		pos[1] = color.Green();
+		pos[2] = color.Blue();
+		pos += 3;
+	}
+}
+
+// Downsamples the red channel of the input image to the alpha channel of the output image
+// img_in must be text_scaling times as large as img_out
+void downsample_to_alpha(Image& img_in, Image& img_out) {
+	assert(img_in.GetWidth()  == img_out.GetWidth()  * text_scaling);
+	assert(img_in.GetHeight() == img_out.GetHeight() * text_scaling);
+	
+	// scale in the x direction, this overwrites parts of the input image
+	Byte* in  = img_in.GetData();
+	Byte* out = img_in.GetData();
+	int count = img_out.GetWidth() * img_in.GetHeight();
+	for (int i = 0 ; i < count ; ++i) {
+		int total = 0;
+		for (int j = 0 ; j < text_scaling ; ++j) {
+			total += in[3 * (j + text_scaling * i)];
+		}
+		out[i] = total / text_scaling;
+	}
+	
+	// now scale in the y direction, and write to the output alpha
+	img_out.InitAlpha();
+	out   = img_out.GetAlpha();
+	int line_size = img_out.GetWidth();
+	for (int y = 0 ; y < img_out.GetHeight() ; ++y) {
+		for (int x = 0 ; x < img_out.GetWidth() ; ++x) {
+			int total = 0;
+			for (int j = 0 ; j < text_scaling ; ++j) {
+				total += in[x + line_size * (j + text_scaling * y)];
+			}
+			out[x + line_size * y] = total / text_scaling;
+		}
+	}
+}
+
+// Draw text by first drawing it using a larger font and then downsampling it
+// optionally rotated by an angle
+//  (w2,h2) = size of text
+//  (wc,hc) = the corner where drawing should begin, (0,0) for top-left, (1,1) for bottom-right
+void draw_resampled_text(DC& dc, const RealRect& rect, int wc, int hc, int angle, const String& text) {
+	// enlarge slightly
+	int w = rect.width + 1, h = rect.height + 1;
+	// determine sub-pixel position
+	int xi = rect.x, yi = rect.y;
+	int xsub = text_scaling * (rect.x - xi), ysub = text_scaling * (rect.y - yi);
+	// draw text
+	Bitmap buffer(w * text_scaling, h * text_scaling, 24); // should be initialized to black
+	wxMemoryDC mdc;
+	mdc.SelectObject(buffer);
+	clearDC_black(mdc);
+	// now draw the text
+	mdc.SetFont(dc.GetFont());
+	mdc.SetTextForeground(*wxWHITE);
+	mdc.DrawRotatedText(text, wc * w * text_scaling + xsub, hc * h * text_scaling + ysub, angle);
+	// get image
+	mdc.SelectObject(wxNullBitmap);
+	Image img_large = buffer.ConvertToImage();
+	// step 2. sample down
+	Image img_small(w, h, false);
+	fill_image(img_small, dc.GetTextForeground());
+	downsample_to_alpha(img_large, img_small);
+	// step 3. draw to dc
+	dc.DrawBitmap(img_small, xi + wc * (rect.width - w), yi + hc * (rect.height - h));
+}
+