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Fixed some corner cases in the rotation code (rotation + scaling + stretching)

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git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@628 0fc631ac-6414-0410-93d0-97cfa31319b6
This commit is contained in:
twanvl
2007-08-25 00:53:39 +00:00
parent 694566fef4
commit 3937f217a0
3 changed files with 55 additions and 17 deletions
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src/gfx/resample_text.cpp
+43 -10
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@@ -20,8 +20,6 @@ const int text_scaling = 4;
// 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.GetHeight() == img_out.GetHeight() * text_scaling);
Byte* temp = nullptr;
Byte* in = img_in.GetData();
Byte* out = img_in.GetData();
@@ -74,13 +72,46 @@ void downsample_to_alpha(Image& img_in, Image& img_out) {
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 < line_size ; ++x) {
int total = 0;
for (int j = 0 ; j < text_scaling ; ++j) {
total += in[x + line_size * (j + text_scaling * y)];
int h = img_out.GetHeight();
if (img_in.GetHeight() == h * text_scaling) {
// no stretching
for (int y = 0 ; y < h ; ++y) {
for (int x = 0 ; x < line_size ; ++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;
}
out[x + line_size * y] = total / text_scaling;
}
} else {
const int shift = 32-12-8; // => max size = 4096, max alpha = 255
int h1 = img_in.GetHeight(), w = img_out.GetWidth();
int out_fact = (h << shift) / h1; // how much to output for 256 input = 1 pixel
int out_rest = (h << shift) % h1;
for (int x = 0 ; x < w ; ++x) {
int in_rem = out_fact + out_rest;
for (int y = 0 ; y < h ; ++y) {
int out_rem = 1 << shift;
int tot = 0;
while (out_rem >= in_rem) {
// eat a whole input pixel
tot += *in * in_rem;
out_rem -= in_rem;
in_rem = out_fact;
in += line_size;
}
if (out_rem > 0) {
// eat a partial input pixel
tot += *in * out_rem;
in_rem -= out_rem;
}
// store
*out = tot >> shift;
out += line_size;
}
in = in - h1 * line_size + 1;
out = out - h * line_size + 1;
}
}
@@ -113,7 +144,7 @@ void blur_image_alpha(Image& img) {
// 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, double stretch_x, int wc, int hc, int angle, const String& text, int blur_radius, int repeat) {
void draw_resampled_text(DC& dc, const RealRect& rect, double stretch, int wc, int hc, int angle, const String& text, int blur_radius, int repeat) {
// enlarge slightly; some fonts are larger then the GetTextExtent tells us (especially italic fonts)
int w = static_cast<int>(rect.width) + 3 + 2 * blur_radius, h = static_cast<int>(rect.height) + 1 + 2 * blur_radius;
// determine sub-pixel position
@@ -132,7 +163,9 @@ void draw_resampled_text(DC& dc, const RealRect& rect, double stretch_x, int wc,
mdc.SelectObject(wxNullBitmap);
Image img_large = buffer.ConvertToImage();
// step 2. sample down
Image img_small(stretch_x * w, h, false);
if ((angle & 2) == 0) w *= stretch;
else h *= stretch;
Image img_small(w, h, false);
fill_image(img_small, dc.GetTextForeground());
downsample_to_alpha(img_large, img_small);
// blur