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https://github.com/python-pillow/Pillow.git
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use FT_Bitmap_Convert instead of reimplementing the wheel
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nulano
parent
55db572467
commit
bf529303de
122
src/_imagingft.c
122
src/_imagingft.c
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@ -25,6 +25,7 @@
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_GLYPH_H
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#include FT_BITMAP_H
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#include FT_STROKER_H
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#include FT_MULTIPLE_MASTERS_H
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#include FT_SFNT_NAMES_H
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@ -837,14 +838,17 @@ font_render(FontObject* self, PyObject* args)
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FT_Glyph glyph;
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FT_GlyphSlot glyph_slot;
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FT_Bitmap bitmap;
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FT_Bitmap bitmap_converted; /* initialized lazily, for non-8bpp fonts */
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FT_BitmapGlyph bitmap_glyph;
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FT_Stroker stroker = NULL;
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int bitmap_converted_ready = 0; /* has bitmap_converted been initialized */
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GlyphInfo *glyph_info = NULL; /* computed text layout */
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size_t i, count; /* glyph_info index and length */
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int xx, yy; /* pixel offset of current glyph bitmap */
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int x0, x1; /* horizontal bounds of glyph bitmap to copy */
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unsigned int bitmap_y; /* glyph bitmap y index */
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unsigned char *source; /* glyph bitmap source buffer */
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unsigned char convert_scale; /* scale factor for non-8bpp bitmaps */
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Imaging im;
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Py_ssize_t id;
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int horizontal_dir; /* is primary axis horizontal? */
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@ -980,6 +984,49 @@ font_render(FontObject* self, PyObject* args)
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yy = -(py + glyph_slot->bitmap_top);
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}
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/* convert non-8bpp bitmaps */
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switch (bitmap.pixel_mode) {
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case FT_PIXEL_MODE_MONO:
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convert_scale = 255;
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break;
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case FT_PIXEL_MODE_GRAY2:
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convert_scale = 255 / 3;
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break;
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case FT_PIXEL_MODE_GRAY4:
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convert_scale = 255 / 15;
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break;
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default:
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convert_scale = 1;
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}
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switch (bitmap.pixel_mode) {
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case FT_PIXEL_MODE_MONO:
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case FT_PIXEL_MODE_GRAY2:
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case FT_PIXEL_MODE_GRAY4:
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if (!bitmap_converted_ready) {
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FT_Bitmap_Init(&bitmap_converted);
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bitmap_converted_ready = 1;
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}
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error = FT_Bitmap_Convert(library, &bitmap, &bitmap_converted, 1);
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if (error) {
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geterror(error);
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goto glyph_error;
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}
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bitmap = bitmap_converted;
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/* bitmap is now FT_PIXEL_MODE_GRAY, fall through */
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case FT_PIXEL_MODE_GRAY:
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break;
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#ifdef FT_LOAD_COLOR
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case FT_PIXEL_MODE_BGRA:
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if (color) {
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break;
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}
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/* we didn't ask for color, fall through to default */
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#endif
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default:
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PyErr_SetString(PyExc_IOError, "unsupported bitmap pixel mode");
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goto glyph_error;
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}
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/* clip glyph bitmap width to target image bounds */
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x0 = 0;
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x1 = bitmap.width;
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@ -994,7 +1041,9 @@ font_render(FontObject* self, PyObject* args)
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for (bitmap_y = 0; bitmap_y < bitmap.rows; bitmap_y++, yy++) {
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/* clip glyph bitmap height to target image bounds */
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if (yy >= 0 && yy < im->ysize) {
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// blend this glyph into the buffer
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/* blend this glyph into the buffer */
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int k;
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unsigned char v;
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unsigned char* target;
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if (color) {
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/* target[RGB] returns the color, target[A] returns the mask */
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@ -1005,8 +1054,7 @@ font_render(FontObject* self, PyObject* args)
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}
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#ifdef FT_LOAD_COLOR
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if (color && bitmap.pixel_mode == FT_PIXEL_MODE_BGRA) {
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// paste color glyph
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int k;
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/* paste color glyph */
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for (k = x0; k < x1; k++) {
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if (target[k * 4 + 3] < source[k * 4 + 3]) {
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/* unpremultiply BGRa to RGBA */
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@ -1018,62 +1066,28 @@ font_render(FontObject* self, PyObject* args)
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}
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} else
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#endif
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// handle 8bpp separately for performance
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if (bitmap.pixel_mode == FT_PIXEL_MODE_GRAY) {
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int k;
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if (color) {
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for (k = x0; k < x1; k++) {
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if (target[k * 4 + 3] < source[k]) {
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target[k * 4 + 0] = (unsigned char) (foreground_ink);
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target[k * 4 + 1] = (unsigned char) (foreground_ink >> 8);
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target[k * 4 + 2] = (unsigned char) (foreground_ink >> 16);
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target[k * 4 + 3] = source[k];
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v = source[k] * convert_scale;
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if (target[k * 4 + 3] < v) {
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target[k * 4 + 0] = (unsigned char)(foreground_ink);
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target[k * 4 + 1] = (unsigned char)(foreground_ink >> 8);
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target[k * 4 + 2] = (unsigned char)(foreground_ink >> 16);
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target[k * 4 + 3] = v;
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}
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}
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} else {
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for (k = x0; k < x1; k++) {
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if (target[k] < source[k]) {
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target[k] = source[k];
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}
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}
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}
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} else {
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int k, v, m, a, b;
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switch (bitmap.pixel_mode) {
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case FT_PIXEL_MODE_MONO:
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a = 3;
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b = 7;
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m = 0x80;
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break;
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case FT_PIXEL_MODE_GRAY2:
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a = 2;
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b = 3;
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m = 0xC0;
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break;
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case FT_PIXEL_MODE_GRAY4:
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a = 1;
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b = 1;
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m = 0xF0;
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break;
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default:
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PyErr_SetString(PyExc_IOError, "unsupported bitmap pixel mode");
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return NULL;
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}
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for (k = x0; k < x1; k++) {
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v = CLIP8(255 * ((source[k >> a] << (k & b)) & m) / m);
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if (color) {
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if (target[k * 4 + 3] < v) {
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target[k * 4 + 0] = (unsigned char) foreground_ink;
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target[k * 4 + 1] = (unsigned char) (foreground_ink >> 8);
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target[k * 4 + 2] = (unsigned char) (foreground_ink >> 16);
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target[k * 4 + 3] = v;
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}
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} else {
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v = source[k] * convert_scale;
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if (target[k] < v) {
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target[k] = v;
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}
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}
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}
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} else {
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PyErr_SetString(PyExc_IOError, "unsupported bitmap pixel mode");
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goto glyph_error;
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}
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}
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source += bitmap.pitch;
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@ -1085,9 +1099,23 @@ font_render(FontObject* self, PyObject* args)
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}
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}
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if (bitmap_converted_ready) {
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FT_Bitmap_Done(library, &bitmap_converted);
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}
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FT_Stroker_Done(stroker);
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PyMem_Del(glyph_info);
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Py_RETURN_NONE;
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glyph_error:
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if (stroker != NULL) {
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FT_Done_Glyph(glyph);
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}
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if (bitmap_converted_ready) {
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FT_Bitmap_Done(library, &bitmap_converted);
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}
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FT_Stroker_Done(stroker);
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PyMem_Del(glyph_info);
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return NULL;
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}
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#if FREETYPE_MAJOR > 2 ||\
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