mirror of
https://github.com/python-pillow/Pillow.git
synced 2025-01-28 02:04:36 +03:00
Do not raise error if bitmap buffer is empty
This commit is contained in:
Andrew Murray
parent
d6cfebd016
commit
f9f7ba4ce9
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@ -1,10 +1,8 @@
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from __future__ import annotations
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import pytest
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from PIL import Image, ImageDraw, ImageFont
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from .helper import skip_unless_feature
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from .helper import skip_unless_feature_version
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class TestFontCrash:
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@ -17,8 +15,7 @@ class TestFontCrash:
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draw.multiline_textbbox((10, 10), "ABC\nAaaa", font, stroke_width=2)
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draw.text((10, 10), "Test Text", font=font, fill="#000")
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@skip_unless_feature("freetype2")
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@skip_unless_feature_version("freetype2", "2.12.0")
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def test_segfault(self) -> None:
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with pytest.raises(OSError):
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font = ImageFont.truetype("Tests/fonts/fuzz_font-5203009437302784")
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self._fuzz_font(font)
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font = ImageFont.truetype("Tests/fonts/fuzz_font-5203009437302784")
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self._fuzz_font(font)
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266
src/_imagingft.c
266
src/_imagingft.c
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@ -1025,130 +1025,99 @@ font_render(FontObject *self, PyObject *args) {
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yy = -(py + glyph_slot->bitmap_top);
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}
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// Null buffer, is dereferenced in FT_Bitmap_Convert
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if (!bitmap.buffer && bitmap.rows) {
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PyErr_SetString(PyExc_OSError, "Bitmap missing for glyph");
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goto glyph_error;
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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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case FT_PIXEL_MODE_BGRA:
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if (color) {
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if (bitmap.buffer) {
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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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}
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/* we didn't ask for color, fall through to default */
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default:
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PyErr_SetString(PyExc_OSError, "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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if (xx < 0) {
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x0 = -xx;
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}
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if (xx + x1 > im->xsize) {
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x1 = im->xsize - xx;
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}
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source = (unsigned char *)bitmap.buffer;
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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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int k;
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unsigned char *target;
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unsigned int tmp;
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if (color) {
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/* target[RGB] returns the color, target[A] returns the mask */
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/* target bands get split again in ImageDraw.text */
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target = (unsigned char *)im->image[yy] + xx * 4;
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} else {
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target = im->image8[yy] + xx;
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}
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if (color && bitmap.pixel_mode == FT_PIXEL_MODE_BGRA) {
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/* paste color glyph */
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for (k = x0; k < x1; k++) {
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unsigned int src_alpha = source[k * 4 + 3];
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/* paste only if source has data */
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if (src_alpha > 0) {
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/* unpremultiply BGRa */
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int src_red =
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CLIP8((255 * (int)source[k * 4 + 2]) / src_alpha);
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int src_green =
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CLIP8((255 * (int)source[k * 4 + 1]) / src_alpha);
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int src_blue =
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CLIP8((255 * (int)source[k * 4 + 0]) / src_alpha);
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/* blend required if target has data */
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if (target[k * 4 + 3] > 0) {
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/* blend RGBA colors */
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target[k * 4 + 0] =
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BLEND(src_alpha, target[k * 4 + 0], src_red, tmp);
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target[k * 4 + 1] =
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BLEND(src_alpha, target[k * 4 + 1], src_green, tmp);
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target[k * 4 + 2] =
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BLEND(src_alpha, target[k * 4 + 2], src_blue, tmp);
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target[k * 4 + 3] = CLIP8(
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src_alpha +
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MULDIV255(target[k * 4 + 3], (255 - src_alpha), tmp)
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);
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} else {
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/* paste unpremultiplied RGBA values */
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target[k * 4 + 0] = src_red;
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target[k * 4 + 1] = src_green;
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target[k * 4 + 2] = src_blue;
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target[k * 4 + 3] = src_alpha;
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}
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}
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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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} else if (bitmap.pixel_mode == FT_PIXEL_MODE_GRAY) {
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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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case FT_PIXEL_MODE_BGRA:
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if (color) {
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unsigned char *ink = (unsigned char *)&foreground_ink;
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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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default:
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PyErr_SetString(PyExc_OSError, "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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if (xx < 0) {
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x0 = -xx;
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}
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if (xx + x1 > im->xsize) {
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x1 = im->xsize - xx;
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}
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source = (unsigned char *)bitmap.buffer;
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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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int k;
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unsigned char *target;
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unsigned int tmp;
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if (color) {
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/* target[RGB] returns the color, target[A] returns the mask */
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/* target bands get split again in ImageDraw.text */
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target = (unsigned char *)im->image[yy] + xx * 4;
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} else {
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target = im->image8[yy] + xx;
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}
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if (color && bitmap.pixel_mode == FT_PIXEL_MODE_BGRA) {
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/* paste color glyph */
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for (k = x0; k < x1; k++) {
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unsigned int src_alpha = source[k] * convert_scale;
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unsigned int src_alpha = source[k * 4 + 3];
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/* paste only if source has data */
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if (src_alpha > 0) {
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/* unpremultiply BGRa */
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int src_red =
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CLIP8((255 * (int)source[k * 4 + 2]) / src_alpha);
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int src_green =
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CLIP8((255 * (int)source[k * 4 + 1]) / src_alpha);
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int src_blue =
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CLIP8((255 * (int)source[k * 4 + 0]) / src_alpha);
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/* blend required if target has data */
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if (target[k * 4 + 3] > 0) {
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/* blend RGBA colors */
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target[k * 4 + 0] = BLEND(
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src_alpha, target[k * 4 + 0], ink[0], tmp
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src_alpha, target[k * 4 + 0], src_red, tmp
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);
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target[k * 4 + 1] = BLEND(
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src_alpha, target[k * 4 + 1], ink[1], tmp
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src_alpha, target[k * 4 + 1], src_green, tmp
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);
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target[k * 4 + 2] = BLEND(
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src_alpha, target[k * 4 + 2], ink[2], tmp
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src_alpha, target[k * 4 + 2], src_blue, tmp
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);
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target[k * 4 + 3] = CLIP8(
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src_alpha +
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@ -1157,35 +1126,68 @@ font_render(FontObject *self, PyObject *args) {
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)
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);
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} else {
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target[k * 4 + 0] = ink[0];
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target[k * 4 + 1] = ink[1];
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target[k * 4 + 2] = ink[2];
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/* paste unpremultiplied RGBA values */
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target[k * 4 + 0] = src_red;
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target[k * 4 + 1] = src_green;
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target[k * 4 + 2] = src_blue;
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target[k * 4 + 3] = src_alpha;
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}
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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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unsigned int src_alpha = source[k] * convert_scale;
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if (src_alpha > 0) {
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target[k] =
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target[k] > 0
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? CLIP8(
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src_alpha +
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MULDIV255(
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target[k], (255 - src_alpha), tmp
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} else if (bitmap.pixel_mode == FT_PIXEL_MODE_GRAY) {
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if (color) {
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unsigned char *ink = (unsigned char *)&foreground_ink;
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for (k = x0; k < x1; k++) {
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unsigned int src_alpha = source[k] * convert_scale;
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if (src_alpha > 0) {
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if (target[k * 4 + 3] > 0) {
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target[k * 4 + 0] = BLEND(
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src_alpha, target[k * 4 + 0], ink[0], tmp
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);
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target[k * 4 + 1] = BLEND(
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src_alpha, target[k * 4 + 1], ink[1], tmp
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);
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target[k * 4 + 2] = BLEND(
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src_alpha, target[k * 4 + 2], ink[2], tmp
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);
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target[k * 4 + 3] = CLIP8(
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src_alpha + MULDIV255(
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target[k * 4 + 3],
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(255 - src_alpha),
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tmp
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)
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);
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} else {
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target[k * 4 + 0] = ink[0];
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target[k * 4 + 1] = ink[1];
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target[k * 4 + 2] = ink[2];
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target[k * 4 + 3] = src_alpha;
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}
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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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unsigned int src_alpha = source[k] * convert_scale;
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if (src_alpha > 0) {
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target[k] =
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target[k] > 0
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? CLIP8(
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src_alpha +
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MULDIV255(
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target[k], (255 - src_alpha), tmp
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)
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)
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)
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: src_alpha;
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: src_alpha;
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}
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}
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}
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} else {
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PyErr_SetString(PyExc_OSError, "unsupported bitmap pixel mode");
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goto glyph_error;
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}
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} else {
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PyErr_SetString(PyExc_OSError, "unsupported bitmap pixel mode");
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goto glyph_error;
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}
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source += bitmap.pitch;
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}
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source += bitmap.pitch;
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}
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x += glyph_info[i].x_advance;
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y += glyph_info[i].y_advance;
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