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No commits in common. "c8" and "c8-beta" have entirely different histories.
@ -1,69 +0,0 @@
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diff --git a/pngrtran.c b/pngrtran.c
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index 548780030a..2f52022551 100644
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--- a/pngrtran.c
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+++ b/pngrtran.c
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@@ -1781,19 +1781,51 @@ png_init_read_transformations(png_structrp png_ptr)
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}
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else /* if (png_ptr->trans_alpha[i] != 0xff) */
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{
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- png_byte v, w;
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-
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- v = png_ptr->gamma_to_1[palette[i].red];
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- png_composite(w, v, png_ptr->trans_alpha[i], back_1.red);
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- palette[i].red = png_ptr->gamma_from_1[w];
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-
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- v = png_ptr->gamma_to_1[palette[i].green];
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- png_composite(w, v, png_ptr->trans_alpha[i], back_1.green);
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- palette[i].green = png_ptr->gamma_from_1[w];
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-
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- v = png_ptr->gamma_to_1[palette[i].blue];
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- png_composite(w, v, png_ptr->trans_alpha[i], back_1.blue);
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- palette[i].blue = png_ptr->gamma_from_1[w];
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+ if ((png_ptr->flags & PNG_FLAG_OPTIMIZE_ALPHA) != 0)
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+ {
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+ /* Premultiply only:
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+ * component = round((component * alpha) / 255)
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+ */
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+ png_uint_32 component;
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+
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+ component = png_ptr->gamma_to_1[palette[i].red];
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+ component =
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+ (component * png_ptr->trans_alpha[i] + 128) / 255;
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+ palette[i].red = png_ptr->gamma_from_1[component];
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+
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+ component = png_ptr->gamma_to_1[palette[i].green];
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+ component =
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+ (component * png_ptr->trans_alpha[i] + 128) / 255;
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+ palette[i].green = png_ptr->gamma_from_1[component];
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+
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+ component = png_ptr->gamma_to_1[palette[i].blue];
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+ component =
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+ (component * png_ptr->trans_alpha[i] + 128) / 255;
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+ palette[i].blue = png_ptr->gamma_from_1[component];
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+ }
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+ else
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+ {
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+ /* Composite with background color:
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+ * component =
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+ * alpha * component + (1 - alpha) * background
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+ */
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+ png_byte v, w;
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+
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+ v = png_ptr->gamma_to_1[palette[i].red];
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+ png_composite(w, v,
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+ png_ptr->trans_alpha[i], back_1.red);
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+ palette[i].red = png_ptr->gamma_from_1[w];
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+
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+ v = png_ptr->gamma_to_1[palette[i].green];
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+ png_composite(w, v,
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+ png_ptr->trans_alpha[i], back_1.green);
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+ palette[i].green = png_ptr->gamma_from_1[w];
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+
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+ v = png_ptr->gamma_to_1[palette[i].blue];
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+ png_composite(w, v,
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+ png_ptr->trans_alpha[i], back_1.blue);
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+ palette[i].blue = png_ptr->gamma_from_1[w];
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+ }
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}
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}
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else
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@ -1,25 +0,0 @@
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diff --git a/pngread.c b/pngread.c
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index 212afb7d21..92571ec335 100644
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--- a/pngread.c
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+++ b/pngread.c
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@@ -4040,6 +4040,20 @@ png_image_finish_read(png_imagep image, png_const_colorp background,
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int result;
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png_image_read_control display;
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+ /* Reject bit depth mismatches to avoid buffer overflows. */
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+ png_uint_32 ihdr_bit_depth =
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+ image->opaque->png_ptr->bit_depth;
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+ int requested_linear =
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+ (image->format & PNG_FORMAT_FLAG_LINEAR) != 0;
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+ if (ihdr_bit_depth == 16 && !requested_linear)
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+ return png_image_error(image,
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+ "png_image_finish_read: "
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+ "16-bit PNG must use 16-bit output format");
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+ if (ihdr_bit_depth < 16 && requested_linear)
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+ return png_image_error(image,
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+ "png_image_finish_read: "
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+ "8-bit PNG must not use 16-bit output format");
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+
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memset(&display, 0, (sizeof display));
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display.image = image;
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display.buffer = buffer;
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@ -1,130 +0,0 @@
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diff --git a/pngread.c b/pngread.c
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index 92571ec335..79917daaaf 100644
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--- a/pngread.c
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+++ b/pngread.c
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@@ -3129,6 +3129,54 @@ png_image_read_colormapped(png_voidp argument)
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}
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}
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+/* Row reading for interlaced 16-to-8 bit depth conversion with local buffer. */
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+static int
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+png_image_read_direct_scaled(png_voidp argument)
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+{
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+ png_image_read_control *display = png_voidcast(png_image_read_control*,
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+ argument);
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+ png_imagep image = display->image;
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+ png_structrp png_ptr = image->opaque->png_ptr;
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+ png_bytep local_row = png_voidcast(png_bytep, display->local_row);
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+ png_bytep first_row = png_voidcast(png_bytep, display->first_row);
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+ ptrdiff_t row_bytes = display->row_bytes;
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+ int passes;
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+
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+ /* Handle interlacing. */
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+ switch (png_ptr->interlaced)
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+ {
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+ case PNG_INTERLACE_NONE:
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+ passes = 1;
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+ break;
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+
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+ case PNG_INTERLACE_ADAM7:
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+ passes = PNG_INTERLACE_ADAM7_PASSES;
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+ break;
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+
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+ default:
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+ png_error(png_ptr, "unknown interlace type");
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+ }
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+
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+ /* Read each pass using local_row as intermediate buffer. */
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+ while (--passes >= 0)
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+ {
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+ png_uint_32 y = image->height;
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+ png_bytep output_row = first_row;
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+
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+ for (; y > 0; --y)
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+ {
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+ /* Read into local_row (gets transformed 8-bit data). */
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+ png_read_row(png_ptr, local_row, NULL);
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+
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+ /* Copy from local_row to user buffer. */
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+ memcpy(output_row, local_row, (size_t)row_bytes);
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+ output_row += row_bytes;
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+ }
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+ }
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+
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+ return 1;
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+}
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+
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/* Just the row reading part of png_image_read. */
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static int
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png_image_read_composite(png_voidp argument)
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@@ -3547,6 +3595,7 @@ png_image_read_direct(png_voidp argument)
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int linear = (format & PNG_FORMAT_FLAG_LINEAR) != 0;
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int do_local_compose = 0;
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int do_local_background = 0; /* to avoid double gamma correction bug */
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+ int do_local_scale = 0; /* for interlaced 16-to-8 bit conversion */
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int passes = 0;
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/* Add transforms to ensure the correct output format is produced then check
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@@ -3680,8 +3729,16 @@ png_image_read_direct(png_voidp argument)
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png_set_expand_16(png_ptr);
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else /* 8-bit output */
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+ {
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png_set_scale_16(png_ptr);
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+ /* For interlaced images, use local_row buffer to avoid overflow
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+ * in png_combine_row() which writes using IHDR bit-depth.
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+ */
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+ if (png_ptr->interlaced != 0)
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+ do_local_scale = 1;
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+ }
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+
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change &= ~PNG_FORMAT_FLAG_LINEAR;
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}
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@@ -3957,6 +4014,24 @@ png_image_read_direct(png_voidp argument)
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return result;
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}
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+ else if (do_local_scale != 0)
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+ {
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+ /* For interlaced 16-to-8 conversion, use an intermediate row buffer
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+ * to avoid buffer overflows in png_combine_row. The local_row is sized
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+ * for the transformed (8-bit) output, preventing the overflow that would
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+ * occur if png_combine_row wrote 16-bit data directly to the user buffer.
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+ */
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+ int result;
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+ png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr));
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+
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+ display->local_row = row;
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+ result = png_safe_execute(image, png_image_read_direct_scaled, display);
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+ display->local_row = NULL;
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+ png_free(png_ptr, row);
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+
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+ return result;
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+ }
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+
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else
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{
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png_alloc_size_t row_bytes = (png_alloc_size_t)display->row_bytes;
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@@ -4040,20 +4115,6 @@ png_image_finish_read(png_imagep image, png_const_colorp background,
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int result;
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png_image_read_control display;
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- /* Reject bit depth mismatches to avoid buffer overflows. */
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- png_uint_32 ihdr_bit_depth =
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- image->opaque->png_ptr->bit_depth;
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- int requested_linear =
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- (image->format & PNG_FORMAT_FLAG_LINEAR) != 0;
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- if (ihdr_bit_depth == 16 && !requested_linear)
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- return png_image_error(image,
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- "png_image_finish_read: "
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- "16-bit PNG must use 16-bit output format");
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- if (ihdr_bit_depth < 16 && requested_linear)
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- return png_image_error(image,
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- "png_image_finish_read: "
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- "8-bit PNG must not use 16-bit output format");
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-
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memset(&display, 0, (sizeof display));
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display.image = image;
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display.buffer = buffer;
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@ -1,21 +0,0 @@
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diff --git a/pngread.c b/pngread.c
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index 79917daaaf..ab62edd9d8 100644
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--- a/pngread.c
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+++ b/pngread.c
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@@ -3273,9 +3273,14 @@ png_image_read_composite(png_voidp argument)
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component += (255-alpha)*png_sRGB_table[outrow[c]];
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/* So 'component' is scaled by 255*65535 and is
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- * therefore appropriate for the sRGB to linear
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- * conversion table.
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+ * therefore appropriate for the sRGB-to-linear
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+ * conversion table. Clamp to the valid range
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+ * as a defensive measure against an internal
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+ * libpng bug where the data is sRGB rather than
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+ * linear premultiplied.
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*/
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+ if (component > 255*65535)
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+ component = 255*65535;
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component = PNG_sRGB_FROM_LINEAR(component);
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}
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@ -1,88 +0,0 @@
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diff --git a/pngread.c b/pngread.c
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index ab62edd9d8..f8ca2b7e31 100644
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--- a/pngread.c
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+++ b/pngread.c
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@@ -3207,6 +3207,7 @@ png_image_read_composite(png_voidp argument)
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ptrdiff_t step_row = display->row_bytes;
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unsigned int channels =
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(image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
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+ int optimize_alpha = (png_ptr->flags & PNG_FLAG_OPTIMIZE_ALPHA) != 0;
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int pass;
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for (pass = 0; pass < passes; ++pass)
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@@ -3263,25 +3264,44 @@ png_image_read_composite(png_voidp argument)
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if (alpha < 255) /* else just use component */
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{
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- /* This is PNG_OPTIMIZED_ALPHA, the component value
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- * is a linear 8-bit value. Combine this with the
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- * current outrow[c] value which is sRGB encoded.
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- * Arithmetic here is 16-bits to preserve the output
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- * values correctly.
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- */
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- component *= 257*255; /* =65535 */
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- component += (255-alpha)*png_sRGB_table[outrow[c]];
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-
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- /* So 'component' is scaled by 255*65535 and is
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- * therefore appropriate for the sRGB-to-linear
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- * conversion table. Clamp to the valid range
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- * as a defensive measure against an internal
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- * libpng bug where the data is sRGB rather than
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- * linear premultiplied.
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- */
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- if (component > 255*65535)
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- component = 255*65535;
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- component = PNG_sRGB_FROM_LINEAR(component);
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+ if (optimize_alpha != 0)
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+ {
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+ /* This is PNG_OPTIMIZED_ALPHA, the component value
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+ * is a linear 8-bit value. Combine this with the
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+ * current outrow[c] value which is sRGB encoded.
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+ * Arithmetic here is 16-bits to preserve the output
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+ * values correctly.
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+ */
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+ component *= 257*255; /* =65535 */
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+ component += (255-alpha)*png_sRGB_table[outrow[c]];
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+
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+ /* Clamp to the valid range to defend against
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+ * unforeseen cases where the data might be sRGB
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+ * instead of linear premultiplied.
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+ * (Belt-and-suspenders for GitHub Issue #764.)
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+ */
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+ if (component > 255*65535)
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+ component = 255*65535;
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+
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+ /* So 'component' is scaled by 255*65535 and is
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+ * therefore appropriate for the sRGB-to-linear
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+ * conversion table.
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+ */
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+ component = PNG_sRGB_FROM_LINEAR(component);
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+ }
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+ else
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+ {
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+ /* Compositing was already done on the palette
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+ * entries. The data is sRGB premultiplied on black.
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+ * Composite with the background in sRGB space.
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+ * This is not gamma-correct, but matches what was
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+ * done to the palette.
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+ */
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+ png_uint_32 background = outrow[c];
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+ component += ((255-alpha) * background + 127) / 255;
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+ if (component > 255)
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+ component = 255;
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+ }
|
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}
|
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outrow[c] = (png_byte)component;
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diff --git a/pngrtran.c b/pngrtran.c
|
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index 2f52022551..507d11381e 100644
|
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--- a/pngrtran.c
|
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+++ b/pngrtran.c
|
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@@ -1843,6 +1843,7 @@ png_init_read_transformations(png_structrp png_ptr)
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* transformations elsewhere.
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*/
|
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png_ptr->transformations &= ~(PNG_COMPOSE | PNG_GAMMA);
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+ png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
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} /* color_type == PNG_COLOR_TYPE_PALETTE */
|
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|
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/* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
|
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@ -1,25 +0,0 @@
|
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diff --git a/pngread.c b/pngread.c
|
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index e3426292b1..9d86b01dc0 100644
|
||||
--- a/pngread.c
|
||||
+++ b/pngread.c
|
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@@ -3138,9 +3138,11 @@ png_image_read_direct_scaled(png_voidp argument)
|
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argument);
|
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png_imagep image = display->image;
|
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png_structrp png_ptr = image->opaque->png_ptr;
|
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+ png_inforp info_ptr = image->opaque->info_ptr;
|
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png_bytep local_row = png_voidcast(png_bytep, display->local_row);
|
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png_bytep first_row = png_voidcast(png_bytep, display->first_row);
|
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ptrdiff_t row_bytes = display->row_bytes;
|
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+ size_t copy_bytes = png_get_rowbytes(png_ptr, info_ptr);
|
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int passes;
|
||||
|
||||
/* Handle interlacing. */
|
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@@ -3170,7 +3172,7 @@ png_image_read_direct_scaled(png_voidp argument)
|
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png_read_row(png_ptr, local_row, NULL);
|
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|
||||
/* Copy from local_row to user buffer. */
|
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- memcpy(output_row, local_row, (size_t)row_bytes);
|
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+ memcpy(output_row, local_row, copy_bytes);
|
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output_row += row_bytes;
|
||||
}
|
||||
}
|
||||
@ -1,38 +0,0 @@
|
||||
diff --git a/pngwrite.c b/pngwrite.c
|
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index 08066bcc42..a95b846c8e 100644
|
||||
@@ -1678,7 +1678,7 @@ png_write_image_16bit(png_voidp argument)
|
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}
|
||||
|
||||
png_write_row(png_ptr, png_voidcast(png_const_bytep, display->local_row));
|
||||
- input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
|
||||
+ input_row += display->row_bytes / 2;
|
||||
}
|
||||
|
||||
return 1;
|
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@@ -1804,7 +1804,7 @@ png_write_image_8bit(png_voidp argument)
|
||||
|
||||
png_write_row(png_ptr, png_voidcast(png_const_bytep,
|
||||
display->local_row));
|
||||
- input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
|
||||
+ input_row += display->row_bytes / 2;
|
||||
} /* while y */
|
||||
}
|
||||
|
||||
@@ -1829,7 +1829,7 @@ png_write_image_8bit(png_voidp argument)
|
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}
|
||||
|
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png_write_row(png_ptr, output_row);
|
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- input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
|
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+ input_row += display->row_bytes / 2;
|
||||
}
|
||||
}
|
||||
|
||||
@@ -2148,7 +2148,7 @@ png_image_write_main(png_voidp argument)
|
||||
ptrdiff_t row_bytes = display->row_stride;
|
||||
|
||||
if (linear != 0)
|
||||
- row_bytes *= (sizeof (png_uint_16));
|
||||
+ row_bytes *= 2;
|
||||
|
||||
if (row_bytes < 0)
|
||||
row += (image->height-1) * (-row_bytes);
|
||||
@ -1,15 +0,0 @@
|
||||
diff --git a/pngrtran.c b/pngrtran.c
|
||||
index fe8f9d32c9..1fce9af121 100644
|
||||
--- a/pngrtran.c
|
||||
+++ b/pngrtran.c
|
||||
@@ -708,8 +708,8 @@ png_set_quantize(png_structrp png_ptr, png_colorp palette,
|
||||
break;
|
||||
|
||||
t->next = hash[d];
|
||||
- t->left = (png_byte)i;
|
||||
- t->right = (png_byte)j;
|
||||
+ t->left = png_ptr->palette_to_index[i];
|
||||
+ t->right = png_ptr->palette_to_index[j];
|
||||
hash[d] = t;
|
||||
}
|
||||
}
|
||||
@ -2,7 +2,7 @@ Summary: A library of functions for manipulating PNG image format files
|
||||
Name: libpng
|
||||
Epoch: 2
|
||||
Version: 1.6.34
|
||||
Release: 10%{?dist}
|
||||
Release: 5%{?dist}
|
||||
License: zlib
|
||||
Group: System Environment/Libraries
|
||||
URL: http://www.libpng.org/pub/png/
|
||||
@ -15,28 +15,7 @@ Patch0: libpng-multilib.patch
|
||||
Patch1: libpng-fix-arm-neon.patch
|
||||
Patch2: libpng-CVE-2018-13785.patch
|
||||
Patch3: libpng-coverity.patch
|
||||
# from upstream, for <1.6.51, RHEL-131422
|
||||
# https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643
|
||||
Patch4: libpng-1.6-CVE-2025-64720.patch
|
||||
# from upstream, for <1.6.51, RHEL-131435
|
||||
# https://github.com/pnggroup/libpng/commit/16b5e3823918840aae65c0a6da57c78a5a496a4d
|
||||
Patch5: libpng-1.6-CVE-2025-65018_p1of2.patch
|
||||
# https://github.com/pnggroup/libpng/commit/218612ddd6b17944e21eda56caf8b4bf7779d1ea
|
||||
Patch6: libpng-1.6-CVE-2025-65018_p2of2.patch
|
||||
# from upstream, for <1.6.52, RHEL-133212
|
||||
# https://github.com/pnggroup/libpng/commit/788a624d7387a758ffd5c7ab010f1870dea753a1
|
||||
Patch7: libpng-1.6-CVE-2025-66293_p1of2.patch
|
||||
# https://github.com/pnggroup/libpng/commit/a05a48b756de63e3234ea6b3b938b8f5f862484a
|
||||
Patch8: libpng-1.6-CVE-2025-66293_p2of2.patch
|
||||
# from upstream, for <1.6.54, RHEL-148852
|
||||
# https://github.com/pnggroup/libpng/commit/e4f7ad4ea2
|
||||
Patch9: libpng-1.6-cve-2026-22695.patch
|
||||
# from upstream, for <1.6.54, RHEL-146659
|
||||
# https://github.com/pnggroup/libpng/commit/cf155de014fc6c5cb199dd681dd5c8fb70429072
|
||||
Patch10: libpng-1.6-cve-2026-22801.patch
|
||||
# from upstream, for <1.6.55, RHEL-148338
|
||||
# https://github.com/pnggroup/libpng/commit/01d03b8453eb30ade759cd45c707e5a1c7277d88
|
||||
Patch11: libpng-1.6-cve-2026-25646.patch
|
||||
|
||||
|
||||
BuildRequires: zlib-devel
|
||||
BuildRequires: autoconf automake libtool
|
||||
@ -88,18 +67,10 @@ The libpng-tools package contains tools used by the authors of libpng.
|
||||
# Provide pngusr.dfa for build.
|
||||
cp -p %{SOURCE1} .
|
||||
|
||||
%patch -P 0 -p1
|
||||
%patch -P 1 -p1 -b .arm
|
||||
%patch -P 2 -p1 -b .CVE-2018-13785
|
||||
%patch -P 3 -p1 -b .coverity
|
||||
%patch -P 4 -p1 -b .CVE-2025-64720
|
||||
%patch -P 5 -p1 -b .CVE-2025-65018_p1of2
|
||||
%patch -P 6 -p1 -b .CVE-2025-65018_p2of2
|
||||
%patch -P 7 -p1 -b .CVE-2025-66293_p1of2
|
||||
%patch -P 8 -p1 -b .CVE-2025-66293_p2of2
|
||||
%patch -P 9 -p1 -b .cve-2026-22695
|
||||
%patch -P 10 -p1 -b .cve-2026-22801
|
||||
%patch -P 11 -p1 -b .cve-2026-25646
|
||||
%patch0 -p1
|
||||
%patch1 -p1 -b .arm
|
||||
%patch2 -p1 -b .CVE-2018-13785
|
||||
%patch3 -p1 -b .coverity
|
||||
|
||||
%build
|
||||
autoreconf -vif
|
||||
@ -141,25 +112,6 @@ make check
|
||||
%{_bindir}/pngfix
|
||||
|
||||
%changelog
|
||||
* Thu Mar 05 2026 Michal Hlavinka <mhlavink@redhat.com> - 2:1.6.34-10
|
||||
- fix CVE-2026-25646: heap buffer overflow in png_set_quantize (RHEL-148338)
|
||||
- fix CVE-2026-22695: heap buffer over-read in png_image_finish_read (RHEL-148852)
|
||||
- fix CVE-2026-22801: heap buffer over-read in png_image_write_*bit (RHEL-146659)
|
||||
|
||||
* Tue Dec 16 2025 Michal Hlavinka <mhlavink@redhat.com> - 2:1.6.34-9
|
||||
- CVE-2025-64720: buffer overflow (RHEL-131452)
|
||||
- CVE-2025-65018: heap buffer overflow (RHEL-131465)
|
||||
- CVE-2025-66293: out-of-bounds read in png_image_read_composite (RHEL-133226)
|
||||
|
||||
* Thu Nov 28 2019 Nikola Forró <nforro@redhat.com> - 2:1.6.34-8
|
||||
- Remove redundant fix for CVE-2017-12652
|
||||
|
||||
* Tue Nov 26 2019 Nikola Forró <nforro@redhat.com> - 2:1.6.34-7
|
||||
- Add upstream test suite and enable it in gating
|
||||
|
||||
* Fri Nov 22 2019 Nikola Forró <nforro@redhat.com> - 2:1.6.34-6
|
||||
- Fix CVE-2017-12652 (#1744871)
|
||||
|
||||
* Mon Oct 15 2018 Nikola Forró <nforro@redhat.com> - 2:1.6.34-5
|
||||
- Fix important Covscan defects (#1602588)
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user