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Checking for half_image_size[ x & y ] to be non-negative.

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This make sure that (1x1) , (1 x X) and (X , 1) pixel images using sub-sampling will get correct half_image_size i.e NON-NEGATIVE.
fix : https://github.com/godotengine/godot/issues/42363

(cherry picked from commit ec6a4c92fe)
This commit is contained in:
Pun1sher 2020-11-10 21:23:08 +05:30 committed by Rémi Verschelde
parent d6c67d0521
commit 1958a5b35e
1 changed files with 4 additions and 4 deletions
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8
thirdparty/jpeg-compressor/jpgd.cpp vendored
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@ -1669,7 +1669,7 @@ namespace jpgd {
int row = m_max_mcu_y_size - m_mcu_lines_left;
uint8* d0 = m_pScan_line_0;
const int half_image_x_size = (m_image_x_size >> 1) - 1;
const int half_image_x_size = (m_image_x_size == 1) ? 0 : (m_image_x_size >> 1) - 1;
const int row_x8 = row * 8;
for (int x = 0; x < m_image_x_size; x++)
@ -1762,7 +1762,7 @@ namespace jpgd {
int y = m_image_y_size - m_total_lines_left;
int row = y & 15;
const int half_image_y_size = (m_image_y_size >> 1) - 1;
const int half_image_y_size = (m_image_y_size == 1) ? 0 : (m_image_y_size >> 1) - 1;
uint8* d0 = m_pScan_line_0;
@ -1891,7 +1891,7 @@ namespace jpgd {
int y = m_image_y_size - m_total_lines_left;
int row = y & 15;
const int half_image_y_size = (m_image_y_size >> 1) - 1;
const int half_image_y_size = (m_image_y_size == 1) ? 0 : (m_image_y_size >> 1) - 1;
uint8* d0 = m_pScan_line_0;
@ -1915,7 +1915,7 @@ namespace jpgd {
const int y0_base = (c_y0 & 7) * 8 + 256;
const int y1_base = (c_y1 & 7) * 8 + 256;
const int half_image_x_size = (m_image_x_size >> 1) - 1;
const int half_image_x_size = (m_image_x_size == 1) ? 0 : (m_image_x_size >> 1) - 1;
static const uint8_t s_muls[2][2][4] =
{