Augment tinyjpeg so that we can decode straight into the buffer;

clear the screen on startup.

1 files changed, 10 insertions, 7 deletions

diff --git a/com32/lib/jpeg/rgba32.c b/com32/lib/jpeg/rgba32.c
index 2934bcd8..2ad91125 100644
--- a/com32/lib/jpeg/rgba32.c
+++ b/com32/lib/jpeg/rgba32.c
@@ -84,7 +84,7 @@ static void YCrCB_to_RGBA32_1x1(struct jdec_private *priv)
   Y = priv->Y;
   Cb = priv->Cb;
   Cr = priv->Cr;
-  offset_to_next_row = priv->width*4 - 8*4;
+  offset_to_next_row = priv->bytes_per_row[0] - 8*4;
   for (i=0; i<8; i++) {
 
     for (j=0;j<8;j++) {
@@ -140,7 +140,7 @@ static void YCrCB_to_RGBA32_2x1(struct jdec_private *priv)
   Y = priv->Y;
   Cb = priv->Cb;
   Cr = priv->Cr;
-  offset_to_next_row = priv->width*4 - 16*4;
+  offset_to_next_row = priv->bytes_per_row[0] - 16*4;
   for (i=0; i<8; i++) {
 
     for (j=0; j<8; j++) {
@@ -206,11 +206,11 @@ static void YCrCB_to_RGBA32_1x2(struct jdec_private *priv)
 #define FIX(x)          ((int)((x) * (1UL<<SCALEBITS) + 0.5))
 
   p = priv->plane[0];
-  p2 = priv->plane[0] + priv->width*4;
+  p2 = priv->plane[0] + priv->bytes_per_row[0];
   Y = priv->Y;
   Cb = priv->Cb;
   Cr = priv->Cr;
-  offset_to_next_row = 2*priv->width*4 - 8*4;
+  offset_to_next_row = 2*priv->bytes_per_row[0] - 8*4;
   for (i=0; i<8; i++) {
 
     for (j=0; j<8; j++) {
@@ -277,11 +277,11 @@ static void YCrCB_to_RGBA32_2x2(struct jdec_private *priv)
 #define FIX(x)          ((int)((x) * (1UL<<SCALEBITS) + 0.5))
 
   p = priv->plane[0];
-  p2 = priv->plane[0] + priv->width*4;
+  p2 = priv->plane[0] + priv->bytes_per_row[0];
   Y = priv->Y;
   Cb = priv->Cb;
   Cr = priv->Cr;
-  offset_to_next_row = (priv->width*4*2) - 16*4;
+  offset_to_next_row = 2*priv->bytes_per_row[0] - 16*4;
   for (i=0; i<8; i++) {
 
     for (j=0;j<8;j++) {
@@ -353,7 +353,10 @@ static int initialize_rgba32(struct jdec_private *priv,
 {
   if (priv->components[0] == NULL)
     priv->components[0] = (uint8_t *)malloc(priv->width * priv->height * 4);
-  bytes_per_blocklines[0] = priv->width * 4;
+  if (!priv->bytes_per_row[0])
+    priv->bytes_per_row[0] = priv->width * 4;
+
+  bytes_per_blocklines[0] = priv->bytes_per_row[0];
   bytes_per_mcu[0] = 4*8;
 
   return !priv->components[0];