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On bad blend strings, print the error if not returning it

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It's very common that there's no reasonable fallback to do if the
blend or combine string you set isn't supported. So, rather than
requiring everybody to pass in a GError purely to catch syntax erorrs,
automatically g_warning() if a parse error is encountered and @error
is NULL.

http://bugzilla.openedhand.com/show_bug.cgi?id=1642

Signed-off-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Owen W. Taylor 2009-06-08 09:26:57 -04:00 committed by Robert Bragg
parent d873a57ec9
commit 08d580f68a
2 changed files with 30 additions and 5 deletions
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5
clutter/cogl/cogl-material.h
View File

@ -419,7 +419,8 @@ void cogl_material_set_alpha_test_function (CoglHandle material,
* @error: A GError that may report lack of driver support if you give
* separate blend string statements for the alpha channel and RGB
* channels since some drivers or backends such as GLES 1.1 dont
* support this.
* support this. May be %NULL, in which case a warning will be
* printed out if an error is encountered.
*
* If not already familiar; please refer
* <link linkend="cogl-Blend-Strings">here</link> for an overview of what blend
@ -536,6 +537,8 @@ void cogl_material_remove_layer (CoglHandle material,
* @blend_string: A <link linkend="cogl-Blend-Strings">Cogl blend string</link>
* describing the desired texture combine function.
* @error: A GError that may report parse errors or lack of GPU/driver support.
* May be %NULL, in which case a warning will be printed out if an
* error is encountered.
*
* If not already familiar; you can refer
* <link linkend="cogl-Blend-Strings">here</link> for an overview of what blend

30
clutter/cogl/common/cogl-material.c
View File

@ -533,6 +533,7 @@ cogl_material_set_blend (CoglHandle handle,
CoglBlendStringStatement split[2];
CoglBlendStringStatement *rgb;
CoglBlendStringStatement *a;
GError *internal_error = NULL;
int count;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
@ -543,9 +544,19 @@ cogl_material_set_blend (CoglHandle handle,
_cogl_blend_string_compile (blend_description,
COGL_BLEND_STRING_CONTEXT_BLENDING,
statements,
error);
&internal_error);
if (!count)
return FALSE;
{
if (error)
g_propagate_error (error, internal_error);
else
{
g_warning ("Cannot compile blend description: %s\n",
internal_error->message);
g_error_free (internal_error);
}
return FALSE;
}
if (statements[0].mask == COGL_BLEND_STRING_CHANNEL_MASK_RGBA)
{
@ -806,6 +817,7 @@ cogl_material_set_layer_combine (CoglHandle handle,
CoglBlendStringStatement split[2];
CoglBlendStringStatement *rgb;
CoglBlendStringStatement *a;
GError *internal_error = NULL;
int count;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
@ -817,9 +829,19 @@ cogl_material_set_layer_combine (CoglHandle handle,
_cogl_blend_string_compile (combine_description,
COGL_BLEND_STRING_CONTEXT_TEXTURE_COMBINE,
statements,
error);
&internal_error);
if (!count)
return FALSE;
{
if (error)
g_propagate_error (error, internal_error);
else
{
g_warning ("Cannot compile combine description: %s\n",
internal_error->message);
g_error_free (internal_error);
}
return FALSE;
}
if (statements[0].mask == COGL_BLEND_STRING_CHANNEL_MASK_RGBA)
{