gsdx-ogl: update Save() to use committed size of texture

plugins/GSdx/Renderers/OpenGL/GSTextureOGL.cpp

@@ -536,8 +536,8 @@ void GSTextureOGL::CommitPages(const GSVector2i& region, bool commit)
 bool GSTextureOGL::Save(const std::string& fn)
 {
 	// Collect the texture data
-	uint32 pitch = 4 * m_size.x;
-	uint32 buf_size = pitch * m_size.y * 2;// Note *2 for security (depth/stencil)
+	uint32 pitch = 4 * m_committed_size.x;
+	uint32 buf_size = pitch * m_committed_size.y * 2;// Note *2 for security (depth/stencil)
 	std::unique_ptr<uint8[]> image(new uint8[buf_size]);
 #ifdef ENABLE_OGL_DEBUG
 	GSPng::Format fmt = GSPng::RGB_A_PNG;
@@ -546,17 +546,19 @@ bool GSTextureOGL::Save(const std::string& fn)
 #endif
 
 	if (IsBackbuffer()) {
-		glReadPixels(0, 0, m_size.x, m_size.y, GL_RGBA, GL_UNSIGNED_BYTE, image.get());
+		glReadPixels(0, 0, m_committed_size.x, m_committed_size.y, GL_RGBA, GL_UNSIGNED_BYTE, image.get());
 	} else if(IsDss()) {
 		glBindFramebuffer(GL_READ_FRAMEBUFFER, m_fbo_read);
 
 		glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_texture_id, 0);
-		glReadPixels(0, 0, m_size.x, m_size.y, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, image.get());
+		glReadPixels(0, 0, m_committed_size.x, m_committed_size.y, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, image.get());
 
 		glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 
 		fmt = GSPng::RGB_A_PNG;
 	} else if(m_format == GL_R32I) {
+		// Note: 4.5 function used for accurate DATE
+		// barely used outside of dev and not sparse anyway
 		glGetTextureImage(m_texture_id, 0, GL_RED_INTEGER, GL_INT, buf_size, image.get());
 
 		fmt = GSPng::R32I_PNG;
@@ -566,24 +568,24 @@ bool GSTextureOGL::Save(const std::string& fn)
 		glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture_id, 0);
 
 		if (m_format == GL_RGBA8) {
-			glReadPixels(0, 0, m_size.x, m_size.y, GL_RGBA, GL_UNSIGNED_BYTE, image.get());
+			glReadPixels(0, 0, m_committed_size.x, m_committed_size.y, GL_RGBA, GL_UNSIGNED_BYTE, image.get());
 		}
 		else if (m_format == GL_R16UI)
 		{
-			glReadPixels(0, 0, m_size.x, m_size.y, GL_RED_INTEGER, GL_UNSIGNED_SHORT, image.get());
+			glReadPixels(0, 0, m_committed_size.x, m_committed_size.y, GL_RED_INTEGER, GL_UNSIGNED_SHORT, image.get());
 			fmt = GSPng::R16I_PNG;
 		}
 		else if (m_format == GL_R8)
 		{
 			fmt = GSPng::R8I_PNG;
-			glReadPixels(0, 0, m_size.x, m_size.y, GL_RED, GL_UNSIGNED_BYTE, image.get());
+			glReadPixels(0, 0, m_committed_size.x, m_committed_size.y, GL_RED, GL_UNSIGNED_BYTE, image.get());
 		}
 
 		glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 	}
 
 	int compression = theApp.GetConfigI("png_compression_level");
-	return GSPng::Save(fmt, fn, image.get(), m_size.x, m_size.y, pitch, compression);
+	return GSPng::Save(fmt, fn, image.get(), m_committed_size.x, m_committed_size.y, pitch, compression);
 }
 
 uint32 GSTextureOGL::GetMemUsage()